JP2014101197A - Elevator rope degradation determination method and elevator rope maintenance device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator rope degradation determination method which properly determines the degradation state of a wire rope for an elevator, and to provide an elevator rope maintenance device which minimizes the maintenance cost while securing the safety on the basis of the determination method and achieves high reliability.SOLUTION: In an elevator rope degradation determination method, a diameter of a wire rope in an elevator having a structure where a car is suspended by the wire rope is measured and a measurement value is compared with a preset threshold value. The degradation state of the wire rope is determined by the comparison result.

Description

  Embodiments of the present invention relate to an elevator rope deterioration determination method capable of determining the rope state of an elevator having a structure in which a passenger car is suspended by a wire rope, and an elevator rope maintenance apparatus using the deterioration determination method.

In an elevator having a structure in which a car is suspended by a wire rope, the wire rope is one of the basic components. It is known that the wire rope is repeatedly bent by a drive sheave or the like or subjected to friction during normal use, and thus the strength is lowered over time. Maintenance is extremely important in order to keep the strength of the wire rope appropriate, and it is necessary to confirm the extent of damage and properly grasp the remaining strength and remaining life.
The main management items of the wire rope in the elevator are defined in JIS A4302. That is, usage standards are shown for the number of wire breaks, wear dimensions, rope outer diameter, and the like, and necessary strength is ensured by maintenance replacement in accordance with the standards.

  However, in an elevator structure, the wire rope is usually routed over the entire hoistway, and it is not easy to conduct a reliable investigation within a limited maintenance time range. For this reason, a maintenance device for improving workability and reliability for each survey item has been proposed and used so far.

  For example, regarding the investigation of the damage (number of broken wires and wear) of the wire rope for an elevator, leakage magnetic flux type magnetic flaw detection has been conventionally performed for ease of handling (for example, see Non-Patent Document 1). In this system, a DC magnetic field is formed in the rope by a magnetizer such as a permanent magnet, and a magnetic flux leaking from the damaged portion to the outside of the rope is detected by a magnetic sensor using a coil or a magnetostrictive element.

  In the apparatus configuration for executing this leakage magnetic flux system, two permanent magnets (may be electromagnets) are arranged in a parallel state while maintaining an interval in reverse polarity, and one end of each of these magnets (S pole, N pole) A pole piece having a U-shaped groove is attached to each other end (N pole, S pole). Then, the wire rope to be inspected is inserted into the U-shaped grooves of the pole pieces arranged with these intervals. Further, a magnetic sensor for detecting a leakage magnetic flux from the inspection target wire rope is disposed between the magnetic pole pieces arranged at this interval.

  With this configuration, the magnetism generated from one magnet passes through the wire rope to be inspected from the magnetic pole piece, flows through the magnetic pole piece corresponding to the other magnet, and further passes through the yoke to the one magnet. Form a return magnetic path. That is, a DC magnetic field is formed in the wire rope. For this reason, when the wire rope is damaged such as a broken wire, the magnetic flux in the wire rope leaks from the damaged portion to the outside. Therefore, by detecting this leakage magnetic flux with a magnetic sensor, it is detected that the wire rope is damaged due to the broken wire. Further, the degree of damage is measured by the amount of leakage magnetic flux.

  The actual device is fixed to the elevator hoistway in a parallel state by the number of wire ropes described above so that a plurality of wire ropes used in the elevator can be deeply damaged at the same time. And the inspection operation of the elevator is carried out, and the rope is sent at a relatively low inspection speed, so that the flaw detection operation for the entire length of the rope is performed.

  By the way, in recent years, a so-called covered rope in which the outer periphery of the wire rope is coated with a resin has been proposed in order to extend the life of the wire rope and improve the driving performance (friction coefficient) (see, for example, Patent Document 1). This covering rope has a core rope made of a plurality of strands, each of which is a tensile member, and a plurality of strands arranged on the outer periphery of the core rope. The outer peripheral surface of the core rope is covered with a covering material such as a resin material, and the plurality of strands are evenly arranged on the outer peripheral surface of the core rope via the covering material described above. Further, the outer periphery of the entire rope is covered with a covering material such as a resin material so as to cover the periphery of the plurality of strands. Since many covering materials covering the outer periphery of the rope are required to ensure durability and a coefficient of friction, many of them use polyurethane resin.

  Here, the uncovered wire rope is worn and disconnected from the strands on the rope surface by directly contacting the sheave book of the elevator hoisting machine. On the other hand, in the above-mentioned resin-coated rope, the progress of damage is greatly different from the above-described wire rope without coating. That is, since the rope surface of the covered rope is covered with resin, damage to the internal structure portion of the wire rope precedes. In general, in an elevator wire rope, the strands in one strand are in line contact with each other, and the strands, and the strand and the core rope are in point contact. For this reason, wear and disconnection of strands with high surface pressure or contact portions between the strands and the core rope precede. Therefore, it is difficult to apply the maintenance management method based on the damage form progressing from the surface of the wire rope to the resin-coated wire rope.

  In response to this, a damage detection method directed to a resin-coated wire rope has been proposed (see, for example, Patent Document 2). This damage detection method detects that the buffering function of the covering material inside the rope has deteriorated by detecting energization between each strand and the core rope. According to this damage detection method, the damage state inside the rope can be detected and can be replaced before the strand or the core rope is seriously damaged.

JP 2005-529043 gazette JP 2010-195580 A

Nagata, Hase: Machine room-less elevator using small-diameter rope Japan Building Equipment and Elevator Center Official Paper “Building Equipment & Elevator” No. 57 (issued in September 2005)

  Since the damage detection method applied to the above-mentioned resin-coated wire rope (so-called coated rope) is a method of detecting energization between the tensile members, damage to the entire length of the resin-coated wire rope is detected with respect to damage to the internal coating material. Is done. Naturally, it is conceivable that the inner covering material is broken at a plurality of positions. In this case, even if the degree of individual damage is slight, if the damage occurs at a plurality of places, the energization amount of the entire rope becomes relatively large. On the other hand, when the contact (wear) between the wires increases particularly in the portion where the number of sheave passages is large due to the relationship between the stop floor and the like, a large energization amount is shown depending on the degree of damage.

  Here, even if the former is a plurality of places, if only the covering material is destroyed, the strength reduction as a rope is small. On the other hand, the latter is a damage with a large decrease in strength even if the degradation position is limited. It is difficult to distinguish between them by detecting the degree of deterioration due to the amount of energization.

  In order to ensure the strength reliability of the elevator rope, it is necessary to replace it with the lowest level of detection that can cause a decrease in strength. However, if the coating damage progresses almost evenly over the entire length depending on the use conditions, a reasonable judgment threshold is determined, such that it is uneconomical because it is diagnosed that replacement is necessary despite the small decrease in strength. Is difficult.

  Further, in the case of the above-described magnetic flaw detection method using the leakage magnetic flux of the disconnection portion, in the covered rope, the surface covering member is located between the magnetic sensor and the wire rope, and the disconnection portion is inside the rope. The distance between the magnetic sensor and the magnetic sensor increases as compared with the conventional rope, and the detection sensitivity decreases. In general, the amount of magnetic flux leakage at the broken portion is greatly affected by the number of broken wires and the distance between the fractured surfaces of the broken wires facing each other. That is, even if the number of fractured wires is large, the leakage magnetic flux is small if the distance of the fractured surface is small, and if the distance of the fractured surface is long even if the number of fractured wires is small, the leakage magnetic flux increases. Although the strength reduction is affected by the number of fractured wires, the correlation between the flaw detection output and the strength reduction is low, and it is difficult to detect the strength reduction appropriately.

  For this reason, in order to ensure strength reliability, it is necessary to replace the detection at the lowest level where strength reduction can be considered, as in the case of the energization detection described above, and excessive maintenance costs may increase.

  The problem to be solved by the present invention is an elevator rope deterioration determination method capable of accurately determining the deterioration state of a wire rope for an elevator, and based on this determination method, while maintaining safety, minimizing maintenance costs. It is an object of the present invention to provide a highly reliable elevator rope maintenance device that can be suppressed to a low level.

  An elevator rope deterioration determination method according to an embodiment of the present invention is an elevator rope deterioration determination method for determining a deterioration state of a rope in an elevator having a structure in which a passenger car is suspended by a wire rope, and measuring the diameter of the wire rope. The measured value is compared with a preset threshold value, and the deterioration state of the wire rope is determined based on the comparison result.

  An elevator rope maintenance device according to an embodiment of the present invention is an elevator rope maintenance device applied to an elevator having a structure in which a passenger car is suspended by a wire rope, and a rope outer diameter measuring device that measures the diameter of the wire rope; A calculation unit having a threshold value for determining the deterioration of the wire rope, and determining the deterioration state of the wire rope by comparing the diameter of the wire rope measured by the rope outer diameter measuring means and the threshold value. And a rope deterioration determination device.

  The rope outer diameter measuring device receives, via the wire rope, a light projecting unit that emits a light beam that intersects the length direction of the wire rope, and a light beam emitted from the light projecting unit. It is preferable to use an optical dimension measuring device that has a light receiving portion that generates an output signal corresponding to the light receiving width and detects the outer diameter of the rope from the light receiving width.

  The wire rope measured by the rope outer diameter measuring device has a core rope composed of a plurality of strands and a plurality of strands arranged on the outer periphery of the core rope via a core rope covering material. A covered rope in which the outer periphery of the entire rope including the strands is covered with a covering material may be used.

  In addition, as the threshold set in the calculation unit of the rope deterioration determination device, the rope outer diameter obtained in advance as a large internal damage to the wire rope starts as the first threshold, and the wire rope should be replaced It is good to set the rope outer diameter calculated | required beforehand as a 2nd threshold value.

  The rope deterioration determination device may include a recording unit that records a timing at which the diameter of the wire rope measured by the rope outer diameter measuring device reaches the threshold value.

  In addition, the calculation unit of the rope deterioration determination device replaces the wire rope from a rope outer diameter at which the inner diameter of the wire rope measured by the rope outer diameter measuring device starts a great amount of internal damage. You may have a calculation function which calculates | requires the estimated period from the state which should replace | exchange the said wire rope to the fracture | rupture of the said strand by multiplying the period until it reaches a power rope outer diameter.

  Furthermore, the rope outer diameter measuring device may be installed in the vicinity of the elevator hoisting machine.

  According to these configurations, the damaged state of the elevator rope can be easily grasped, high reliability can be ensured, and unnecessary rope replacement can be avoided.

It is the whole elevator rope maintenance equipment lineblock diagram concerning one embodiment of the present invention. It is a top view which expands and shows the rope outer diameter measuring apparatus part used for one Embodiment of this invention. It is the figure which looked at the rope outer diameter measuring apparatus part of the elevator rope maintenance apparatus which concerns on one Embodiment of this invention shown in FIG. 1 from the side surface. It is sectional drawing of the covering rope used as measurement object by one Embodiment of this invention. It is a figure which shows the example of a measurement of a rope outer diameter by one Embodiment of this invention. It is a figure showing the test state for describing one embodiment of the present invention. It is a figure showing transition of the rope outer diameter change for describing one embodiment of the present invention.

  Embodiments of the present invention will be described below.

  The elevator rope deterioration determination method according to this embodiment is a method for determining a rope deterioration state (damage state due to wire breakage, etc.) in an elevator having a structure in which a passenger car is suspended by a wire rope. The measured value is compared with a preset threshold value, and the deterioration state of the wire rope is determined based on the comparison result. In this elevator rope deterioration determination method, strength management of an elevator rope including a resin-coated wire rope is performed by measuring the outer diameter of the wire rope as described above.

  Hereinafter, a specific apparatus configuration for performing maintenance of an elevator rope using this elevator rope deterioration determination method will be described with reference to FIGS. 1 to 3.

  In these drawings, the elevator rope maintenance device includes a rope outer diameter measuring device 1 that measures the outer diameter of the elevator rope 20 and a rope deterioration determining device 2 that determines a deterioration state of the elevator rope 20 according to the measurement result. Outlined. The rope outer diameter measuring device 1 is an optical dimension measuring device including a light projecting unit 16 and a light receiving unit 17. The light projecting unit 16 emits a light beam (for example, laser light: hereinafter described as laser light) that intersects the length direction of the elevator rope 20. The light receiving unit 17 receives the laser light emitted from the light projecting unit 16 through the elevator rope 20 and generates an output signal corresponding to the light receiving width (the width of the shadow shielded by the elevator rope 20). That is, the outer diameter of the elevator rope 20 is detected from this light receiving width.

  The rope deterioration determination device 2 includes a control unit 19, a calculation unit 21, and a recording unit 22. The control unit 19 performs overall control of the rope deterioration determination device 2 and outputs a light emission command to the light emitting unit 16 and inputs a rope outer diameter based on the light receiving width from the light receiving unit 17 in order to operate the rope outer diameter measuring device 1. To do. Then, the measured rope outer diameter is output to the calculation unit 21 to execute a predetermined calculation.

  The arithmetic unit 21 is set with a threshold value for determining the deterioration of the rope outer diameter of the elevator rope 20. By comparing the rope outer diameter measured by the rope outer diameter measuring device 1 with the threshold value, the deterioration of the elevator rope 20 is deteriorated. The state (degree of damage state due to broken wire) is determined. Here, as the threshold value set in the calculation unit 21, a rope outer diameter that is obtained in advance as a significant internal damage to the elevator rope 20 starts is set as the first threshold value. Moreover, let the rope outer diameter calculated | required beforehand that the elevator rope 20 should be exchanged be a 2nd threshold value. These first and second threshold values will be described later in detail.

  Further, in addition to the above-described calculation function, the calculation unit 21 starts from the rope outer diameter at which the diameter of the elevator rope 20 measured by the rope outer diameter measuring device 1 starts severe internal damage to the elevator rope 20 described above. By multiplying the period until the outer diameter of the rope 20 to be replaced by a predetermined magnification, a function of obtaining an estimated period from the state where the elevator rope 20 should be replaced to the break of the strand is obtained.

  The recording unit 22 records the timing at which the outer diameter of the elevator rope 20 measured by the rope outer diameter measuring device 1 reaches the aforementioned threshold value.

  Here, a plurality of elevator ropes 20 are used in parallel as shown in the figure. In this embodiment, the elevator rope 20 will be described as a resin-coated wire rope. As shown in the cross-sectional shape of FIG. 4, the resin-coated wire rope 20 includes a core rope 12 composed of a plurality of strands, and a plurality of core ropes 12 disposed on the outer periphery of the core rope 12 via a core rope covering material 14. It has a structure in which the outer periphery of the entire rope including the plurality of strands 11 is covered with the resin coating material 13.

  Hereinafter, the detailed structure of each part mentioned above is demonstrated. In FIG. 1, a light projecting unit 16 constituting a rope outer diameter measuring device 1 (hereinafter described as an optical dimension measuring device) 1 emits a light beam by laser light. As shown in FIG. 2, the light receiving unit 17 includes a CCD sensor 18 that receives an optical beam and generates an output signal. The control unit 19 controls the light beam, and calculates and outputs the length of the object to be measured based on the output from the CCD sensor 18.

  FIG. 3 is a layout view of the light projecting unit 16 and the light receiving unit 17 of FIG. 1 viewed from the side. The light projecting unit 16 and the light receiving unit 17 are arranged so as to sandwich the resin-coated wire rope 20 as a measurement target between them. Then, the resin-coated wire rope 20 to be measured is scanned with a light beam from the light projecting unit 16, and the shadow portion (boundary) of the rope 20 projected on the CCD sensor 18 of the light receiving unit 17 is detected, thereby the rope 20. Measure the outer diameter. That is, the shadow length L (the outer diameter of the rope 20) can be calculated from the CCD arrangement of the CCD sensor 18 and the like. If the above-described scanning is repeated and the rope 20 is sent in the longitudinal direction, the diameter of the rope 20 can be measured continuously and automatically in a non-contact manner.

  Note that by increasing the scanning speed of the light beam and increasing the number of scans per time, measurement is possible even when the rope 20 moves at a higher speed.

  Here, it is desirable that the number of scans is 500 times / second or more in order to measure the rope routed for the elevator at the inspection speed (the rope moving speed lower than that during the elevator operation). Regarding such an optical dimension measuring apparatus 1, even a commercially available one can easily obtain the performance of measuring the outer diameter with an accuracy of several μm. Since the resolution required for determining the life based on the outer diameter of the rope is about several tens of μm or more, sufficient measurement accuracy can be obtained even if the optical dimension measuring apparatus 1 that is easy to measure is used.

  FIG. 5 shows a part of a waveform obtained by actually measuring the outer diameter of the resin-coated wire rope 20 by the optical dimension measuring apparatus 1 as described above. In FIG. 5, the vertical axis represents the measured rope diameter, and the horizontal axis represents the distance from the measurement start point in the moving direction (length direction) of the rope to be measured. The shape of the measurement waveform is undulating following the external shape of the strand structure. This measured value is affected by the scanning speed, rope feed speed, and rope swing. Further, it is desirable that the angle formed by the axial direction (feed direction) of the rope and the scanning direction of the light beam be orthogonal. Otherwise, the absolute value of the measured diameter will be affected, but the peak value of the output waveform is consistent with the measured value by the micrometer (shown as a dot near the peak of the waveform in FIG. 5). Even with these effects, the diameter of each part can be measured with sufficient accuracy.

  It is easy to extract only the peak value portion from the rope outer diameter output shown in FIG. 5 and identify that the predetermined threshold value has been reached. The apparatus shown in FIG. 1 has a function of continuously measuring the outer diameter of the rope during maintenance of the resin-coated wire rope 20 and issuing an alarm when the outer diameter of the rope reaches a predetermined threshold value due to aging. That is, in FIG. 1, the calculation unit 21 extracts a peak value and generates an alarm signal when a predetermined threshold is reached.

  The recording unit 22 records the timing at which the alarm signal is issued. The recording unit 22 can grasp the operation time after the resin-coated wire rope 20 reaches a predetermined threshold value. As described above, the calculation unit 21 has a plurality of threshold values, and the recording unit 22 also records the timing of alarm signal generation for each of the threshold values. It will be described later that the reliability of strength management is increased by providing a plurality of threshold values.

  A reasonable threshold value for performing maintenance based on the outer diameter of the resin-coated wire rope 20 will be described. The conventional method for managing the outer diameter of an elevator main rope defined in JIS A4302 is based on the fact that the diameter of the worn portion is 90% or more of the diameter of the non-weared portion. This is operated under conditions of use where the rope surface is in direct contact with the sheave groove of the hoist.

  In order to know the relationship between the progress of internal damage of the resin-coated wire rope 20 and the outer diameter of the wire rope, the inventors set a combination condition of a wire rope and a sheave simulating the resin-coated wire rope 20. The test was conducted. That is, as shown in FIG. 6, a resin coating 62 is applied to the surface of the sheave groove 61, and the wire rope 63 side includes a central rope 64 arranged at the center and a plurality of strands 65 arranged evenly around the core rope 64. The outer periphery of the core rope 64 (between each strand 65) is covered with a covering material 66. Since the resin coating 62 is applied to the surface side of the sheave groove 61, the surface of the rope 63 is not coated with the resin.

  A bending fatigue test was performed under such combination conditions, and the number of loads, the outer diameter of the rope, and the damage state were recorded. By using the wire rope 63 having no surface coating, oil can be supplied to the inside of the rope 63 and the internal damage can be suppressed, so that a rope with little internal damage can be obtained as a comparison object. Since the actual resin-coated wire rope 20 is coated on the surface, it cannot be lubricated. In the test example of FIG. 6, the wire rope 63 to be tested was subjected to a bending fatigue test without lubrication, and internal damage progressed. Corresponds to the characteristics of the actual resin-coated wire rope 20. Therefore, the transition of the outer diameter and the decrease in strength are compared and verified for the rope that has undergone internal damage without lubrication and the rope that has suppressed internal damage by lubrication. As described above, the internal damage of the actual resin-coated wire rope 20 is considered to show a damage transition similar to the condition of no oil supply in this test.

  The results of this test are shown in FIG. FIG. 7 shows the transition of the outer diameter of the wire rope 63 during the bending fatigue test on the four ropes (three lubrication-free conditions and one lubrication condition) (the vertical axis is the measured rope outer diameter divided by the nominal diameter). Numerical value).

  In the resin-coated wire rope 20, since there is no contact between the sheave groove surface and the strand, damage inside the rope with severe load precedes. Also in this test, the damage (wear) on the surface of the rope 63 is not noticeable due to the resin coating 62 applied to the surface of the sheave groove 61, and the cause of the decrease in the outer diameter of the rope is internal damage (between the core rope coating material 66 and the strand 65). The main cause is damage to the strands of the part.

  After the start of the test, the rope outer diameter decreases uniformly under all conditions. This is mainly due to deformation of the core rope covering material 66 which is an elastic-plastic structure and initial wear of the strands between the strands 65. In any case, the decrease in strength is within 10% of the standard breaking load, which is a level that does not interfere with use.

  When the number of bending loads exceeds 3 million, there is a difference in the transition of the diameter between the condition in which internal damage is suppressed by lubrication and the condition in which internal damage progresses without lubrication. Under conditions where internal damage was suppressed by refueling, the outer diameter of the rope was substantially constant from 3 million times to 8.5 million times when the test was terminated, and the strength reduction was within 10% of the standard breaking load.

  On the other hand, under the non-lubricating condition, the outer diameter of the rope decreased at a substantially constant rate after 3 million times, and the strand 65 was broken at 5.5 to 6.5 million times (no oiling conditions 1 and 2). The decrease in the outer diameter of the rope at the time of the strand break was about 10% to 14% of the nominal rope diameter. The condition 3 in which no oil was supplied was obtained by cutting the test after about 4 million times in order to measure the residual strength rate, but the strength was reduced by 19% with respect to the standard breaking load.

  According to this test, it is found that there is a high correlation between the outer diameter of the rope and the degree of damage even in the resin-coated wire rope. According to this test, in order to maintain the cross-sectional structure of the rope (to prevent strand breakage), the diameter reduction is within 10% of the nominal diameter, and in order to ensure an initial strength rate of about 80%, the nominal diameter is 6%. It was found that replacement within% was required. Thus, in this embodiment, the rope replacement threshold is set to a reduction value corresponding to 6% of the nominal diameter of the inner rope. As a result, sufficient safety can be ensured and unnecessary replacement can be avoided.

Separately from the above test, a bending fatigue test is performed on the resin-coated wire rope 20 and the residual strength at the above-described replacement threshold is measured. As shown in the table below, the residual strength rate is 80% of the standard breaking load, which is the residual strength that should be possessed when using an elevator in the performance evaluation according to Article 1, paragraph 129, item 4 of the Building Standards Law Enforcement Ordinance Satisfies. The decrease in strength is smaller than that in the bending fatigue test for the rope 63 without resin coating shown in FIG. This is because, in the case of a test on a resin-coated wire rope, the decrease in the diameter of the inner wire rope portion is reduced by that amount because the decrease in the diameter in the exchange state includes the decrease in the thickness of the resin-coated portion on the surface. As a result, there was a margin for strength.

  The life of an elevator wire rope is affected by the frequency of start-up, tension, lifting and lowering strokes, etc., and therefore varies depending on the property used, and the variation in years of use is extremely large. In general, it is difficult to accurately predict the period until breakage after reaching the replacement threshold, and it is necessary to consider the load conditions specific to the property.

  However, based on the transition (damage transition) characteristics of the outer diameter of the rope shown in FIG. That is, as described above, when severe internal damage starts (the timing of bending 3 million times in FIG. 7), the rope outer diameter decreases at a substantially constant rate thereafter, leading to the breakage of the rope (strand break). . Since the inside diameter of the rope starts to decrease by about 4%, a large amount of internal damage starts. From the state of use until the rope replacement threshold (diameter reduction reaches 6%) from that state, The period of time until the 10% reduction in diameter at which strand breakage can occur can be estimated as follows, and the necessity of replacement according to the property can be grasped.

Estimated period from replacement standard condition to strand break = (In a specific property, the period from 4% to 6% decrease in rope outer diameter) x (10-6) / (6-4)
That is, a predetermined magnification (in the above formula), the measured diameter of the wire rope is from a rope outer diameter at which a great amount of internal damage starts to the wire rope to a rope outer diameter at which the wire rope should be replaced. 2), an estimated period from the state where the wire rope should be replaced to the break of the strand is obtained. This life estimation is executed by the functions of the calculation unit 21 and the recording unit 22 shown in FIG.

  In addition, the elevator rope maintenance apparatus which consists of a structure of FIG. 1 thru | or FIG. 3 has a desirable installation position about a measurement part on reliability of determination. That is, it is desirable to install the light projecting portion 16 and the light receiving portion 17 of the rope outer diameter measuring device 1 in the vicinity of the elevator hoisting machine. If the rope 20 is in the vicinity of the sheave around which the rope 20 is wound, the lateral vibration of the rope 20 is small and the measurement accuracy is good. In addition, in a traction (friction drive) type elevator, the load due to the drive sheave is higher than the load due to other sheaves, so the rope damage in the portion that contacts the groove of the drive sheave is the most severe and should be installed near the elevator hoist. This damage state can be accurately detected.

  The device configuration shown in FIGS. 1 to 3 is obtained by dividing the device according to this embodiment as a device for each necessary function, and the wiring connection in the figure means a functional connection. ing. Therefore, as for the physical configuration, even if one of a plurality of components shown in FIGS. 1 to 3 is housed in, for example, one housing and integrated, it is an equivalent device.

  Of the devices constituting the maintenance device, only the light projecting unit 16 and the light receiving unit 17 of the rope outer diameter measuring device 1 are limited in installation location. For example, when this device is configured as a part of a remote maintenance device, only the light projecting unit 16 and the light receiving unit 17 of the rope outer diameter measuring device 1 need to be installed in the elevator structure, and other devices are separated. It may be configured to be provided at a place and the connection of wiring connection is configured by wireless communication means or the like.

  In the above embodiment, the covered rope has been described as an example of the elevator rope 20. However, determining the damaged state of the rope from the outer diameter of the rope is also used for determining the damaged state of a general wire rope that does not cover the surface. be able to.

  Further, as the rope outer diameter measuring device, a non-contact type optical dimension measuring device using a laser beam has been exemplified, but the present invention is not limited to this, and a contact-type known size measuring device may be used. Good.

  Further, the life of the elevator rope 20 obtained by the calculation unit 21 and the recording unit 22, the alarm signal, and the like may be transmitted to a management facility provided at a remote place by an external line such as the Internet.

  By using the elevator rope deterioration judging method and the elevator rope maintenance device according to the present embodiment described above, it is possible to easily grasp the damaged state of the elevator rope and ensure high reliability, and avoid unnecessary rope replacement. Can do. In addition, remote maintenance can greatly reduce the man-hours required for rope maintenance.

  Although several embodiments of the present invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Rope outer diameter measuring apparatus 2 ... Rope deterioration determination apparatus 11 ... Strand 12 ... Core rope 13 ... Outer peripheral covering material of the whole rope 14 ... Heart rope covering material 16 ... Light projecting unit 17 ... Light receiving unit 18 ... CCD sensor 19 ... Control unit 20 ... Elevator rope 21 ... Calculating unit 22 ... Recording unit

Claims (8)

An elevator rope deterioration determination method for determining a deterioration state of a rope in an elevator having a structure in which a passenger car is suspended by a wire rope,
An elevator rope deterioration determination method, comprising: measuring a diameter of the wire rope, comparing the measured value with a preset threshold value, and determining a deterioration state of the wire rope based on the comparison result. An elevator rope maintenance device applied to an elevator having a structure in which a car is suspended by a wire rope,
A rope outer diameter measuring device for measuring the diameter of the wire rope;
A calculation unit having a threshold value for determining the deterioration of the wire rope is set, and the deterioration state of the wire rope is determined by comparing the diameter of the wire rope measured by the rope outer diameter measuring unit and the threshold value. A rope deterioration judging device;
An elevator rope maintenance device characterized by comprising:   The rope outer diameter measuring device receives, via the wire rope, a light projecting unit that emits a light beam that intersects the length direction of the wire rope, and a light beam emitted from the light projecting unit. The elevator rope maintenance apparatus according to claim 2, wherein the elevator rope maintenance apparatus is an optical dimension measurement apparatus that includes a light receiving unit that generates an output signal corresponding to a light reception width and detects an outer diameter of the rope from the light reception width.   The wire rope measured by the rope outer diameter measuring device has a core rope composed of a plurality of strands and a plurality of strands arranged on the outer periphery of the core rope via a core rope covering material. The elevator rope maintenance apparatus according to claim 2, wherein the rope is a covered rope in which an outer periphery of the entire rope including the wire is covered with a covering material.   As a threshold set in the arithmetic unit of the rope deterioration determination device, a rope outer diameter obtained in advance as a large internal damage to the wire rope starts as a first threshold, and the wire rope should be replaced in advance. The elevator rope maintenance device according to any one of claims 2 to 4, wherein the obtained outer diameter of the rope is set as a second threshold value.   The said rope deterioration determination apparatus has a recording part which records the timing when the diameter of the said wire rope measured by the said rope outer diameter measuring apparatus reached the said threshold value, Any one of Claim 2 thru | or 5 characterized by the above-mentioned. Elevator rope maintenance device according to the above.   The calculation unit of the rope deterioration determination device is configured to replace the wire rope from a rope outer diameter at which the inner diameter of the wire rope measured by the rope outer diameter measuring device starts to cause significant internal damage to the wire rope. 7. The calculation function according to claim 6, further comprising an arithmetic function for obtaining an estimation period from a state in which the wire rope is to be replaced to a break of the strand by multiplying a period until reaching the outer diameter by a predetermined magnification. Elevator rope maintenance equipment.   The elevator rope maintenance apparatus according to any one of claims 2 to 7, wherein the rope outer diameter measuring device is installed in the vicinity of the elevator hoisting machine.

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