JP2022091389A - Rope inspection system for elevator - Google Patents

Abstract

To enable measurement of a mark interval to be continued even when mark missing occurs and to carry out highly reliable strength management by determining rope elongation on the basis of the measurement result.SOLUTION: A rope inspection system for an elevator comprises a rope suspending a car and a counter weight 21 via a traction sheave 22 of a hoist and having structure the surface of which is covered with resin, and intervals between a plurality of marks provided at fixed intervals on the surface of the rope are measured. The rope inspection system has a reference value of mark intervals for the rope, and comprises control means for determining measurement results to be valid when the mark intervals acquired as the measurement results are within the permissible range defined by an integral multiple of the reference value, and determining rope elongation from the measurement results.SELECTED DRAWING: Figure 1

Description

Embodiments of the present invention relate to an elevator rope inspection system.

Machine roomless type elevators that save space by accommodating elevator equipment such as hoisting machines in the hoistway are becoming common. In the machine roomless type elevator, the sheave (traction sheave) of the hoist is downsized. Therefore, as a main rope that is resistant to bending fatigue and has a high-strength rope structure, a wire rope in which the surface of a tensile strength member is coated with a resin material having wear resistance and a high coefficient of friction such as polyurethane is used.

In this type of wire rope, the internal tensile strength member cannot be visually checked, and unlike a general wire rope, the strength cannot be controlled by visually inspecting the wear state of the wire and the number of broken wires. Therefore, a rope inspection system that marks the surface of the rope at substantially constant intervals and measures the mark interval with respect to the feed amount of the rope as the rope elongation, and determines the deterioration state from the measurement results and manages the strength. Has been proposed.

Japanese Patent No. 6271680

The above-mentioned mark is optically detected by the photoelectric sensor while the rope is moving. However, due to the usage environment of the rope and deterioration over time, a part of each mark on the rope cannot be detected by the photoelectric sensor. This state is called "mark defect". In such a case, the deterioration state (rope elongation) of the rope cannot be correctly determined from the measurement result of the mark interval, so there is no choice but to replace the rope.

If a plurality of photoelectric sensors are arranged for one rope, the mark detection rate becomes high, so that mark loss can be prevented. However, it is difficult to arrange a plurality of photoelectric sensors in the limited space in the hoistway, and it also leads to an increase in the cost of the system.

The problem to be solved by the present invention is an elevator capable of continuously measuring the mark interval even when a mark defect occurs, determining lobe elongation from the measurement result, and performing highly reliable strength management. To provide a rope inspection system.

The rope inspection system according to one embodiment is provided with a rope having a structure in which a car and a counter weight are suspended via a traction sheave of a hoist and a surface thereof is coated with a resin, and is constant on the surface of the rope. Measure the spacing between multiple marks provided at intervals.

The elevator rope inspection system includes a sensor, a mark detecting means, a mark interval calculating means, and a control means. The sensor is provided in the vicinity of the rope. The mark detecting means detects the position of each mark based on the signal output from the sensor and the data indicating the ascending / descending position of the car as the rope moves. The mark interval calculating means calculates the mark interval based on the position of each mark detected by the mark detecting means. The control means has a reference value of the mark spacing with respect to the rope, and the mark spacing obtained as a measurement result by the mark spacing calculation means is within an allowable range defined by an integral multiple of the reference value. The measurement result is valid, and the rope elongation is judged from the measurement result.

FIG. 1 is a diagram showing a schematic configuration of an elevator according to the first embodiment. FIG. 2 is a cross-sectional view showing the structure of the main rope used for the elevator in the same embodiment. FIG. 3 is a perspective view showing the appearance of the main rope used for the elevator in the same embodiment. 4A and 4B are diagrams for explaining the relationship between the pulse signal and the mark interval in the same embodiment, FIG. 4A is a pulse signal output in synchronization with the movement of the main rope, and FIG. 4B is installation. The time mark interval and the figure (c) are the mark intervals when the rope is stretched due to aging. FIG. 5 is a diagram showing the relationship between the elongation rate and the residual strength due to deterioration of the rope in the same embodiment. FIG. 6 is a diagram for explaining a method of measuring the mark interval using the sensor in the same embodiment, FIG. 6A shows the output voltage of the sensor, and FIG. 6B shows the output voltage of the sensor and the mark position. It is a figure which shows the relationship of. FIG. 7 is a diagram showing an example of the calculation result of the mark interval in the same embodiment, and shows the calculation result of the mark interval when there is no mark defect. FIG. 8 is a diagram showing an example of the calculation result of the mark interval in the same embodiment, and shows the calculation result of the mark interval when a mark defect occurs in one place. FIG. 9 is a diagram showing an example of the calculation result of the mark interval in the same embodiment, and shows the calculation result of the mark interval when the mark defect occurs continuously. FIG. 10 is a flowchart for explaining the processing operation of the main routine of the rope inspection system in the same embodiment. FIG. 11 is a flowchart for explaining the length measurement operation process included in the main routine. FIG. 12 is a flowchart for explaining the mark detection process included in the main routine. FIG. 13 is a flowchart for explaining the mark interval calculation process included in the main routine. FIG. 14 is a flowchart for explaining the mark interval calculation process included in the main routine. FIG. 15 is a diagram for explaining the threshold voltage adjusting method in the second embodiment, and is a diagram showing a threshold voltage adjusting method when the number of detected marks is small. FIG. 16 is a diagram for explaining the threshold voltage adjusting method in the second embodiment, and is a diagram showing a threshold voltage adjusting method when the number of detected marks is large. FIG. 17 is a flowchart for explaining the mark detection process in the second embodiment. FIG. 18 is a flowchart for explaining the mark detection process in the second embodiment. FIG. 19 is a flowchart for explaining the mark detection process in the third embodiment. FIG. 20 is a flowchart for explaining the mark detection process in the third embodiment.

Hereinafter, embodiments will be described with reference to the drawings.

First, before carrying out the embodiment of the present invention, the relationship between the elongation rate and the strength of the rope will be described with reference to FIG.

For example, in a wire rope used for an elevator main rope or the like, a strand and a core rope, which are tensile strength members, are squeezed by tension and rub against each other by bending received from a sheave or the like. For this reason, the form of rope deterioration is dominated by wear and disconnection of the strands in the vicinity of the core rope. Due to the deterioration of this portion, the strand moves in the direction of the core rope (the direction in which the rope diameter decreases), so that the rope structure is stretched.

As a result of verification of a wire rope having such a structure, it was found that there is a correlation between the elongation rate and the strength as shown in FIG. In FIG. 5, the horizontal axis represents the elongation rate of the rope. Although specific numerical values are omitted for confidentiality purposes, λ in the figure is about several percent, and the distance is about several mm. The vertical axis represents the strength ratio of the rope (this is called the residual strength ratio). As the rope gradually grows from a new state at the time of installation due to deterioration over time, its strength also decreases. Normally, the strength rate of 80% is set as the reference strength, and safety can be obtained by setting the time when the elongation rate of the rope reaches λ as the replacement time.

The rope elongation is measured by feeding a fixed amount of rope by inspection operation, detecting a plurality of marks on the surface of the rope with a sensor during that period, and counting the pulse signal of the encoder at the detection timing.

As a method of generating a pulse signal for mark measurement, for example, when a rotary encoder in which a rotating member is brought into contact with a guide rail is used, the number of pulses for a certain rope feed amount varies due to steps and deposits at the rail joint. Therefore, an error is likely to occur in the measurement of the mark interval. There is also a method of providing an encoder in the governor, but it requires an extra space including an inspection work space.

Therefore, consider using an encoder for rotation control of the hoist that synchronizes with the rotation of the traction sheave. If this encoder is used, the speed governor does not require an extra space like an encoder, and the cost can be reduced.

However, due to the rope usage environment and deterioration over time, the reflectance of the mark portion decreases, the output of the mark detection means decreases, mark defects occur at a certain mark detection threshold, and mark interval measurement becomes impossible. Here, it is possible to compensate for the mark detection by providing a plurality of mark detection means, but it leads to an increase in the cost of the system. Further, when an inexpensive photo / micro sensor is used as the mark detecting means, an output difference occurs due to an individual difference of the sensor, and at a certain mark detection threshold value, mark defects frequently occur and the mark interval cannot be measured. If a high-precision sensor with a small output difference is used as a countermeasure, the cost will be further increased.

In the following, a method for continuing the measurement of the mark interval without impairing the measurement accuracy even if a mark defect occurs will be described in detail.

(First Embodiment)
FIG. 1 is a diagram showing a schematic configuration of an elevator according to the first embodiment. In the example of FIG. 1, a machine roomless type elevator having no machine room is assumed.

The car 20 and the counterweight 21 are supported by guide rails 11 and 12 erected in the hoistway 10 so as to be able to move up and down. Further, a hoisting machine 23 having a traction sheave 22 is installed above the hoistway 10. The car 20 and the counterweight 21 are suspended in the hoistway 10 by a plurality of main ropes 24. Note that FIG. 1 shows only one main rope 24, and the other main ropes 24 are not shown.

Both ends of the main rope 24 are fixed to the upper ends of the hoistway 10 via rope hitches 25a and 25b, respectively. Further, the main rope 24 is continuously wound around the car sheave 26, the traction sheave 22 and the counterweight sheave 27 in the middle portion. As a result, the car 20 and the counterweight 21 are supported in a 2: 1 low pink format. When the traction sheave 22 is rotated by the drive of the hoisting machine 23, the car 20 and the counterweight 21 move up and down in the hoistway 10 via the main rope 24 as the traction sheave 22 rotates.

In a machine roomless type elevator without a machine room, the hoisting machine 23 is installed in the hoistway 10, but the present invention is not particularly limited to this configuration, and is an elevator having a machine room. You may. In an elevator having a machine room, the hoisting machine 23 is installed in the machine room. Further, the roping is not limited to the 2: 1 roping as shown in FIG. 1, and other methods such as 1: 1 roping may be used.

Here, the rope inspection system of the present embodiment includes a sensor 28, an encoder 29, an arithmetic unit 30, a display device 31, and a control panel 40.

The sensor 28 is installed near the main rope 24 to be inspected, and optically detects a plurality of marks 45 (see FIG. 3) provided at regular intervals in the longitudinal direction of the main rope 24. The encoder 29 generates a pulse signal in synchronization with the rotation of the traction sheave 22. The encoder 29 is an existing encoder built into the elevator to detect the car position and speed. By using this encoder 29 for measuring the mark interval, it is possible to avoid layout inconvenience, which is a problem in a configuration in which an encoder is installed in a speed governor, for example.

The arithmetic unit 30 samples the output voltage of the sensor 28 at regular intervals and stores it in the memory 30a, and also counts the pulse signal generated by the encoder 29 and stores it in the memory 30a. Since the main rope 24 is actually composed of a plurality of ropes, the arithmetic unit 30 stores the output voltage of the sensor 28 and the count value of the pulse signal in the memory 30a at regular intervals for each rope.

The arithmetic unit 30 detects the position of each mark 45 based on the output voltage V and the threshold voltage Vs of the sensor 28 stored in the memory 30a, and calculates the mark interval from the count value of the pulse signal generated by the encoder 29. It has a function. Further, the arithmetic unit 30 has a function of obtaining the amount of elongation of the main rope 24 from the mark interval. The display device 31 displays the mark interval, the rope elongation amount, and the like obtained by the arithmetic unit 30. The arithmetic unit 30 and the display device 31 are composed of a general-purpose computer. The function of the arithmetic unit 30 may be provided in the control panel 40, and a series of processes related to the measurement of the mark interval may be performed only by the control panel 40.

The control panel 40 is a control device for controlling the entire elevator including the drive control of the hoisting machine 23. The control panel 40 detects the position of the car 20 based on the pulse signal of the encoder 29, and performs control such as moving the car 20 to the target floor at a predetermined speed. In the present embodiment, the arithmetic unit 30 is connected to the control panel 40, and the arithmetic unit 30 is configured to acquire the pulse signal of the encoder 29 from the control panel 40.

The control panel 40 is connected to the monitoring center 51 via the communication network 50. The monitoring center 51 remotely monitors the state of the elevators of each property to be monitored via the communication network 50, and dispatches maintenance personnel to the site when any abnormality occurs. The maintenance staff possesses a terminal device 52 for maintenance and inspection. The terminal device 52 is provided with a function of performing wireless communication with the control panel 40 and the monitoring center 51.

Reference numeral 32 in the figure is a landing detection member. The landing detection member 32 is also called a “landing inspection plate” and is provided in the hoistway 10 for each floor along the ascending / descending direction of the car 20. The landing detection member 32 is used to detect the stop position in conjunction with the non-contact switch 33 when the car 20 stops on each floor.

Here, the structure of the main rope 24 will be described with reference to FIGS. 2 and 3.
As the main rope 24, a resin-coated wire rope is used. As shown in FIG. 2, the main rope 24 includes a rope main body 41 as a tensile strength member and an outer covering layer 42 that completely covers the rope main body 41 as main elements.

The rope body 41 is formed by twisting a plurality of steel strands 43 at a predetermined pitch. The outer coating layer 42 is made of a thermoplastic resin material having wear resistance and a high coefficient of friction, such as polyurethane. The outer coating layer 42 has an outer peripheral surface 44a that defines the outer surface of the main rope 24. The outer peripheral surface 44a has a circular cross-sectional shape, and when it is wound around the sheaves 22, 26, 27, it comes into contact with each other with friction.

Further, the resin material forming the outer coating layer 42 is filled in the gap between the adjacent strands 43. Therefore, the outer covering layer 42 has a plurality of filling portions 44 that enter between the strands 43 adjacent to each other in the circumferential direction of the rope main body 41. The filling portion 44 is located inside the outer peripheral surface 44a of the outer coating layer 42.

As shown in FIG. 3, a plurality of marks 45 are provided on the surface of the main rope 24 (that is, the outer peripheral surface 44a of the outer coating layer 42). These marks 45 are elements for detecting the amount of elongation due to deterioration of the main rope 24, and are arranged at regular intervals (for example, 500 mm intervals) in the longitudinal direction over the entire length of the main rope 24. Each of these marks 45 is formed by a continuous straight line or an intermittent dotted line in the circumferential direction of the main rope 24.

By the way, in the main rope 24, the gap between the strands 43 and the gap between the plurality of strands constituting the strand 43 decrease with the lapse of the period of use. As a result, the strands 43 and the strands repeatedly rub against each other, and the strands 43 and the strands are worn and broken.

In particular, the portion where the main rope 24 comes into contact with the sheaves 22, 26, 27 is repeatedly subjected to friction. Therefore, the degree of progress of wear / disconnection of the main rope 24 is larger than that of the portion where the main rope 24 does not pass through the sheaves 22, 26, 27, which causes the rope diameter to decrease or local elongation to occur. Therefore, the strength of the main rope 24 can be managed by clarifying the relationship between the rope elongation and the strength reduction rate and detecting the elongation of the portion of the main rope 24 where the deterioration is maximum.

The sensor 28 is fixed so as to face the main rope 24 in the vicinity of the hoist 23, for example. As a result, when the car 20 is moved up and down between the top floor and the bottom floor during inspection operation, most of the total length of the main rope 24 passes through the sensor 28 except for the parts near the rope hitches 25a and 25b. The mark 45 can be continuously detected when passing.

The sensor 28 is preferably configured by a photoelectric sensor using laser reflected light in view of responsiveness, but may be configured by a photo / micro sensor using cheaper LED reflected light or the like. In recent years, commercially available photoelectric sensors have become widespread by irradiating an object with laser light or the like and detecting a change in surface color (reflectance) due to a difference in reflected light intensity (reflectance).

Since the encoder 29 outputs a pulse signal in synchronization with the movement of the car 20, the pulse output is substantially corresponding to the rope feed amount. When installing the elevator, marks 45 are arranged at equal intervals in the longitudinal direction of the main rope 24. Therefore, when there is no elongation due to deterioration of the main rope 24, the count value of the pulse signal is substantially the same as the reference value corresponding to the mark interval at the time of installation. On the other hand, when the main rope 24 is stretched due to deterioration of the main rope 24, the count value of the pulse signal exceeds the reference value corresponding to the mark interval at the time of installation.

This situation is shown in FIG.
4A and 4B are for explaining the relationship between the pulse signal and the mark interval, FIG. 4A is a pulse signal output in synchronization with the movement of the main rope 24, and FIG. 4B is a mark interval at the time of installation. FIG. 3C shows the mark interval when the rope is stretched due to aged deterioration.

Assuming that the reference value when the pulse signal is counted at the mark interval at the time of installation is n pulse, if the main rope 24 is not deteriorated, the count value obtained by the inspection operation is slightly different from the n pulse at the time of installation. It is almost the same including. However, when the main rope 24 is in a stretched state due to deterioration, the count value obtained in the inspection operation becomes larger than the n pulse corresponding to the mark interval at the time of installation.

Here, the measurement of the mark interval will be described with reference to FIG.
FIG. 6 is a diagram for explaining a method of measuring the mark interval using the sensor 28, FIG. 6A shows the output voltage of the sensor 28, and FIG. 6B shows the output voltage of the sensor 28 and the mark position P. It is a figure which shows the relationship of.

Now, it is assumed that the main rope 24 is being fed in the direction of arrow A shown in FIG. The sensor 28 has an analog voltage output function, and outputs an output voltage V according to the reflectance of the non-marked portion and the marked portion of the main rope 24. The output voltage V of the sensor 28 and the integrated number of pulses obtained by integrating the pulses output from the encoder 29 are stored in the memory 30a of the arithmetic unit 30 at regular intervals. The output voltage V stored in the memory 30a and the threshold voltage Vs are compared. Then, at the rising timing when the output voltage V exceeds the threshold voltage Vs, the elevating position obtained by multiplying the integrated number of pulses counted during that time by the pulse rate is obtained as the mark positions P1, P2, P3 ... Pn, and the memory 30a is obtained. Sequentially memorize in. As a result, the elevating position and the mark interval of the car 20 are obtained as the following equations (1) and (2a) to (2c).

Elevating position = total number of pulses x pulse rate ... (1)
Mark interval L1 = | P1-P2 | ... (2a)
Mark interval L2 = | P2-P3 | ... (2b)
Mark interval Ln-1 = | Pn-1-Pn | ... (2c)

7 to 9 show an example of the calculation result of the mark interval.
FIG. 7 shows the calculation result of the mark interval when there is no mark defect. FIG. 8 shows the calculation result of the mark interval when a mark defect occurs in one place. FIG. 9 shows the calculation result of the mark interval when mark defects occur continuously.

Now, it is assumed that a plurality of marks 45 are provided at intervals of 500 mm in the longitudinal direction of the main rope 24 when the elevator is installed. In this case, the reference value of the mark spacing is set to 500 mm. If each mark 45 on the main rope 24 is correctly detected by the sensor 28, the mark interval is calculated to be approximately 500 mm as shown in FIG.

Here, a state in which a part of each mark 45 is not detected by the sensor 28, that is, a mark defect may occur due to aged deterioration or the like. As shown in FIG. 8, if there is one mark defect, the mark interval corresponding to the defect portion is approximately twice as large as 500 mm. As shown in FIG. 9, if there are three consecutive mark defects, the mark spacing corresponding to the defect locations is approximately four times as large as 500 mm. Therefore, it can be seen that when the mark is missing, the mark interval becomes longer by an integral multiple of the reference value.

Further, since the rope movement distance is determined for each property, the expected number of mark detections per rope can be obtained by dividing the rope movement distance by the reference value of the mark interval. By giving a likelihood to this expected number, the expected range of the number of mark detections obtained at the time of measurement is defined as follows.

Small number of detections <Expected range <Large number of detections The small number of detections is set to be slightly smaller than the expected number of mark detections in consideration of measurement error at the time of mark detection. The large number of detections is set to be slightly larger than the expected number of mark detections in consideration of measurement error at the time of mark detection.

The operation of this system will be described in detail below by dividing it into (a) main routine, (b) length measurement operation processing, (c) mark detection processing, and (d) mark interval calculation processing.

(A) Main Routine FIG. 10 is a flowchart for explaining the processing operation of the main routine of the rope inspection system according to the first embodiment, and is for automatically measuring the interval between a plurality of marks 45 attached to the main rope 24. Shows the overall flow of. The process shown in this flowchart is mainly executed by the control panel 40.

Since the main rope 24 is actually composed of a plurality of ropes, the mark interval is measured for each rope. In the following, for the sake of simplicity, the process of measuring the mark spacing for any one rope included in the main rope 24 will be described.

First, as an initial setting, the control panel 40 sets various conditions related to the measurement of the mark interval, including, for example, an ascending / descending range and an operating speed (step S101). The mark interval measurement is performed after the driving service for the elevator user is completed, for example at night. The control panel 40 moves the car 20 up and down at a predetermined speed by driving the hoisting machine 23, and performs a length measurement operation process while feeding the main rope 24 in one direction (step S102). By this length measurement operation process, the integrated value (integrated pulse number) of the signal (voltage V) output from the sensor 28 and the pulse signal output from the encoder 29 is calculated by the arithmetic unit 30 as the main rope 24 moves. It is stored in the memory 30a at regular intervals. Details will be described later with reference to FIG.

When the operation of the car 20 is temporarily stopped for some reason and the length measurement operation process is not normally completed (No in step S102), the control panel 40 updates the value of the retry counter RC (step S103). .. The retry counter RC is a counter for counting the number of retries in the measurement operation process, and is provided in the control panel 40. The same applies to various counters described later, which are provided in the control panel 40.

The retry counter RC is provided in order to avoid repeating the measurement operation process many times. The limit value for the value (number of retries) of the retry counter RC is predetermined. If the value of the retry counter RC is within the predetermined limit (No in step S104), the control panel 40 re-executes the length measurement operation process (step S200). If the value of the retry counter RC is out of the limitation (Yes in step S104), the control panel 40 sets a retry abnormality (step S105) and issues a retry abnormality to a predetermined alarm destination (step S109). .. The "predetermined alarm destination" includes a terminal device 52 owned by a maintenance person, a monitoring center 51 at a remote location, and the like.

When the length measurement operation process is normally completed (Yes in step S102), the control panel 40 executes the mark detection process through the arithmetic unit 30 (step S300). In this mark detection process, the signal (voltage V) output from the sensor 28 and the data (cumulative pulse number) indicating the ascending / descending position of the car 20 are used to determine the position of each mark 45 attached on the main rope 24. , The number of each mark 45 (mark detection number) is obtained. Details will be described later with reference to FIG.

When the number of mark detections is abnormal (No in step S106), the control panel 40 invalidates the measurement result (mark detection position) and cancels the mark interval calculation process. At that time, the control panel 40 issues an abnormality in the number of detected marks to the predetermined alarm destination (step S109).

When the number of marks detected is normal (Yes in step S106), the control panel 40 executes the mark interval calculation process (step S400). In this mark interval calculation process, the mark interval is calculated based on the mark position detected in step S300. Details will be described later with reference to FIGS. 13 and 14.

When it is set that the mark interval is normal in the mark interval calculation process of step S400 (Yes in step S107), the control panel 40 makes the measurement result of the mark interval valid, and ropes from the measurement result. Judge the growth. At that time, the control panel 40 notifies the predetermined reporting destination that the measurement has been performed normally (step S108). On the other hand, when there is an abnormality in the mark interval (No in step S107), the control panel 40 invalidates the measurement result of the mark interval and notifies the predetermined notification destination of the abnormality in the mark interval (step S109). ).

(B) Length measuring operation process FIG. 11 is a flowchart for explaining the length measuring operation process executed in step S200 of FIG.

As an initial setting, the control panel 40 sets various conditions related to the length measurement operation process, including, for example, a length measurement start position and a length measurement end position (step S201). The control panel 40 moves the car 20 to the length measurement start position (for example, the lowest floor), and then instructs the arithmetic unit 30 to start the length measurement operation (step S202).

When the car 20 moves from the length measurement start position at a predetermined operating speed, a pulse signal is output from the encoder 29 and given to the arithmetic unit 30 via the control panel 40. Further, a voltage signal corresponding to the surface reflection of the main rope 24 is output from the sensor 28. This voltage signal is given to the arithmetic unit 30 as digital data via an A / D converter (not shown).

Here, during the length measurement operation, the arithmetic unit 30 calculates the integrated number of pulses of the encoder 29 corresponding to the elevating position of the car 20, and the output voltage V (digital data) of the sensor 28 is stored in the memory 30a at regular intervals. Is stored in (step S203). If the car 20 has not arrived at the length measurement end position (for example, the top floor) (No in step S204), the control panel 40 performs a predetermined standby process (step S205).

When the car 20 arrives at the length measurement end position and the length measurement operation process is normally completed (Yes in step S206), the control panel 40 performs the length measurement operation process after the normal end setting is made (step S207). Finish. On the other hand, if the length measurement operation process is not normally completed for some reason (No in step S206), the control panel 40 ends the length measurement operation process after setting the abnormal end (step S208).

As described with reference to FIG. 10, when the length measuring operation process is not normally completed, the length measuring operation process is re-executed within the predetermined limit. When the length measurement operation process is completed normally, the mark detection process described later is executed.

(C) Mark detection process FIG. 12 is a flowchart for explaining the mark detection process executed in step S300 of FIG.

As an initial setting, the control panel 40 sets various conditions related to the mark detection process, such as an expected range of the number of mark detections for the ascending / descending range (step S301). The mark detection process is executed through the arithmetic unit 30 under the control of the control panel 40.

The arithmetic unit 30 detects the position of the mark 45 attached to the main rope 24 by comparing the output voltage V of the sensor 28 stored in the memory 30a at a fixed cycle with the preset threshold voltage Vs. Specifically, the arithmetic unit 30 obtains a rise time or an array index of the voltage signal when the output voltage V exceeds the threshold voltage Vs, and obtains the integrated pulse number of the encoder 29 corresponding to the rise time or the array index from the memory 30a. Extract. Then, the arithmetic unit 30 obtains the elevating position obtained by multiplying the integrated number of pulses by the pulse rate as the position of the mark 45, and stores it in the memory 30a (step S302).

Further, the arithmetic unit 30 updates the number of mark detections every time the position of the mark 45 is detected and stores it in the memory 30a (step S303). The arithmetic unit 30 repeats the calculation of the mark position and the update of the mark detection number described above until the data to be detected is completed (No in step S304).

After the data is completed, the control panel 40 acquires the mark detection number from the arithmetic unit 30 and determines whether or not the mark detection number is within the predetermined expected range (step S305). If each mark 45 on the main rope 24 can be detected, the number of mark detections is within the expected range. However, if a part of each mark 45 cannot be detected due to deterioration over time, or if erroneous detection occurs due to the influence of noise, the number of mark detections is out of the expected range.

If the number of mark detections is within the expected range (Yes in step S305), the control panel 40 ends the mark detection process after setting that the number of mark detections is normal (step S306). On the other hand, when the number of mark detections is less than the expected range (Yes in step S307), the control panel 40 ends the mark detection process after setting an abnormality with a small number of mark detections (step S308). When the number of mark detections is larger than the expected range (No in step S307), the control panel 40 finishes the mark detection process after setting an abnormality with a large number of mark detections (step S309).

In FIG. 12, a sequence is used in which the number of mark detections is determined after the data is completed. For example, when the number of mark detections is updated, it is determined whether or not the number of mark detections is at least larger than the expected range of mark detection. If the number of mark detections is larger than the expected range of mark detection, the mark detection process may be terminated after setting an abnormality. As a result, the capacity of the memory 30a for storing the mark position and unnecessary processing time can be suppressed. Further, it is desirable that this mark detection process be performed for each sensor 28 used for each rope constituting the main rope 24.

By determining the number of mark detections in this way, it is possible to perform the mark interval calculation process described later for at least the main rope 24 whose number of mark detections is within the expected range. On the other hand, with respect to the main rope 24 whose number of marks detected was out of the expected range, it is considered that the reflectance of the mark 45 is lowered, dust in the hoistway, and concrete dust in the road are adhered. Therefore, by issuing an abnormality notification, it is possible to take measures such as detailed inspection of the main rope 24 and cleaning instructions.

(D) Mark interval calculation process FIGS. 13 and 14 are flowcharts for explaining the mark interval calculation process executed in step S400 of FIG.

As an initial setting, the control panel 40 sets, for example, a reference value and an allowable range of the mark interval, and initializes various counters MC1 to MC4 regarding the mark interval (step S401).

The mark interval calculation process is executed through the arithmetic unit 30 under the control of the control panel 40. The arithmetic unit 30 calculates the mark interval based on the position of each mark 45 obtained in the mark detection process (step S402). The control panel 40 reads the mark interval data calculated by the arithmetic unit 30 and performs the following determination process.

That is, first, the control panel 40 determines whether or not the mark interval read from the arithmetic unit 30 is within a predetermined normal range with respect to the reference value (step S403). If the mark interval is within the normal range (Yes in step S403), the control panel 40 determines that the mark interval is valid, and updates the value of the mark interval normal counter MC1 (step S404).

For example, if the output voltage V of the sensor 28 contains noise of the threshold voltage Vs or more, the position of the mark 45 may be erroneously detected due to the influence of the noise, and the mark interval may be shorter than the normal range. Therefore, when the mark interval read from the arithmetic unit 30 is shorter than the normal range (Yes in step S405), the control panel 40 invalidates the mark interval and updates the value of the mark interval small counter MC2 (step). S406).

Further, when a part of each mark 45 cannot be detected, that is, when a mark is missing, the mark interval becomes longer than the normal range. Generally, when there is a mark defect, the measurement process of the mark interval is stopped, but in the present embodiment, the mark is newly set for the recovery at the time of the mark defect. Realize the continuation of the interval measurement process. As will be described later, this permissible range Ltemp is set by paying attention to the fact that mark defects occur in integer multiples of the reference value.

If the mark interval read from the arithmetic unit 30 is within the allowable range Ltemp (Yes in step S407), the control panel 40 determines that the mark interval is valid and updates the value of the mark loss counter MC3 (step S408). ). On the other hand, if the mark interval read from the arithmetic unit 30 is outside the allowable range Ltemp (No in step S407), the control panel 40 determines that the mark interval is invalid and updates the value of the mark interval large counter MC4. (Step S409).

Here, the allowable range Ltemp will be described in detail.
From the above formulas (2a) to (2c), the mark spacing is obtained based on the mark position. This mark interval is displayed on the display device 31 and is sequentially stored in the memory 30a in the arithmetic unit 30 in an array as shown in FIG. 7. The control panel 40 determines whether or not the mark interval is within the allowable range Ltemp defined as follows.

・ Tolerance range Ltemp
The reference value of the mark interval is Lb. Assuming that the permissible value of the contraction side mark interval with respect to the reference value Lb is Δm and the permissible value of the extension side mark interval is Δp, the permissible range Ltemp can be expressed by the following equation (3).

M × (Lb−Δm) <Ltemp <M × (Lb + Δp)… (3)
However, 1 ≦ M ≦ Mmax, M is a positive integer, and Mmax is a predetermined maximum value.

That is, the allowable range Ltemp is defined by M times the reference value Lb (for example, 500 mm) of the mark interval. The lower limit of the allowable range Ltemp is a value obtained by subtracting the first allowable value Δm from the reference value Lb and multiplying it by M. The upper limit of the allowable range Ltemp is a value obtained by multiplying the reference value Lb by the value obtained by adding the second allowable value Δp.

The permissible values Δm and Δp are arbitrarily set within the range of measurement error, and may be the same value or different values. The minimum value of M is 1, and the maximum value of M (Mmax) is 5 to 10. The maximum value Mmax is set so that the mark interval at the time of mark loss is within the first floor floor due to the relationship between the rope movement distance and the floor interval.

For example, in the case of the main rope 24 provided in a building having an ascending / descending stroke of 100 m, the moving distance of the main rope 24 is 200 m in the case of the 2: 1 roving type as shown in FIG. Further, the floor spacing of the building to which the main rope 24 is applied is generally about 4 m. Considering the movement distance of the main rope 24 of 200 m, if there is a mark defect of about 4 m on the first floor, the mark interval measurement process is performed using the position of the mark 45 that can be continuously detected other than the mark defect. Even if it continues, it is considered that there is no particular problem.

In order to control the strength of the main rope 24, safety can be obtained by setting the time when the elongation rate of the rope in FIG. 5 becomes λ as the replacement time. Therefore, it is desirable to obtain the allowable value Δp of the extension side mark interval by the following equation (4). Further, the permissible value Δp of the extension side mark interval may be obtained in advance as an Mmax number of data tables in the initial setting (step 401) together with the permissible value Δm of the contraction side mark interval.

M × Lb × λ… (4)
In addition, in general, before the replacement time is reached, it is necessary to allocate workers for replacement work and adjust the work schedule in consideration of the rope procurement period, etc., so taking these into consideration, a coefficient smaller than the elongation rate λ May be set as a coefficient α for observation required, and the rope elongation may be controlled by λ and α.

If the main rope 24 is not extended, the distance between the marks calculated by the arithmetic unit 30 is the same as the mark spacing (for example, 500 mm) attached to the main rope 24 at the time of installation. When the main rope 24 is stretched due to aged deterioration, the distance between the marks calculated by the arithmetic unit 30 becomes longer than the mark spacing (for example, 500 mm) at the time of installation.

Here, at the time of installing the elevator, the marks 45 are arranged at equal intervals in the longitudinal direction of the main rope 24. Therefore, when there is no elongation due to deterioration of the main rope 24, the count value of the pulse signal is substantially the same as the reference value corresponding to the mark interval at the time of installation. On the other hand, when the main rope 24 is stretched due to deterioration, the count value of the pulse signal exceeds the reference value corresponding to the mark interval at the time of installation (see FIG. 4).

If the data of the mark position to be determined remains after the mark interval determination process (No in step S410), the process from the mark interval calculation to the determination is repeated (step S402 to step S409). When the processing for all the data is completed (Yes in step S410), the control panel 40 checks the value of the mark interval small counter MC2 and the value of the mark interval large counter M4 (step S411). If the counters MC2 and M4 both remain at the initial values (Yes in step S411), the control panel 40 sets that the measurement result of the mark interval is normal (step S412), and then performs the mark interval calculation process. To finish.

On the other hand, if both the counters MC2 and MC4 are not initial values (No in step S411), the control panel 40 ends the mark interval calculation process after setting that there is an abnormality in the mark interval measurement result (step S413). do.

When the mark interval calculation process is completed, the arithmetic unit 30 calculates the elongation amount of the main rope 24 based on the distance of each mark interval stored as the measurement result in the memory 30a, and displays the result on the display device 31. At that time, when the mark defect occurs within the allowable range Ltemp, the measurement accuracy of the elongation amount can be improved by calculating the elongation amount based on the distance of each mark interval excluding the mark defect portion. .. The mark defect portion (L22 in the example of FIG. 8 and L23 in the example of FIG. 9) can be determined from the timing at which the mark defect counter MC3 is updated.

It is also possible to display only the mark interval on the display device 31 without calculating the elongation amount by the arithmetic unit 30. In this case, according to the measurement result of the mark interval, a normal alarm is issued in step S108 of FIG. 10, and an abnormal alarm is issued in step S109 of FIG. At the time of an abnormality notification, it may be possible to specifically inform which part of the mark interval the abnormality has occurred. The abnormal portion of the mark interval can be determined from the timing at which the mark interval small counter MC2 is updated and the timing at which the mark interval large counter MC4 is updated.

Further, for example, when the mark interval exceeds the reference value, for example, a warning message is displayed on the display device 31 or an alarm sound is emitted to notify the maintenance staff that the rope replacement time is approaching. May be. A warning message may be sent from the control panel 40 to the terminal device 52 owned by the maintenance staff. As a result, the inspection work by the maintenance staff can be reduced, and the time when the rope needs to be replaced can be grasped and dealt with.

Further, if the measurement result of the mark interval is periodically sent to the monitoring center 51 in a remote location, the monitoring center 51 can centrally manage the deterioration state of the main rope 24 of each property, and the rope replacement time can be set. You can inform the maintenance staff of nearby properties.

In the above embodiment, the reference value of the mark interval is Lb, and the mark defect compensation and the mark interval are calculated based on the two mark intervals. However, the mark interval is basically two or more predetermined marks. The moving average may be obtained and the mark defect compensation and the mark interval may be calculated. As a result, the measurement error can be suppressed and the measurement accuracy of the mark interval can be expected to be improved.

Further, in the above-described embodiment, the mark detection process (step S300) and the mark interval calculation process (step S400) are performed after the length measurement operation process (step S200), but the memory 30a for the predetermined elevating range is used. A series of processes may be divided into stored data blocks. As a result, the capacity of the memory 30a mounted on the arithmetic unit 30 can be suppressed.

Further, regarding the mark detection process, for example, the output voltage V of the sensor 28 and the threshold voltage Vs of the mark detection are compared using a comparison element, and the rising edge of the output of the comparison element is used as a trigger to calculate the integrated pulse number of the encoder 29. It may be stored in the memory 30a, and the ascending / descending position may be obtained as the mark position from the integrated number of pulses. As a result, it is no longer necessary to store the output voltage V of the sensor 28 and the integrated pulse from the encoder 29 at regular intervals, the load on the arithmetic unit 30 is reduced, high-speed processing becomes possible, and the capacity of the memory 30a is further suppressed. can.

As described above, according to the first embodiment, even if a mark defect occurs due to aged deterioration of the rope, the measurement of the mark interval can be continued within a predetermined allowable range, and a highly accurate measurement result can be obtained. Obtainable. Further, even if a plurality of sensors 28 are not arranged around the rope, it is possible to deal with the mark defect and suppress the cost increase.

(Second embodiment)
Next, the second embodiment will be described.
In the first embodiment, when the number of mark detections obtained by the mark detection process is out of the predetermined expected range, it is determined as an abnormality and the process is completed (see steps S308 and S309 in FIG. 12). .. On the other hand, in the second embodiment, when the number of mark detections is out of the predetermined expected range, the threshold voltage Vs is finely adjusted and the mark detection process is re-executed.

15 and 16 are diagrams for explaining the threshold voltage adjusting method in the second embodiment, FIG. 15 is a threshold voltage adjusting method when the number of mark detections is small, and FIG. 16 is a diagram when the number of mark detections is large. The threshold voltage adjustment method is shown.

When the number of mark detections is less than the expected range, as shown in FIG. 15, the threshold voltage Vs for mark detection is reduced by a predetermined voltage value to adjust to a new threshold voltage Vs1. When the number of mark detections is larger than the expected range, the mark detection threshold voltage Vs is increased by a predetermined voltage value to adjust to a new threshold voltage Vs1.

17 and 18 are flowcharts for explaining the mark detection process in the second embodiment. This mark detection process (step S500) is executed in place of step S300 in FIG. Since the main routine (FIG. 10), the length measurement operation process (FIG. 11), and the mark interval calculation process (FIG. 13) are the same as those in the first embodiment, the description thereof will be omitted here.

As an initial setting, the control panel 40 sets various conditions related to the mark detection process, such as the expected range of the number of mark detections for the ascending / descending range, the adjustment range of the threshold voltage Vs, and the threshold voltage change counter VC (step). S501). The mark detection process is executed through the arithmetic unit 30 under the control of the control panel 40.

Here, in the mark detection process in the second embodiment, the processes in steps S502 to S506 in FIG. 17 are the same as the processes in steps S302 to S306 in FIG. That is, the arithmetic unit 30 detects the position of the mark 45 attached to the main rope 24 by comparing the output voltage V of the sensor 28 stored in the memory 30a with the threshold voltage Vs, and the memory. Store in 30a (step S502). Further, the arithmetic unit 30 updates the number of mark detections every time the position of the mark 45 is detected (step S503). The arithmetic unit 30 repeats the calculation of the mark position and the update of the mark detection number described above until the data to be detected is completed (step S504).

After the data is completed, the control panel 40 acquires the mark detection number from the arithmetic unit 30 and determines whether or not the mark detection number is within the predetermined expected range (step S505). As a result, if the number of mark detections is within the expected range (Yes in step S505), the control panel 40 sets normal state information indicating that the number of mark detections is appropriate.

Here, in the second embodiment, when the number of mark detections is out of the expected range, the control panel 40 finely adjusts the mark detection threshold voltage Vs currently set in the arithmetic unit 30 (step S507). .. "Fine adjustment of the threshold voltage Vs" refers to an adjustment in which the threshold voltage Vs is gradually increased or decreased in a fixed voltage unit.

Specifically, when the number of mark detections is less than the expected range (when the number of detections is small), the control panel 40 reduces the threshold voltage Vs by a predetermined voltage value and adjusts to a new threshold voltage Vs1 (FIG. 15). reference). When the number of mark detections is larger than the expected range (when the number of detections is large), the control panel 40 increases the threshold voltage Vs by a predetermined voltage value and adjusts to a new threshold voltage Vs1 (see FIG. 16). ).

In this way, when the threshold voltage Vs is finely adjusted to the new threshold voltage Vs1, the control panel 40 determines whether or not the threshold voltage Vs1 is within the predetermined adjustment range (step S508). When the threshold voltage Vs1 is out of the adjustment range (No in step S508), the control panel 40 ends the mark detection process after setting an abnormality related to the threshold voltage adjustment process (step S509).

On the other hand, when the threshold voltage Vs1 is within the adjustment range (Yes in step S508), the control panel 40 updates the threshold voltage change counter VC after returning the mark detection number to the initial value (step S510). At the same time (step S511), a new threshold voltage Vs1 is set in the arithmetic unit 30 (step S512).

At this time, the control panel 40 determines whether or not the value of the threshold voltage change counter VC is within the predetermined limit range (step S513). If the value of the threshold voltage change counter VC is within the limit range (Yes in step S513), the control panel 40 causes the arithmetic unit 30 to execute the mark detection process using the new threshold voltage Vs1 (step S502). On the other hand, if the value of the threshold voltage change counter VC is out of the limit range (No in step S513), the control panel 40 ends the mark detection process after setting an abnormality in the number of mark detections (step S514).

As described above, according to the second embodiment, the threshold voltage Vs is finely adjusted when the mark detection number is out of the predetermined mark detection number range during the mark detection process. As a result, the detection accuracy due to the individual difference of the sensor 28 can be adjusted, and the mark detection process can be re-executed using the integrated pulse number and the output voltage V already stored in the memory 30a without restarting the car 20. ..

(Third embodiment)
Next, a third embodiment will be described.
In the third embodiment, the threshold voltage Vs is roughly adjusted before the fine adjustment of the threshold voltage Vs described in the second embodiment. "Approximate adjustment of the threshold voltage Vs" means adjusting the threshold voltage Vs to a predetermined value rather than finely adjusting it step by step.

19 and 20 are flowcharts for explaining the mark detection process in the third embodiment. This mark detection process (step S500) is executed in place of step S300 in FIG. Since the main routine (FIG. 10), the length measurement operation process (FIG. 11), and the mark interval calculation process (FIG. 13) are the same as those in the first embodiment, the description thereof will be omitted here. Further, regarding the processing that overlaps with the second embodiment, the same step number will be assigned and the description thereof will be omitted.

As an initial setting, the control panel 40 sets various conditions related to the mark detection process, such as the expected range of the number of mark detections for the ascending / descending range, the adjustment range of the threshold voltage Vs, and the threshold voltage change counter VC (step). S501).

Here, in the mark detection process in the third embodiment, first, the threshold voltage adjustment process is executed as shown in FIG. 20 (step S600).
That is, the control panel 40 calculates the average value Va of the output voltage V stored in the memory 30a at regular intervals (step S601). The control panel 40 determines whether or not the average value Va of the output voltage V is within a predetermined allowable range of voltage change (step S602). If the average value Va of the output voltage V is within the allowable range of voltage change (Yes in step S602), the control panel 40 sets that the threshold voltage (threshold voltage Vs at the time of initial setting) is normal (Yes). Step S606), the threshold voltage adjustment process is terminated.

On the other hand, if the average value Va of the output voltage V is out of the allowable range of voltage change (No in step S602), the control panel 40 roughly adjusts the threshold voltage Vs as follows (step S603).

-Approximate adjustment of threshold voltage Vs The average value Va of the output voltage V includes a voltage corresponding to the length of the mark 45 on the main rope 24. Ideally, the average value Va of the output voltage V should be calculated in the range excluding the voltage corresponding to the length of the mark 45. However, the length of the marked mark 45 is very small with respect to the mark interval, and even when the ratio of the output voltage V of the sensor 28 to the mark 45 shown in FIG. 3 and the outer peripheral surface 44a is taken into consideration, the mark 45 is marked. The voltage for the length can be ignored.

Here, when the peak voltage (voltage corresponding to the portion of the mark 45) included in the output voltage V shown in FIG. 15 is Vp, the average value Vpa of the peak voltage Vp, and the adjustment coefficient of the threshold voltage is k, it is new. The threshold voltage Vs1 can be obtained by the following equation (5).

Vs1 = Va + k × (Vpa-Va) / 2 ... (5)
If it is difficult to calculate the peak voltage Vp, as shown in the equation (6), the average value Vpa of the output voltage V may be multiplied by the adjustment coefficient k to obtain a new threshold voltage Vs1.

Vs1 = k × Vpa… (6)
Further, here, the threshold voltage Vs1 is calculated using the average value Vpa of the peak voltage Vp or the average value Va of the output voltage V, but in consideration of the dispersion values of the peak voltage Vp and the output voltage V, for example, the peak voltage Vp. The threshold voltage Vs1 may be calculated using the median value of or the median value of the output voltage V.

When a new threshold voltage Vs1 is obtained by such rough adjustment, the control panel 40 determines whether or not the threshold voltage Vs1 is within a predetermined threshold voltage change range (step S604). If the threshold voltage Vs1 is within the voltage change range (Yes in step S604), the control panel 40 updates the threshold voltage Vs to the threshold voltage Vs1 (step S605), and the threshold voltage (updated threshold voltage Vs1) is normal. (Step S606), the threshold voltage adjustment process is terminated.

On the other hand, if the threshold voltage Vs1 is out of the voltage change range (No in step S604), the control panel 40 sets that the threshold voltage (updated threshold voltage Vs1) is abnormal (step S607), and sets the threshold. The voltage adjustment process is finished.

Returning to FIG. 19, if the threshold voltage is normally set (No in step S601), the processes of steps S502 to S507 are executed. Since the processes of steps S502 to S507 have already been described in the second embodiment, they will be omitted here.

As described above, according to the third embodiment, the number of mark detections for the ascending / descending range is performed by adjusting the threshold voltage Vs required for marker detection in advance by using the average value or the median value of the output voltage V. It is possible to suppress the number of fine adjustments of the threshold voltage when the overshoot or undershoot occurs.

According to at least one embodiment described above, even if a mark defect occurs, it is possible to continue the measurement of the mark interval, determine the rope elongation from the measurement result, and perform highly reliable strength management. An elevator rope inspection system can be provided.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

10 ... hoistway, 11, 12 ... guide rail, 20 ... car, 21 ... counter weight, 22 ... traction sheave, 23 ... hoist, 24 ... main rope, 25a, 25b ... rope hitch, 26 ... car sheave, 27 ... counter weight sheave, 28 ... sensor, 29 ... encoder, 30 ... arithmetic device, 30a ... memory, 31 ... display device, 32 ... landing detection member, 33 ... non-contact switch, 40 ... control panel, 50 ... communication network, 51 ... Monitoring center, 52 ... Terminal equipment.

Claims (10)

A rope having a structure in which a car and a counterweight are suspended via a traction sheave of a hoist and the surface of which is coated with resin is provided, and the spacing between a plurality of marks provided at regular intervals on the surface of the rope. In the elevator rope inspection system to measure
A sensor provided near the rope and
A mark detecting means for detecting the position of each mark based on the signal output from the sensor and the data indicating the ascending / descending position of the car with the movement of the rope.
A mark interval calculation means that calculates a mark interval based on the position of each mark detected by the mark detection means, and a mark interval calculation means.
The measurement result is valid when it has a reference value of the mark spacing for the rope and the mark spacing obtained as a measurement result by the mark spacing calculation means is within the allowable range defined by an integral multiple of the reference value. , A rope inspection system for elevators, characterized by being equipped with a control means for determining rope elongation from the measurement results. The lower limit value of the permissible range is a value obtained by subtracting the first permissible value from the reference value and multiplying the value by an integer.
The rope inspection system for an elevator according to claim 1, wherein the upper limit value of the allowable range is a value obtained by adding a second allowable value to the reference value and multiplying the value by an integer. The lowest value of the integer multiple is 1.
The elevator according to claim 1, wherein the maximum value of the integral multiple is determined so that the mark interval at the time of mark loss is within the range of the first floor from the relationship between the moving distance of the rope and the floor interval. Rope inspection system. The control means is
The rope inspection system for an elevator according to claim 1, wherein an abnormal alarm is issued when the mark interval is out of the permissible range. A counting means for counting the number of each mark detected by the mark detecting means is provided.
The control means is
It has an expected number of mark detections obtained from the relationship between the moving distance of the rope and the reference value, and the number of each mark obtained by the counting means is within the expected range in which the expected number has a likelihood. The rope inspection system for an elevator according to claim 1, wherein the mark interval calculation process is executed by the mark interval calculation means. The control means is
The rope inspection system for an elevator according to claim 5, wherein an abnormality is reported when the number of each mark is out of the expected range. The control means is
The rope inspection system for an elevator according to claim 6, wherein when the number of each mark is out of the expected range, the threshold value for the signal level of the sensor is finely adjusted within a predetermined allowable range. The control means is
The rope inspection system for an elevator according to claim 7, wherein the threshold value is roughly adjusted based on the average value or the median value of the signal levels of the sensor before the threshold value is finely adjusted. The control means is
The rope inspection system for an elevator according to claim 7, wherein the threshold value is roughly adjusted based on the average value or the median value of the peak values included in the signal level of the sensor before the threshold value is finely adjusted. The rope inspection system for an elevator according to claim 1, further comprising a storage means for storing at least a signal output from the sensor and data indicating an elevating position of the car at regular intervals.

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