JP2020059602A - Elevator rope diagnosis system and diagnosis method - Google Patents

Abstract

To provide an elevator rope diagnosis system which facilitates work for specifying a position of a rope corresponding to an optional position of a wave form indicating a magnetic flux.SOLUTION: An elevator rope diagnosis system 1 includes: a magnetic flux detecting portion 3 which detects a magnetic flux of a magnetized elevator rope; a displacement detecting portion 4 which detects the displacement amount of the magnetic flux detecting portion 3 with respect to the rope; and a wave form computing portion 5c which computes a wave form made from a rope distance shaft and a magnetic flux shaft, on the basis of the magnetic flux detected by the magnetic flux detecting portion 3 and the displacement amount detected by the displacement detecting portion 4.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an elevator rope diagnosis system and a diagnosis method.

  Conventionally, for example, an elevator rope diagnostic system, a magnetic flux detection unit that detects the leakage magnetic flux from the magnetized elevator rope, based on the leakage magnetic flux detected by the magnetic flux detection unit, from the time axis and the leakage magnetic flux axis. And a waveform calculation unit that calculates the waveform (for example, Patent Document 1). When the rope is broken, the magnetic flux leaks from the broken portion. Therefore, it is determined whether or not the rope is broken based on the magnitude of the leakage magnetic flux.

  By the way, since the waveform showing the detected magnetic flux (for example, the magnetic flux leaking from the rope, the magnetic flux passing through the inside of the rope, etc.) is composed of the time axis and the magnetic flux axis, even if it is determined that the rope is broken, Accurately identifying the location of a broken wire in a rope is a difficult task. For example, even if the rope disconnection position can be specified to some extent (for example, the range corresponding to the distance between adjacent floors) by specifying the time when the elevator car is located at a predetermined landing, Further, it is a difficult task to accurately identify the position where the rope is broken.

JP, 2009-249117, A

  Therefore, an object is to provide a diagnostic system and a diagnostic method for an elevator rope that facilitates the work of identifying the position of the rope corresponding to an arbitrary position of the waveform indicating the magnetic flux.

  The elevator rope diagnostic system is a magnetic flux detection unit that detects a magnetic flux of a magnetized elevator rope, a displacement detection unit that detects a displacement amount of the magnetic flux detection unit with respect to the rope, and a magnetic flux detected by the magnetic flux detection unit. And a waveform calculation unit that calculates a waveform composed of the rope distance axis and the magnetic flux axis based on the displacement amount detected by the displacement detection unit.

  Further, the elevator rope diagnostic system may be configured to include a noise removal calculation unit that calculates a corrected waveform in which noise is removed from the waveform calculated by the waveform calculation unit. .

  In the elevator rope diagnosis system, the magnetic flux detection unit detects a leakage magnetic flux from the elevator rope, and the noise removal calculation unit is based on the waveform calculated by the waveform calculation unit, and is a Fourier series. A function calculation unit that calculates a function by expansion, a component removal unit that removes a component having a predetermined cycle from the function calculated by the function calculation unit, and a component removal unit that has removed the component having the predetermined cycle It may be configured to include a corrected waveform calculation unit that calculates a waveform based on a later function.

  Further, the elevator rope diagnosis system may include a disconnection determination unit that determines whether or not the rope is disconnected based on the waveform calculated by the correction waveform calculation unit.

  In addition, the method of diagnosing an elevator rope includes detecting a magnetic flux of a rope by a magnetic flux detecting unit that detects a magnetic flux being displaced in a rope length direction with respect to a magnetized rope for an elevator. Detecting the amount of displacement of the magnetic flux detector with respect to, and calculating a waveform composed of the rope distance axis and the magnetic flux axis based on the detected magnetic flux and the detected amount of displacement.

FIG. 1 is a schematic diagram showing a state in which an elevator rope diagnosis system according to an embodiment diagnoses a rope. FIG. 2 is a control block diagram of the elevator. FIG. 3 is a perspective view of the diagnostic tool according to the embodiment of FIG. FIG. 4 is a vertical cross-sectional view of the magnetic flux detection unit according to the same embodiment. FIG. 5 is a perspective view of a main part of the magnetic flux detection unit according to the embodiment. FIG. 6 is a vertical cross-sectional view of a main part of the magnetic flux detection unit according to the same embodiment. FIG. 7 is a control block diagram of the diagnostic system according to the embodiment. FIG. 8 is a main part view of the elevator rope. 9 is a sectional view taken along line IX-IX in FIG. FIG. 10 is a control flow chart of the diagnostic system. FIG. 11 is a diagram showing the relationship between time and magnetic flux. FIG. 12 is a diagram showing the relationship between time and the amount of displacement of the magnetic flux detection unit with respect to the rope. FIG. 13 is a diagram showing the relationship between the rope distance and the magnetic flux. FIG. 14 is a diagram showing the relationship between the corrected rope distance and magnetic flux. FIG. 15 is a control block diagram of a diagnostic system according to another embodiment.

  Hereinafter, an embodiment of a diagnostic system and a diagnostic method for an elevator rope will be described with reference to FIGS. 1 to 14. In each drawing, the dimensional ratios of the drawings and the actual dimensional ratios do not necessarily match, and the dimensional ratios of the drawings do not necessarily match.

  As shown in FIG. 1, a diagnostic system 1 for an elevator rope 11 according to the present embodiment (hereinafter, also simply referred to as “diagnostic system”) 1 is used for diagnosing whether or not the rope 11 is broken. Here, the configuration of the elevator 10 will be described before describing each configuration of the diagnostic system 1.

  As shown in FIGS. 1 and 2, the elevator 10 includes a car 10a on which a user rides, and a counterweight 10b connected to the car 10a by a rope 11. The elevator 10 also includes a hoisting machine 10d having a sheave 10c around which the rope 11 is wound, and an elevator control section 12 that controls the hoisting machine 10d and other parts.

  The elevator 10 according to the present embodiment has a configuration in which the hoisting machine 10d is arranged inside the machine room X1, but the configuration is not limited to such a configuration. For example, the elevator 10 may have a configuration in which the hoisting machine 10d is arranged inside the hoistway X2.

  The elevator 10 includes a movement information input unit 10e for inputting information about movement of the car 10a to a user or a worker. Further, the elevator 10 includes a car position detection unit 10f that detects that the car 10a is located at each landing X3, and a car movement amount detection unit 10g that detects the movement amount of the car 10a.

  The movement information input unit 10e is, for example, an operation button operated by a user (an operation button arranged inside the car 10a, an operation button arranged at each landing X3) or a manual operation unit operated by a worker. is there. The manual operation unit can input and set the moving speed, moving direction, and moving distance of the car 10a.

  Although the configuration of the car position detection unit 10f is not particularly limited, for example, the car position detection unit 10f may be various sensors (for example, photoelectric sensor, proximity sensor, etc.) arranged in each landing X3. The configuration of the car movement amount detection unit 10g is not particularly limited, but the car movement amount detection unit 10g may be, for example, various sensors (for example, encoders) that detect the rotation amount of the sheave 10c.

  The elevator control unit 12 includes an acquisition unit 12a that acquires each piece of information and a storage unit 12b that stores various kinds of information. The elevator controller 12 also includes a car position calculator 12c that calculates the position of the car 10a and a hoisting controller 12d that controls the operation of the hoisting machine 10d.

  The car position calculation unit 12c calculates the position of the car 10a based on the information detected by the car position detection unit 10f and the car movement amount detection unit 10g. For example, the car position calculation unit 12c can also calculate the moving amount of the car 10a and the moving speed of the car 10a based on the position of the car 10a.

  The diagnostic system 1 includes a diagnostic tool 2 for diagnosing the rope 11. The position where the diagnostic tool 2 is arranged is not particularly limited. For example, in FIG. 1, the diagnostic tool 2 is arranged inside the machine room X1. Further, the diagnostic tool 2 may be fixed to, for example, the machine room X1 (for example, the floor), or may be gripped by a worker, for example.

  As illustrated in FIG. 3, the diagnostic tool 2 includes a magnetic flux detection unit 3 that detects a magnetic flux of the rope 11, a displacement detection unit 4 that detects a displacement amount of the magnetic flux detection unit 3 with respect to the rope 11, a magnetic flux detection unit 3, and a displacement. The diagnostic tool main body 2a that connects the detection unit 4 is provided. In the present embodiment, the magnetic flux detection unit 3 and the displacement detection unit 4 are fixed to each other, but for example, the magnetic flux detection unit 3 and the displacement detection unit 4 are separated from each other, It may be configured.

  The displacement detecting unit 4 includes a rotating unit 4a whose outer periphery is in contact with the rope 11, a rotation detecting unit 4b that detects the amount of rotation of the rotating unit 4a, and the rotating unit 4a and the diagnostic tool body so that the rotating unit 4a can rotate. 2a and the connection part 4c which connects. The configuration of the rotation detection unit 4b is not particularly limited, but for example, the rotation detection unit 4b may be various sensors (for example, encoders) that detect the rotation amount of the rotation unit 4a.

  The outer peripheral portion of the rotating portion 4a is formed in a concave shape so that the rope 11 can be hooked and positioned. The connecting portion 4c is displaceably connected to the diagnostic tool body 2a, and the displacement detecting portion 4 includes an elastic portion 4d that applies a force to the rotating portion 4a toward the rope 11. Therefore, the elastic portion 4d is elastically deformed, so that the rotating portion 4a pressurizes and contacts the rope 11.

  The configuration of the displacement detection unit 4 is not particularly limited as long as the displacement amount of the magnetic flux detection unit 3 with respect to the rope 11 can be detected. For example, the rotation unit 4a, the rotation detection unit 4b, the connection unit 4c, and the elastic unit 4d may have different configurations from the configuration according to the present embodiment, or may not be provided.

  The magnetic flux detection unit 3 includes a detection unit main body 3a that detects the magnetic flux of the rope 11, and a connection unit 3b that connects the detection unit main body 3a and the diagnostic tool main body 2a. The connecting portion 3b is displaceably connected to the diagnostic tool body 2a, and the magnetic flux detecting portion 3 includes an elastic portion 3c that applies a force to the detecting portion body 3a toward the rope 11. Therefore, due to the elastic deformation of the elastic portion 3c, the detection portion main body 3a is pressed against the rope 11 and is in contact therewith.

  By the way, the diagnosis using the magnetic flux includes, for example, the leakage magnetic flux method and the total magnetic flux method. In the present embodiment, the leakage magnetic flux method is adopted, and the magnetic flux detection unit 3 is configured to detect the magnetic flux leaking from the rope 11, for example. In addition, the total magnetic flux method may be adopted, and the magnetic flux detection unit 3 may be configured to detect the magnetic flux passing through the inside of the rope 11, for example. The configuration may be such that the magnetic flux of is detected.

  The leakage flux method is to detect the magnetic flux leaking from the magnetized rope 11 and diagnose the deterioration of the rope 11. For example, when unevenness occurs on the surface of the rope 11 due to wire breakage, magnetic flux leaks from the unevenness, so the rope 11 is diagnosed by detecting the leaked magnetic flux (for example, discovery of broken wire). )can do.

  On the other hand, the total magnetic flux method is to detect the magnetic flux passing through the inside of the magnetized rope 11 and diagnose the deterioration of the rope 11. For example, when the effective cross-sectional area (cross-sectional area through which magnetic flux can pass) changes due to the rope 11 becoming partially thin, corrosion, wear, etc., the magnetic flux passing through the inside of the portion decreases. Therefore, by detecting the magnetic flux, the rope 11 can be diagnosed (for example, thinning, corrosion, wear, and disconnection detection).

  As shown in FIG. 4, the detection unit main body 3a cooperates with the permanent magnets 3d and 3d for magnetizing the rope 11 and the permanent magnets 3d and 3d and the rope 11 to form a magnetic circuit (illustrated by a solid arrow in FIG. 4). In order to constitute, it has the yoke 3e which connects the permanent magnets 3d and 3d. The material of the yoke 3e is not particularly limited, but the yoke 3e has a high magnetic permeability and may be formed of, for example, pure iron or low carbon steel.

  The detection unit main body 3a includes a measurement unit 3f that measures the leakage magnetic flux from the rope 11, and a magnetic unit 3g that is arranged to cover a predetermined portion of the rope 11 in order to collect the leakage magnetic flux from the rope 11. There is. The magnetic part 3g has magnetism, and the measuring part 3f measures the magnetic flux passing through the magnetic part 3g. The configuration of the measurement unit 3f is not particularly limited, but for example, the measurement unit 3f may be a detection coil that converts the magnitude of magnetic flux into the magnitude of voltage (current).

  Further, the detection unit main body 3a includes a guide portion 3h for guiding the rope 11 at the tip. The guide portion 3h is formed in a concave shape for hooking and positioning the rope 11. The guide portion 3h includes a magnetic portion 3g and a non-magnetic portion 3i. The magnetic portion 3g and the non-magnetic portion 3i are connected to each other.

  The material of the magnetic portion 3g is not particularly limited, but the magnetic portion 3g has a high magnetic permeability and may be formed of, for example, pure iron or low carbon steel. The material of the non-magnetic portion 3i is not particularly limited, but the non-magnetic portion 3i has a low magnetic permeability, and may be formed of, for example, a hard resin.

  For example, the magnetic permeability of the magnetic portion 3g is preferably 100 times or more the magnetic permeability of the non-magnetic portion 3i, and more preferably 1000 times or more. Further, for example, the magnetic permeability of the magnetic portion 3g is preferably 100 times or more, and more preferably 1000 times or more that of the atmosphere.

  The configuration of the magnetic flux detection unit 3 is not particularly limited as long as the magnetic flux of the magnetized rope 11 can be detected. For example, the detecting unit 3a, the connecting unit 3b, the elastic unit 3c, the permanent magnet 3d, the yoke 3e, the measuring unit 3f, the magnetic unit 3g, the guiding unit 3h, and the non-magnetic unit 3i are different from the configuration according to the present embodiment. It may be configured or may not be provided.

  As shown in FIGS. 5 and 6, the magnetic portion 3g includes end portions 3j and 3j and a connecting portion 3k that connects the end portions 3j and 3j. The tip of the end portion 3j is formed in a concave shape to form the guide portion 3h, and the connecting portion 3k is connected to the base end of the end portion 3j and extends along the rope 11 (guide portion 3h). There is.

  As a result, the magnetic portion 3g is arranged so as to cover a part of the rope 11 (hereinafter referred to as “magnetic coating portion”) 11a. The leakage magnetic flux from the magnetic coating portion 11a of the rope 11 is collected by the magnetic portion 3g, and the measuring unit 3f measures the magnetic flux passing through the connecting portion 3k. Therefore, the leakage magnetic flux from the magnetic coating portion 11a of the rope 11 can be reliably detected.

  As shown in FIG. 7, the diagnostic system 1 includes a rope information input unit 1a to which information on the rope 11 is input and a diagnostic information input unit 1b to which information for diagnosis is input. The diagnostic system 1 also includes a processing unit 5 that processes information, and an output unit 1c that outputs the information processed by the processing unit 5.

  The rope information input unit 1a receives, for example, information about the rope 11 being diagnosed (for example, the outer diameter of the rope 11). Information related to diagnosis (for example, a diagnosis start instruction, a diagnosis end instruction, etc.) is input to the diagnosis information input unit 1b. The configuration of each input unit 1a, 1b is not particularly limited, but for example, each input unit 1a, 1b may be a mouse, a keyboard, or various switches. The output unit 1c may be, for example, a device that displays information (for example, a monitor), or may be a device that outputs a signal to the outside, for example.

  The processing unit 5 includes an acquisition unit 5a that acquires information from each unit 1a, 1b, 3, 4, and a storage unit 5b that stores various information. In addition, the processing unit 5 calculates a waveform composed of the rope distance axis and the magnetic flux axis based on the magnetic flux detected by the magnetic flux detection unit 3 and the displacement amount detected by the displacement detection unit 4, and a waveform calculation unit 5c. A noise removal calculation unit 5h that calculates a correction waveform in which noise is removed from the waveform calculated by the calculation unit 5c, and a disconnection determination unit that determines whether or not the rope 11 is disconnected based on the correction waveform calculated by the noise removal calculation unit 5h. With 5g.

  The noise removal unit 5h calculates a component of a predetermined cycle for the function calculation unit 5d that calculates a function by Fourier series expansion and the function calculated by the function calculation unit 5d based on the waveform calculated by the waveform calculation unit 5c. And a component removing unit 5e for removing. Further, the noise removing unit 5h includes a correction waveform calculating unit 5f that calculates a correction waveform based on the correction function after the component removing unit 5e removes the component having a predetermined cycle.

ここで、ｆ（ｘ）は、磁束であり、ｘは、ロープ距離であり、Ｌは、ロープ１１の全計測距離、即ち、磁束が計測されたロープ１１の範囲の全長である。また、Ｌ／ｎは、周期であり、周期がＬ／ｎの成分とは、Ａ_ｎｃｏｓ（ｎ・２π／Ｌ）ｘ及びＢ_ｎｓｉｎ（ｎ・２π／Ｌ）ｘである。 The function calculation unit 5d calculates the waveform calculated by the waveform calculation unit 5c into the following function that is Fourier series expanded.

Here, f (x) is the magnetic flux, x is the rope distance, and L is the total measurement distance of the rope 11, that is, the total length of the range of the rope 11 where the magnetic flux is measured. Further, L / n is a cycle, and the components having a cycle of L / n are A _n cos (n · 2π / L) x and B _n sin (n · 2π / L) x.

  The component removing unit 5e removes a component having a period that causes disturbance (noise) from the function calculated by the function calculating unit 5d. Specifically, the component removing unit 5e removes a component having a period larger than a predetermined period and a component having a period smaller than the predetermined period with respect to the function.

  The correction waveform calculation unit 5f calculates the correction waveform based on the correction function from which the component of the period that becomes the disturbance is removed, and the disconnection determination unit 5g determines the presence or absence of the disconnection of the rope 11 based on the correction waveform. To do. This makes it possible to properly determine whether or not the rope 11 is broken.

  Here, in the leakage magnetic flux method, an example of a component of a period that becomes a disturbance will be described. First, returning to FIG. 6, the disturbance that can be identified from the structure of the magnetic flux detection unit 3 will be described.

  Although the magnetic flux leaks from the rope 11, the magnitude of the magnetic flux leaking from the rope 11 increases as the position of the unevenness on the surface of the rope 11 increases. Then, as shown in FIG. 6, when the rope 11 has the disconnection portion 11b, large unevenness is present on the surface of the rope 11, so that the magnitude of the magnetic flux leaking from the disconnection portion 11b of the rope 11 is ,growing.

  The period of the leakage magnetic flux detected by the magnetic flux detection unit 3 is substantially the same as the length of the unevenness on the surface of the rope 11 (the dimension in the rope length direction D4). That is, the period of the leakage magnetic flux due to the disconnection portion 11b of the rope 11 is substantially the same as the length of the disconnection portion 11b (dimension in the rope length direction D4) W1.

  By the way, the magnetic part 3g collects the leakage magnetic flux from the magnetic coating part 11a of the rope 11, and the measuring part 3f measures the magnetic flux passing through the magnetic part 3g. On the other hand, the leakage magnetic flux from the portion other than the magnetic coating portion 11a of the rope 11 leaks to the atmosphere, so that the measurement unit 3f can hardly measure.

  As a result, the magnetic flux detection unit 3 cannot detect the leakage magnetic flux of the component having a period larger than the length (dimension in the rope length direction D4) W2 of the magnetic coating portion 11a (magnetic portion 3g). Therefore, a component having a period larger than the length W2 of the magnetic coating portion 11a is highly likely to be a disturbance. Therefore, it is preferable that the component having a period larger than the length W2 of the magnetic coating portion 11a is removed from the Fourier series expanded function.

  Next, the first disturbance that can be identified from the structure of the rope 11 to be diagnosed in the leakage magnetic flux method will be described.

  As shown in FIGS. 8 and 9, the rope 11 includes a core material 11c arranged in the center and a plurality of strands 13 arranged around the core material 11c and twisted together. The strand 13 includes a plurality of strands 13a and 13b, specifically, a plurality of inner strands 13a arranged inside and a plurality of strands arranged around the inner strand 13a to form an outer layer and twisted together. And the outer strand 13b.

  The numbers of the strands 13, the inner wires 13a, and the outer wires 13b are not particularly limited. The material of the core material 11c is not particularly limited, but for example, the core material 11c may be formed of fiber or synthetic resin. The materials of the inner wires 13a and the outer wires 13b are not particularly limited, but may be formed of steel, for example.

  By the way, since the plurality of strands 13 are twisted together, the rope 11 is provided with a convex portion 11d that is convex outward in the radial direction. And since the convex part 11d comprises the unevenness | corrugation of the surface of the rope 11, the magnetic flux of the substantially same period as the length (dimension of rope length direction D4) W3 of the convex part 11d originates in the convex part 11d. It leaks from the rope 11.

  Moreover, for example, even when the entire exposed portion of the outer wire 13b (for example, the portion shown by hatching in the center of FIG. 8) is broken due to disconnection, the length of the disconnection portion 11b. (Dimension in the rope length direction D4) is smaller than the length W3 of the convex portion 11d. For example, when the disconnection portion 11b extends in parallel with the rope length direction D4, the length of the disconnection portion 11b becomes the maximum and is substantially the same as the length W3 of the convex portion 11d.

  As a result, it is highly possible that a component having a period equal to or longer than the length W3 of the protrusion 11d is a disturbance. Therefore, it is preferable that the component having the period of the length W3 or more of the convex portion 11d is removed from the Fourier series expanded function.

  In the present embodiment, the length W2 of the magnetic coating portion 11a (magnetic portion 3g) is longer than the length W3 of the convex portion 11d. The length W2 of the magnetic coating portion 11a (magnetic portion 3g) may be smaller than the length W3 of the convex portion 11d.

  Next, the second disturbance that can be identified from the structure of the rope 11 to be diagnosed in the leakage magnetic flux method will be described.

  Since the plurality of outer strands 13b are twisted together with a large force, when the outer strand 13b is cut, the tip portion 13c of the outer strand 13b is pushed outward. As a result, the tip portion 13c of the outer strand 13b rides on the outside of the adjacent outer strand 13b or protrudes radially outward. Then, since the tip end portion 13c of the outer strand 13b constitutes unevenness on the surface of the rope 11, the magnetic flux having a cycle substantially the same as the length (dimension in the rope length direction D4) W4 of the tip end portion 13c generates the tip end portion 13c. Is leaked from the rope 11.

  By the way, the length W4 of the tip portion 13c of the cut outer strand 13b is not less than the outer diameter of the outer strand 13b. For example, when the tip portion 13c projects in parallel to the radial direction of the rope 11, the length W4 of the tip portion 13c becomes the minimum and becomes substantially the same as the outer diameter of the outer wire 13b.

  Thereby, a component having a cycle smaller than the outer diameter of the outer wire 13b is highly likely to be a disturbance. Therefore, it is preferable that the component having a period smaller than the outer diameter of the outer strand 13b is removed from the Fourier series expanded function.

  The configuration of the diagnostic system 1 according to the present embodiment is as described above. Next, the diagnostic method according to the present embodiment will be described mainly with reference to FIGS. 10 to 14 (also in FIGS. 1 to 9). reference).

  First, information on the rope 11 is input to the rope information input unit 1a (rope information input step S1). For example, when the storage unit 5b stores the dimension W3 of the convex portion 11d corresponding to the outer diameter of the rope 11 and the outer diameter of the outer wire 13b, the outer portion of the rope 11 is displayed in the rope information input unit 1a. The diameter is entered.

  Then, the car 10a is moved from the state where the magnetic flux detecting unit 3 and the displacement detecting unit 4 are in contact with the rope 11 (car moving step S2), so that the magnetic flux detecting unit 3 is displaced with respect to the rope 11. At this time, the magnetic flux detection unit 3 detects the magnetic flux of the magnetized rope 11 (magnetic flux detection step S3), and the displacement detection unit 4 detects the amount of displacement of the magnetic flux detection unit 3 with respect to the rope 11 ( Displacement detection step S4).

  The magnetic flux detected by the magnetic flux detection unit 3 can be represented by a waveform composed of a time axis and a magnetic flux axis as shown in FIG. 11, and the displacement amount detected by the displacement detection unit 4 is shown in FIG. As shown, it can be represented by a waveform composed of a time axis and a displacement amount axis of the magnetic flux detection unit 3 with respect to the rope 11.

  By the way, as shown in FIG. 12, since the waveform consisting of the time axis and the displacement amount axis of the magnetic flux detection unit 3 with respect to the rope 11 is not a straight line, the moving speed of the car 10a is not the same from the start to the end of the diagnosis. Is changing. Therefore, based on the magnetic flux detected by the magnetic flux detection unit 3 and the displacement amount detected by the displacement detection unit 4, the waveform calculation unit 5c calculates a waveform composed of a rope distance axis and a magnetic flux axis, as shown in FIG. (Waveform calculation step S5).

  At this time, the position of the car 10a at the start of diagnosis and the distance between the halls X3 are input to the diagnostic information input unit 1b, whereby the position of the car 10a can be output on the rope distance axis. . The rope distance axis is the distance in the rope length direction D4 of the rope 11 and indicates the distance from the position (diagnosis start position) detected by the magnetic flux detection unit 3 at the start of diagnosis.

Then, based on the waveform calculated by the waveform calculation unit 5c, the function calculation unit 5d calculates a function by Fourier series expansion as follows (function calculation step S6).

  After that, the component removing unit 5e removes a component having a period that causes disturbance from the Fourier series expanded function (component removal step S7). At this time, the Fourier series expanded function is a function related to the rope distance axis, and thus it is possible to remove the disturbance caused by the length.

  For example, a component having a period larger than the length W2 of the magnetic coating portion 11a of the rope 11, a component having a period longer than the length W3 of the convex portion 11d of the rope 11, and a component smaller than the outer diameter of the outer wire 13b. The components and are removed from the Fourier series expanded function. The length W2 of the magnetic coating portion 11a may be input by the diagnostic information input unit 1b or may be stored in the storage unit 5b of the processing unit 5.

  Here, an example of the component removal step S7 will be described below.

First, as the removal of the first disturbance component, a component having a period larger than the length W2 of the magnetic coating portion 11a of the rope 11 is removed. For example, the total measurement distance L of the rope 11 is 20 m (= 20 × 10 ³ mm), and the length W2 of the magnetic coating portion 11a of the rope 11 is 10 mm. As a result, a component having a period larger than 10 mm (= 20 × 10 ³ mm / 2,000), which is the length W2 of the magnetic coating portion 11a of the rope 11, that is, a component having a period of n <2,000 is removed. .

Next, as a component of the second disturbance, a component having a period of length W3 or more of the convex portion 11d of the rope 11 is removed. For example, it is assumed that the diameter of the rope 11 to be diagnosed is 10 mm and the length W3 of the convex portion 11d of the rope 11 is 67.5 mm. As a result, a component having a period of 67.5 mm (≈20 × 10 ³ mm / 296.2) or more, which is the length W3 of the convex portion 11d of the rope 11, that is, a component having a period of n ≦ 296.2 is removed. .

Furthermore, as the third disturbance component removal, a component having a cycle smaller than the outer diameter of the outer strand 13b is removed. For example, it is assumed that the rope 11 to be diagnosed has a rope diameter of 10 mm and the outer wire 13b has an outer diameter of 0.66 mm. As a result, a component with a cycle smaller than the outer diameter of the outer wire 13b, which is 0.66 mm (≈20 × 10 ³ mm / 30,303.03), that is, a component with a cycle of n> 30,303.03 Remove.

このように、外乱となる周期の成分が除去される。 As a result, the component with the cycle of n <2,000, the component with the cycle of n ≦ 296.2, and the component with the cycle of n> 30, 303.03 are removed. The components of the periodic band of 2,000 ≦ n ≦ 30,303 remain. Note that A ₀ is considered to be a component with a cycle of n = 0, so A ₀ is removed.

In this way, the component of the period that becomes the disturbance is removed.

  Then, the correction waveform calculation unit 5f calculates the correction waveform, as shown in FIG. 14, based on the correction function after the component of the period that becomes the disturbance is removed (correction waveform calculation step S8). Since the function calculation step S6, the component removal step S7, and the correction waveform calculation step S8 calculate the correction waveform in which noise is removed from the waveform calculated in the waveform calculation step S5, the steps S6 to S8 are It is called the noise removal calculation step S10 as a whole.

  After that, the disconnection determination unit 5g determines the presence or absence of disconnection of the rope 11 based on the corrected waveform (disconnection determination step S9). For example, the disconnection determination unit 5g determines that the rope 11 is disconnected at the position where the magnitude of the magnetic flux exceeds the threshold value (broken line in FIG. 14). The threshold value may be input by the diagnostic information input unit 1b or may be stored in the storage unit 5b of the processing unit 5.

  In this way, since the presence or absence of disconnection of the rope 11 is determined based on the correction waveform after removing the magnetic flux that becomes the disturbance, the presence or absence of disconnection of the rope 11 can be appropriately determined. Further, since one axis of the waveform is the rope distance axis, an operation of specifying an arbitrary position of the waveform indicating the magnetic flux, for example, a position where the rope 11 is determined to be disconnected (disconnection determination position of the rope 11) Will be easier.

  For example, as shown in FIG. 14, the disconnection determination position of the rope 11 is a predetermined distance W5 away from the position of the rope 11 detected by the magnetic flux detection unit 3 when the car 10a is located on the second floor. The position. Therefore, for example, when the car 10a is located at the hall X3 on the second floor and then raised by a predetermined distance W5, the position of the rope 11 (or its peripheral position) detected by the magnetic flux detection unit 3 is confirmed. Then, the disconnection position of the rope 11 can be confirmed.

  The method for diagnosing the rope 11 is not limited to this method. For example, the rope information input step S1 is not particularly limited in order as long as it is before the component removal step S7. The waveforms according to FIGS. 11 to 14 may or may not be displayed on the output unit 1c, and, for example, the waveforms of FIGS. 11 to 14 may be displayed by the diagnostic information input unit 1b. Hidden may be selectable.

  As described above, in the method for diagnosing the elevator rope 11 according to the present embodiment, the magnetic flux detection unit 3 that detects the magnetic flux is displaced in the rope length direction D4 with respect to the magnetized elevator rope 11, and thus the rope is detected. 11 to detect the magnetic flux (S3), to detect the amount of displacement of the magnetic flux detection unit 3 with respect to the rope 11 (S4), and to detect the magnetic flux and the detected amount of displacement to determine the rope distance axis. Calculating a waveform composed of the magnetic flux axis (S5).

  Further, the diagnostic system 1 for the elevator rope 11 according to the present embodiment detects the magnetic flux detection unit 3 that detects the magnetic flux of the magnetized elevator rope 11 and the displacement amount of the magnetic flux detection unit 3 with respect to the rope 11. A displacement detection unit 4, a waveform calculation unit 5c that calculates a waveform composed of a rope distance axis and a magnetic flux axis based on the magnetic flux detected by the magnetic flux detection unit 3 and the displacement amount detected by the displacement detection unit 4. Equipped with.

  According to the diagnostic method and the diagnostic system 1 as described above, the magnetic flux of the rope 11 is detected by displacing the magnetic flux detector 3 with respect to the rope 11. Further, the amount of displacement of the magnetic flux detection unit 3 with respect to the rope 11 is detected. Then, a waveform composed of the rope distance axis and the magnetic flux axis is calculated based on the detected magnetic flux and the detected displacement amount. Accordingly, since one axis of the waveform is the rope distance axis, the work of identifying the position of the rope 11 corresponding to the arbitrary position of the waveform indicating the magnetic flux becomes easy.

  Further, the diagnostic system 1 for the elevator rope 11 according to the present embodiment is configured to include a noise removal calculator 5h that calculates a corrected waveform in which noise is removed from the waveform calculated by the waveform calculator 5c.

  According to such a configuration, after the waveform composed of the rope distance axis and the magnetic flux axis is calculated based on the detected magnetic flux, the correction waveform in which noise is removed from the waveform is calculated. This makes it possible to remove the magnetic flux that is a disturbance to determine whether or not the rope 11 is broken.

  Further, in the diagnostic system 1 for the elevator rope 11 according to the present embodiment, the magnetic flux detection unit 3 detects the leakage magnetic flux from the elevator rope 11, and the noise removal calculation unit 5h, the waveform calculation unit 5c. On the basis of the waveform calculated by the above, a function calculating section 5d for calculating a function by Fourier series expansion, a component removing section 5e for removing a component of a predetermined cycle from the function calculated by the function calculating section 5d, The component removing section 5e is provided with a corrected waveform calculating section 5f that calculates a waveform based on the function after removing the component having the predetermined period.

  According to such a configuration, after the waveform composed of the rope distance axis and the magnetic flux axis is calculated, the function by Fourier series expansion is calculated based on the waveform. Then, a component having a predetermined cycle is removed from the function, and the waveform is calculated based on the function after the removal. This makes it possible to remove the magnetic flux that is a disturbance to determine whether or not the rope 11 is broken.

  Further, the diagnostic system 1 for the elevator rope 11 according to the present embodiment includes a disconnection determination unit 5g that determines whether or not the rope 11 is disconnected based on the waveform calculated by the correction waveform calculation unit 5f. Is.

  According to such a configuration, it is determined whether or not the rope 11 is broken based on the corrected waveform. Accordingly, it is possible to determine whether or not the rope 11 is broken based on the waveform after the magnetic flux that becomes the disturbance is removed.

  The elevator rope 11 diagnosis system 1 according to the present embodiment includes a rope information input unit 1a to which information of the rope 11 to be diagnosed is input, and the component removing unit 5e includes the rope information input unit 1a. The component of the predetermined cycle is removed from the function based on the information input to the function.

  According to such a configuration, a component having a predetermined cycle is removed based on the input information on the rope 11. This makes it possible to remove the magnetic flux that is a disturbance due to the configuration of the rope 11.

  Further, in the diagnostic system 1 for the elevator rope 11 according to the present embodiment, the rope 11 includes the plurality of strands 13 that are twisted together, and thus includes the convex portion 11d that is convex outward in the radial direction, The component removing unit 5e is configured to remove a component having a cycle of a dimension W3 or more of the convex portion 11d in the rope length direction D4 from the function.

  According to such a configuration, leakage magnetic flux is generated due to the unevenness of the convex portion 11d of the rope 11, and a defect (disconnection portion) larger than the dimension W3 of the convex portion 11d in the rope length direction D4 occurs. In contrast to the low possibility, the component having a period equal to or larger than the dimension W3 of the convex portion 11d in the rope length direction D4 is removed. This makes it possible to remove the magnetic flux that causes disturbance.

  Further, in the diagnostic system 1 for the elevator rope 11 according to the present embodiment, the rope 11 includes a plurality of strands 13 that are twisted together, and the strand 13 includes a plurality of outer strands 13b that form an outer layer. The component removing unit 5e is configured to remove components having a cycle smaller than the outer diameter of the outer wire 13b with respect to the function.

  According to such a configuration, when the cut outer strand 13b protrudes outward in the radial direction of the rope 11, the dimension W4 of the protruding portion in the rope length direction D4 is outside the outer strand 13b. More than the diameter. Thereby, a component having a cycle smaller than the outer diameter of the outer wire 13b is highly likely to be a disturbance. On the other hand, a component having a cycle smaller than the outer diameter of the outer strand 13b is removed. This makes it possible to remove the magnetic flux that causes disturbance.

  Further, in the diagnostic system 1 for the elevator rope 11 according to the present embodiment, the magnetic flux detection unit 3 is arranged so as to cover the predetermined portion 11 a of the rope 11 in order to collect the leakage magnetic flux from the rope 11. A magnetic part 3g and a measuring part 3f for measuring a magnetic flux passing through the magnetic part 3g are provided, and the component removing part 5e has a dimension W2 of the predetermined part 11a in the rope length direction D4 with respect to the function. The configuration is such that a component having a period larger than that is removed.

  According to such a configuration, since the leakage magnetic flux from the predetermined portion 11a of the rope 11 is collected, the leakage magnetic flux from the predetermined portion 11a of the rope 11 can be reliably detected. On the other hand, a component having a period larger than the dimension W2 of the predetermined portion 11a of the rope 11 in the rope length direction D4 is likely to be a disturbance, whereas the component having the period is removed. This makes it possible to remove the magnetic flux that causes disturbance.

  The diagnostic system 1 and the diagnostic method for the elevator rope 11 are not limited to the configurations of the above-described embodiments, and are not limited to the above-described operational effects. Further, it is needless to say that the diagnostic system 1 and the diagnostic method for the elevator rope 11 can be variously modified without departing from the scope of the present invention. For example, it is needless to say that one or a plurality of configurations and methods according to the various modified examples described below may be arbitrarily selected and applied to the configurations and methods according to the above-described embodiments.

(1) In the diagnostic system 1 and the diagnostic method according to the above-described embodiment, the function calculator 5d is configured to calculate a function by Fourier series expansion based on the waveform calculated by the waveform calculator 5c. However, the diagnosis system 1 and the diagnosis method are not limited to such a configuration. For example, the configuration may be such that the function by Fourier series expansion is not calculated based on the waveform calculated by the waveform calculation unit 5c. That is, the diagnosis system 1 may be configured so as not to include at least one of the function calculator 5d, the component remover 5e, and the correction waveform calculator 5f.

(2) In addition, in the diagnostic system 1 and the diagnostic method according to the above-described embodiment, the displacement detecting unit 4 includes a rotating unit 4a having an outer periphery in contact with the rope 11, and a rotation detecting unit 4b detecting the amount of rotation of the rotating unit 4a. Is provided. However, the diagnosis system 1 and the diagnosis method are not limited to such a configuration.

  For example, as shown in FIG. 15, the displacement detector may include a car movement amount detector 10g. That is, the displacement detector may detect the displacement of the magnetic flux detector 3 with respect to the rope 11 by detecting the amount of movement of the car 10a. The processing unit 5 according to FIG. 15 acquires the information detected by the car movement amount detection unit 10g by the acquisition unit 5a via the elevator control unit 12.

  In addition, the processing unit 5 acquires the information detected by the car position detection unit 10f by the acquisition unit 5a. According to such a configuration, even if the position of the car 10a at the start of diagnosis or the distance between the halls X3 is unknown or is not input, the rope distance is determined in the waveform formed by the rope distance axis and the magnetic flux axis. It is possible to display the position of the rope 11 detected by the magnetic flux detecting unit 3 when the rope 11 is located at each landing X3 of the car 10a on the axis.

(3) Further, in the diagnostic system 1 and the diagnostic method according to the above-described embodiment, the disconnection determination unit 5g determines whether or not the rope 11 is disconnected based on the correction waveform calculated by the correction waveform calculation unit 5f. Is. However, the diagnosis system 1 and the diagnosis method are not limited to such a configuration. For example, the worker may determine whether or not the rope 11 is broken based on the correction waveform calculated by the correction waveform calculation unit 5f. That is, the worker may determine whether or not the rope 11 is broken by looking at the waveform displayed on the output unit 1c.

(4) In addition, in the diagnostic system 1 and the diagnostic method according to the above-described embodiment, the component removing unit 5e includes the component having a period larger than the length W2 of the magnetic coating portion 11a (magnetic portion 3g) and the convex portion of the rope 11. The configuration is such that a component having a period of length W3 or more of the portion 11d and a component having a period smaller than the outer diameter of the outer wire 13b are removed. However, the diagnosis system 1 and the diagnosis method are not limited to such a configuration.

  For example, the component removing unit 5e may be configured to remove a component having a period larger or smaller than other dimensions of the rope 11. Further, the component removing unit 5e may be configured to remove components having a cycle other than the set cycle band. Such a period band may be set by deriving a component of a period that causes disturbance based on the results of a plurality of experiments.

(5) Further, in the diagnostic system 1 and the diagnostic method according to the above-described embodiment, the magnetic flux detection unit 3 is configured to include the magnetic unit 3g. However, the diagnosis system 1 and the diagnosis method are not limited to such a configuration. For example, the magnetic flux detection unit 3 may be configured not to include the magnetic unit 3g.

(6) Further, in the diagnostic method according to the above embodiment, the diagnostic tool 2 is fixed, and the magnetic flux detection unit 3 is displaced with respect to the rope 11 by moving the car 10a. However, the diagnostic method is not limited to such a configuration. For example, a method may be used in which the magnetic flux detection unit 3 is displaced with respect to the rope 11 when the diagnostic tool 2 is gripped and moved with respect to the rope 11 while the car 10a is stopped.

(7) Further, in the diagnostic system 1 and the diagnostic method according to the above-described embodiment, the noise removal calculator 5h calculates a function by Fourier series expansion of the waveform, removes a component having a predetermined period, and then corrects the waveform. The calculation is performed. However, the diagnosis system 1 and the diagnosis method are not limited to such a configuration. That is, the noise removal calculation unit 5h is not particularly limited as long as it can remove noise.

  For example, even if the magnetic flux method is adopted and the magnetic flux detection unit 3 detects the magnetic flux passing through the inside of the magnetized rope 11, the noise removal calculation unit 5h calculates the function by Fourier series expansion of the waveform. The configuration may be such that the correction waveform is calculated after removing the component having a predetermined period, and is not particularly limited. For example, when the magnetic flux detection unit 3 always detects a certain amount of noise magnetic flux depending on the surrounding environment, the noise removal calculation unit 5h may be configured to remove the certain amount of magnetic flux as noise.

  DESCRIPTION OF SYMBOLS 1 ... Diagnostic system, 1a ... Rope information input part, 1b ... Diagnostic information input part, 1c ... Output part, 2 ... Diagnostic tool 2a ... Diagnostic tool main body, 3 ... Magnetic flux detection part, 3a ... Detection part main body, 3b ... Connection Parts, 3c ... elastic part, 3d ... permanent magnet, 3e ... yoke, 3f ... measuring part, 3g ... magnetic part, 3h ... guide part, 3i ... non-magnetic part, 3j ... end part, 3k ... connecting part, 4 ... displacement Detection unit, 4a ... Rotation unit, 4b ... Rotation detection unit, 4c ... Connection unit, 4d ... Elastic unit, 5 ... Processing unit, 5a ... Acquisition unit, 5b ... Storage unit, 5c ... Waveform calculation unit, 5d ... Function calculation unit 5e ... Component removing section, 5f ... Correction waveform calculating section, 5g ... Disconnection judging section, 5h ... Noise removing calculating section, 10 ... Elevator, 10a ... Car, 10b ... Counterweight, 10c ... Sheave, 10d ... Hoisting Machine, 10e ... movement information input section, 10f ... car position detection section, 10g ... car movement detection , 11 ... Rope, 11a ... Magnetic coating part, 11b ... Disconnection part, 11c ... Core material, 11d ... Convex part, 12 ... Elevator control part, 12a ... Acquisition part, 12b ... Storage part, 12c ... Car position calculation part, 12d ... Winding control section, 13 ... Strand, 13a ... Inner wire, 13b ... Outer wire, 13c ... Tip, X1 ... Machine room, X2 ... Hoistway, X3 ...

Claims (5)

A magnetic flux detection unit that detects the magnetic flux of the magnetized elevator rope,
A displacement detector that detects the amount of displacement of the magnetic flux detector with respect to the rope;
A diagnostic system for an elevator rope, comprising: a waveform calculation unit that calculates a waveform composed of a rope distance axis and a magnetic flux axis based on a magnetic flux detected by the magnetic flux detection unit and a displacement amount detected by the displacement detection unit. .   A diagnostic system for an elevator rope, comprising: a noise removal calculator that calculates a corrected waveform in which noise is removed from the waveform calculated by the waveform calculator. The magnetic flux detection unit detects the leakage magnetic flux from the elevator rope,
The noise removal calculation unit,
Based on the waveform calculated by the waveform calculation unit, a function calculation unit for calculating a function by Fourier series expansion,
A component removing unit that removes a component having a predetermined period from the function calculated by the function calculating unit,
The elevator rope diagnostic system according to claim 2, further comprising: a correction waveform calculator that calculates a waveform based on a function after the component remover removes the component having the predetermined period.   The elevator rope diagnostic system according to claim 2 or 3, further comprising a disconnection determination unit that determines whether or not the rope is disconnected based on the correction waveform calculated by the noise removal calculation unit. A magnetic flux detection unit for detecting magnetic flux, by displacing in the rope length direction with respect to the magnetized elevator rope, and detecting the magnetic flux of the rope,
Detecting the amount of displacement of the magnetic flux detector with respect to the rope,
A method of diagnosing an elevator rope, comprising: calculating a waveform composed of a rope distance axis and a magnetic flux axis based on the detected magnetic flux and the detected displacement amount.

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