JP7230727B2 - Elevator rope inspection device and elevator rope inspection method - Google Patents

Description

The present invention relates to technology for inspecting elevator ropes.

Wire rope inspection apparatuses disclosed in Patent Documents 1 and 2, for example, have been proposed as methods of inspecting elevator ropes. These inspection devices perform inspection based on the measured value of the diameter of the wire rope detected from the photographed image of the wire rope of the elevator.

Japanese Patent No. 5769875 Japanese Unexamined Patent Application Publication No. 2011-132010 JP 2018-87063 A

A conventional elevator rope inspection device performs inspection based on the measured value of the diameter of the elevator rope.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to compensate for the inspection accuracy of an elevator rope without depending on the error in the measured position of the elevator rope.

Accordingly, one aspect of the present invention is an elevator rope inspection device, wherein when there is an error between the current and past measured positions of the elevator rope, the total amount of difference between the current and past diameter values is minimized. and a measurement position correction unit that shifts the display of the past measurement position to the display of the current measurement position so that the A data comparator is provided to detect an abnormal location in the elevator rope.

One aspect of the present invention is an elevator rope inspection device, in which when the number of current measurement positions of an elevator rope is different from the number of past measurement positions of the elevator rope, the difference between the current and past diameter values is determined. A measurement position correction unit that shifts the display of the current measurement position to the display of the past measurement position by expansion and contraction matching that minimizes the total amount, and the current data of the diameter value whose display is corrected by the shift as the past data. A data comparison unit is provided for detecting an abnormal portion of the elevator rope by comparison.

According to one aspect of the present invention, in the elevator rope inspection device, the data comparison unit detects the section of the current measurement position stretched or contracted by the stretch matching as a slip point of the elevator rope.

According to one aspect of the present invention, in the elevator rope inspection device, the abnormal location is a location where wear progresses.

One aspect of the present invention is an elevator rope inspection method executed by an elevator rope inspection device, wherein when there is an error between the current and past measured positions of the elevator rope, the difference between the current and past diameter values is detected. a step of shifting the display of the past measurement position to the display of the current measurement position so that the total amount of detecting an abnormal portion of the elevator rope by:

One aspect of the present invention is an elevator rope inspection method executed by an elevator rope inspection device, wherein when the number of current measured positions of an elevator rope is different from the number of past measured positions of the elevator rope, a step of shifting the display of the current measurement position to the display of the past measurement position by expansion and contraction matching that minimizes the total amount of differences in past diameter values; with past data to detect an abnormal location of the elevator rope.

According to the present invention as described above, it is possible to compensate for the inspection accuracy of the elevator rope without depending on the error of the measured position of the elevator rope.

1 is a schematic configuration diagram of an elevator rope inspection device that is one aspect of the present invention; FIG. An example of a binary image of an elevator rope. An example of the graph which showed the relationship between the measurement position of an elevator rope, and a diameter value. An example of the graph which compared and displayed the present data Dc and the past data Dp of the said diameter value. An example of a graph in which the difference between the current data Dc and the past data Dp of the diameter value is shown by cross hatching. An example of a graph showing a shift amount (correction amount of position display) of the past data Dp of the diameter value by cross hatching. 4 is a flowchart for explaining an operation example 1 of the elevator rope inspection device; An example of a graph showing the relationship between the number of measured data and the diameter value of the elevator rope when the slip of the elevator rope occurs and when it does not occur. An example of a graph obtained by expansion/contraction matching processing of the graph of FIG. 4 is a flowchart for explaining an operation example 2 of the elevator rope inspection device; An example of the graph which showed the relationship between the measured position of an elevator rope before correction|amendment of a measured position display, and a diameter value. An example of the graph which showed the relationship between the measured position of an elevator rope after correction|amendment of a measured position display, and a diameter value. 4 is a flow chart explaining an operation example 3 of the elevator rope inspection device;

Embodiments of the present invention will be described below with reference to the drawings.

The elevator rope inspection device 1 of this embodiment shown in FIG. By performing the position correction of , compensation for inspection accuracy is attempted.

(Example of embodiment of elevator rope inspection device 1)
The elevator rope inspection device 1 includes line sensor cameras 2 a and 2 b, lighting devices 3 a and 3 b, an analysis section 4 , a storage device 5 , a measurement position correction section 6 and a data comparison section 7 .

The line sensor cameras 2a and 2b are one aspect of the imaging device provided for the present invention. In particular, the line sensor camera 2a is synchronized with the line sensor camera 2b by the synchronizing signal S1, and photographs, for example, the photographing range R1 from the front of the elevator rope 10. As shown in FIG. On the other hand, the line sensor camera 2b is synchronized with the line sensor camera 2a by the synchronizing signal S1 and shoots, for example, a shooting range R2 from the back of the elevator rope 10. FIG.

The line sensor cameras 2a and 2b have scanning directions perpendicular to the running direction of the elevator rope 10, and the photographing lines are at the same position with respect to the running direction of the elevator rope 10, and the whole circumference of the elevator rope 10 is photographed. do. Furthermore, the line sensor cameras 2a and 2b take pictures while automatically changing the sampling frequency according to the position signal S3 based on the running speed of the elevator rope 10 supplied from the elevator controller 8 (Patent Document 3).

The illumination device 3a is arranged near the line sensor camera 2a and illuminates the photographing range R1 of the elevator rope 10. As shown in FIG. On the other hand, the illumination device 3b is arranged near the line sensor camera 2b and illuminates the photographing range R2 of the elevator rope 10. FIG.

The line sensor cameras 2a and 2b and the lighting devices 3a and 3b described above are arranged around the elevator rope 10 hoist.

The analysis unit 4 includes an image recording unit 41 and an image processing unit 42 through cooperation of computer hardware resources and software resources.

The image recording unit 41 creates an image 11 illustrated in FIG. 2, which is a binary image of the elevator rope 10, based on the image signal S2 provided from the line sensor cameras 2a and 2b. In addition, the data of the image 11 are sequentially stored in the storage device 5 in association with the measured position based on the position signal S3 of the elevator rope 10 from the controller 8 .

The image processing unit 42 calculates the diameter value of the elevator rope 10 corresponding to the position signal S3 based on the image 11, which is a binary image based on the image signal S2. This diameter value is calculated by a well-known diameter calculation method such as Patent Document 2, and is sequentially stored in the storage device 5 in chronological order in association with the measurement position based on the position signal S3. The diameter value is stored in the storage device 5 in the form of a graph showing the relationship with the measurement position, for example, as shown in FIG.

If there is an error between the past and present measured positions of the elevator rope 10, the measured position correction unit 6 corrects the past measured positions so that the total amount of difference between the past and present diameter values is minimized. The display is shifted to display the current measurement position.

The data comparison unit 7 detects an abnormal portion of the elevator rope 10 by comparing the current data Dc of the diameter value of the elevator rope 10 whose display is corrected by the shift with the past data Dp.

(Operation example 1)
An example of the operation of the elevator rope inspection device 1 when the number of data on the diameter value of the elevator rope 10 is the same but the measurement positions are shifted will be described.

Said diameter value data was calculated from a binary image of the elevator rope 10 illustrated in FIG. The form of the graph showing the relationship between the measured position of the elevator rope 10 and the diameter value forms unevenness according to the surface shape of the elevator rope 10, as shown in FIG.

Since the measured position of the elevator rope 10 obtained from the controller 8 has an error every time it is measured, the graphs of the current data Dc and the past data Dp of the diameter value deviate as shown in FIG. 4, for example.

Therefore, the measurement position correction unit 6 pays attention to the difference in the amount of wear between the past data Dp and the current data Dc. corrects the display of

The cross-hatched area in FIG. 5 indicates the difference in the amount of wear at the same measurement position including the error. When correcting the display, the difference in the amount of wear is evaluated. Specifically, the difference between the measured position of the past data Dp and the current data Dc is sequentially calculated by comparison while shifting the measured position of the past data Dp in the direction of the thick arrow in FIG. At this time, the amount of shift of the past data Dp that minimizes the total amount of difference as shown in FIG. 6 is the amount of position correction. The data comparison unit 7 compares the amount of wear between the past data Dp and the current data Dc to calculate the amount of wear for each measurement position and the average value of wear for the entire rope, and detects locations where wear has progressed significantly from the previous measurement value. .

The execution steps of the operation example 1 will be described below with reference to the flowchart of FIG.

S101: The line sensor cameras 2a and 2b photograph the elevator rope 10. The image recording unit 41 creates an image 11 of the elevator rope 10 by binarizing the image signal S2 obtained by the photographing, stores the image 11 in the storage device 5 in association with the position signal S3 from the controller 8 .

S102: The image processing unit 42 calculates the diameter value of the elevator rope 10 corresponding to the position signal S3 based on the image 11 of the elevator rope 10 extracted from the storage device 5, and compares the measured position based on the position signal S3 with the diameter value. Create a graph showing the relationship between This graph is saved in the storage device 5 .

S103: When there is an error in the measured position between the current data Dc and the past data Dp of the diameter value of the elevator rope 10 retrieved from the storage device 5, the measured position correction unit 6 corrects the display of the measured position of the past data Dp. Perform the following shifts. That is, the display of the measurement position of the past data Dp is shifted to the display of the measurement position of the current data Dc so that the total amount of difference in diameter value between the current data Dc and the past data Dp is minimized (FIGS. 5 and 6). The graph in which the past data Dp are displayed in shift is stored in the measurement data database DB of the storage device 5 in the manner shown in FIG. 6, for example.

S104: The data comparison unit 7 compares the current data Dc and the past data Dp of the diameter value of the elevator rope 10 based on the graph of FIG.

S105: If it is determined that the elevator rope 10 has an abnormal portion as a result of the comparison, the process proceeds to S106, and otherwise, the process of the first operation example ends.

S106: When it is determined that there is an abnormal location, the image processing unit 42 creates an image of the inspection result displaying the location where the wear of the elevator rope 10 progresses (for example, the location where wear has progressed significantly from the previous measurement value). and output. After that, the processing of operation example 1 ends. The image obtained in this step is output and displayed as appropriate on the monitor section of the elevator rope inspection device 1 or on the terminal of the user (for example, an inspector).

In the prior art, it was difficult to compare the current data and the past data of the diameter value of the elevator rope when an error occurred in the position signal of the elevator rope.

On the other hand, according to the operation example 1, when comparing the current data and the past data of the diameter value of the elevator rope 10, the measurement position of the past data Dp is adjusted so that the total amount of difference from the current data Dc is minimized. The display is shifted to display the measurement position of the current data Dc (FIGS. 5 and 6).

Therefore, according to the elevator rope inspection method of Operation Example 1 described above, even if an error occurs in the external signal used for inspection, it is possible to appropriately compare the current data and the past data of the elevator rope 10 . can compensate for the inspection accuracy of

(Operation example 2)
An operation example of the elevator rope inspection device 1 when the number of current data and past data on the diameter value of the elevator rope 10 is different will be described.

The elevator rope inspection device 1 changes the frame rate of the line sensor cameras 2a and 2b in accordance with the elevator position signal S3 from the controller 8, thereby constantly photographing the elevator rope 10 at regular pitch intervals. Here, if the elevator rope 10 slips between the elevator rope 10 and the sheave and an error occurs in the measurement position, the frame rate of the line sensor cameras 2a and 2b is affected accordingly. When a difference occurs in the frame rate due to the slip, an error occurs in the number of photographed images of the elevator rope 10 and the amount of measurement data of rope diameter values subjected to image analysis.

When a positional error due to slip occurs even in the same object to be measured, for example, as shown in FIG. There is a difference d between the data amount of . In other words, the amount of data for the diameter value A is greater than the amount of data for the diameter value N.

When comparing the diameter values of the elevator rope 10 when slip occurs and when it does not occur and grasps aging deterioration, it is necessary to correct the number of data of the diameter value and compare for the same measurement position. .

Therefore, the measurement position correction unit 6 applies well-known expansion/contraction matching exemplified by dynamic programming to correct the number of data. This expansion/contraction matching can correct the display of the measurement position for data with different numbers of data.

Specifically, focusing on the uneven shape of the rope, the diameter value data when a slip occurs is expanded and contracted, and the difference between the diameter value when a slip does not occur is sequentially calculated. The expansion/contraction amount of the current data that minimizes the total amount of this difference is set as the position correction amount. After the display of the measurement position is corrected, the data comparison unit 7 compares the past data of the wear amount with the current data to calculate the wear amount for each measurement position and the average wear value of the entire rope. Detects areas where wear has progressed significantly.

The execution steps of Operation Example 2 will be described below with reference to the flowchart of FIG.

S201: The line sensor cameras 2a and 2b photograph the elevator rope 10. The image recording unit 41 creates an image 11 of the elevator rope 10 by the same processing as S101, associates it with the position signal S3 from the controller 8, and stores it in the storage device 5. FIG.

S202: The image processing unit 42 performs the same processing as in S102 on the image 11 of the elevator rope 10 retrieved from the storage device 5, and creates a graph showing the relationship between the measured position of the elevator rope 10 and the diameter value. This graph is saved in the storage device 5 .

S203: When the number of measurement positions differs between the current data and the past data of the diameter value of the elevator rope 10 retrieved from the storage device 5, the measurement position correction unit 6 shifts the display of the measurement position of the current data as follows. to run. That is, the display of the measurement position of the current data (for example, the diameter value A in FIG. 8) is changed to the past data (for example, the diameter value N in FIG. data) is shifted to the display of the measurement position (Figs. 8 and 9). The graph in which the current data is displayed in shift is stored in the measurement data database DB of the storage device 5 in the manner shown in FIG. 9, for example.

S204: The data comparison unit 7 compares the current data (e.g. diameter value A data) and past data (e.g. diameter value N data) of the elevator rope 10 based on the graph of FIG. I do.

S205: If it is determined from the above comparison that the elevator rope 10 has an abnormal portion such as a portion where wear progresses, the process proceeds to S206, and otherwise, the processing of Operation Example 2 ends.

S206: When it is determined that there is an abnormal location, the image processing unit 42 creates an image of the inspection result displaying the abnormal location (for example, a location where wear has progressed significantly from the previous measurement value) of the elevator rope 10. output. After that, the processing of the operation example 2 ends. The image obtained in this step is output and displayed as appropriate on the monitor section of the elevator rope inspection device 1 or on the terminal of the user (for example, an inspector).

In the prior art, when a slip between the elevator rope 19 and the sheave causes a difference in the data amount of the position signal S3 and the diameter value of the elevator rope 10, it is difficult to compare the current data and the past data of the diameter value. rice field. On the other hand, according to the operation example 2, the display of the measurement position of the current data is corrected to be shifted to the measurement position of the past data by expansion/contraction matching.

Therefore, according to the elevator rope inspection method of the operation example 2, even if the number of the current data and the number of the past data of the diameter value of the elevator rope are different, it is possible to appropriately compare the current data and the past data. can compensate for the inspection accuracy of

(Operation example 3)
As is clear from the description of the operation example 2, the location where the display of the current data of the diameter value of the elevator rope 10 is corrected by the expansion/contraction matching becomes the slip location of the elevator rope 10 .

Therefore, the data comparison unit 7 detects the section of the measured position of the elevator rope 10 stretched or stretched by the stretching matching as a slip point of the elevator rope 10 .

For example, in a case where the graph of FIG. 11 is shifted to the graph of FIG. 12, the measurement positions of the section CR shown in FIG. 11 are subject to shift display by the expansion/contraction matching. Then, the section S shown in the graph of FIG. 12 obtained by the contraction matching is detected as a slip point.

The execution steps of the operation example 3 will be described below with reference to the flowchart of FIG.

S301: The line sensor cameras 2a and 2b photograph the elevator rope 10. The image recording unit 41 creates an image 11 of the elevator rope 10 by the same processing as in S201, associates it with the position signal S3 from the controller 8, and stores it in the storage device 5. FIG.

S302: The image processing unit 42 performs the same processing as in S202 on the image 11 of the elevator rope 10 retrieved from the storage device 5, and creates a graph showing the relationship between the measured position of the elevator rope 10 and the diameter value. This graph is saved in the storage device 5 .

S303: The measurement position correction unit 6 performs the same processing as in S203 when the number of measurement positions differs between the current data and the past data of the diameter value of the elevator rope 10 retrieved from the storage device 5 (Figs. 12). The graph in which the current data is displayed in a shift manner in this step is stored in the measurement data database DB of the storage device 5 in the manner shown in FIG. 12, for example.

S304: The measurement position correction unit 6 identifies the section S detected in the graph of FIG. After that, the process proceeds to S206. On the other hand, if the section S is not detected in the graph, the process of the operation example 3 ends.

S305: The image processing unit 42 creates and outputs an inspection result image that displays the slip location (section S) of the elevator rope 10 detected in S304. After that, the processing of the operation example 3 ends. The image obtained in this step is output and displayed as appropriate on the monitor section of the elevator rope inspection device 1 or on the terminal of the user (for example, an inspector).

Conventionally, it was impossible to measure the slip between the elevator rope 10 and the sheave. On the other hand, according to the elevator rope inspection method of the operation example 3, the slip in the elevator rope 10 is determined by expansion matching considering the number of diameter value data when the elevator rope 10 is slipped and when it is not slipped. The location of occurrence can be easily detected.

1... Elevator rope inspection device 2a, 2b... Line sensor camera (photographing device)
3a, 3b Illumination device 4 Analysis unit 41 Image recording unit 42 Image processing unit 5 Storage device 6 Measurement position correction unit 7 Data comparison unit 8 Controller 10 Elevator rope R11, R12 Photographing Range 11... Image CR, S... Section S1... Synchronization signal, S2... Image signal, S3... Position signal L1... Replacement recommended line, L2... Replacement line Dp... Past data, Dc... Current data

Claims (3)

When the number of current measurement positions of the elevator rope is different from the number of past measurement positions of the elevator rope, display of the current measurement position by expansion matching that minimizes the total amount of difference between the current and past diameter values. a measurement position correction unit that shifts the display to the display of the past measurement position;
a data comparison unit that detects an abnormal location of the elevator rope by comparing current data of the diameter value whose display is corrected by the shift with past data ;
The elevator rope inspection device, wherein the data comparison unit detects the section of the current measurement position that has been expanded or contracted by the expansion or contraction matching as a slip point of the elevator rope. 2. The elevator rope inspection device according to claim 1 , wherein the abnormal location is a location where wear progresses. An elevator rope inspection method executed by an elevator rope inspection device, comprising:
When the number of current measurement positions of the elevator rope is different from the number of past measurement positions of the elevator rope, display of the current measurement position by expansion matching that minimizes the total amount of difference between the current and past diameter values. to the display of the past measurement position;
and detecting an abnormal location of the elevator rope by comparing current data of the diameter value, the display of which is corrected by the shift, with past data ;
The elevator rope inspection method, wherein the step of detecting the abnormal point detects the section of the current measurement position stretched or contracted by the stretch matching as a slip point of the elevator rope.

Images