JP2011128125A - Device and method for inspecting elongation of wire rope - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and method which can be applied to an elongation inspection of an existing wire rope, and correctly measure elongation following decay caused by secular use with a simple construction. <P>SOLUTION: A device 1 for inspecting elongation of a wire rope is equipped with a magnetizing means 10 and a magnetism detecting means 20, and forms a magnetized part every predetermined distance by the magnetizing means 10 before elongation inspection. Accordingly, the elongation of the wire rope 130 used for an existing elevator, in which a predetermined marking is not applied in advance, can be inspected. Furthermore, the elongation of the wire rope 130 can be measured very correctly in such a manner that the magnetism detecting means 20 can be moved in a longitudinal direction of the wire rope 130 by being supported by a supporting rail 30 for the magnetism detecting means, and that it is constructed by measuring a distance between the magnetizing members in such a condition that the wire rope 130 is turned in standstill. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a technique for inspecting elongation due to deterioration over time associated with the use of a wire rope, and in particular, elongation inspection for inspecting the elongation of a wire rope used for hanging heavy objects or the like that require a predetermined load bearing performance. The present invention relates to an apparatus and an elongation inspection method.

  For wire ropes that are used in rope type elevators and vertical loopers installed in steel plate production lines and that require the specified load-bearing performance, cutting them during use will lead to a serious accident. It is necessary to accurately grasp the deterioration state so as not to miss. If wire breakage occurs in the wire rope and the cut portion protrudes outward, such deterioration can be confirmed relatively easily during inspection, but the wire breakage occurring near the center of the wire rope. Is not easily confirmed. Further, for safer operation, it is desired to grasp the deterioration of the wire rope before such wire breakage occurs. In view of this, Patent Documents 1 to 3 disclose a technique for quickly grasping the deterioration of the wire rope by measuring the elongation of the wire rope over time.

  Patent Document 1 is a technique for observing the elongation by counting the number of pitches of the crest and trough on the outer surface of the wire rope within a predetermined distance and measuring the change in the number of pitches over time. Patent Document 2 is a technique for observing the elongation of a belt by marking the outer surface of an elevator lifting belt at equal intervals using a laser or the like, and measuring the change over time in the distance between the markings. Patent Document 3 is a technique for observing the elongation of a rope by installing magnetically permeable targets at equal intervals inside an elevator hoisting rope and measuring the change over time of the distance between the targets.

Japanese Patent Laid-Open No. 10-318741 JP 2005-512921 gazette Japanese Patent Laid-Open No. 10-182036

  However, the invention of Patent Document 1 counts the number of pitches between the peaks and valleys on the outer surface of the wire rope using an image sensor, and is basically a wire rope that can clearly observe these peaks and valleys. Without it it is difficult to apply. In addition, when the outer shape of the wire rope is deformed by being crushed or worn, there is a problem that it is difficult to accurately measure the number of pitches of the peak and valley. Moreover, since it captures the number of pitches of the peaks and valleys, the calculated elongation remains a concern in terms of accuracy.

  In the invention of Patent Document 2, when the outer surface of the belt is worn or soiled due to long-term use of the belt and the marking disappears or becomes unclear, it becomes difficult to measure the distance between the markings.

  The invention of Patent Document 3 uses a special rope in which a magnetically permeable target is previously installed inside the rope, and is not a technique that can be applied to the measurement of the elongation of an existing wire rope. This is a technique that makes it possible to measure elongation only when a special rope disclosed in Patent Document 3 is used in advance, and has a narrow application range and high cost.

  The present invention has been made in view of the above, and can be applied to the inspection of the elongation of an existing wire rope that has not been marked on the wire rope in advance, and with a simple configuration, the elongation due to deterioration of the wire rope over time. It is an object of the present invention to provide a wire rope elongation inspection device and an elongation inspection method that can be accurately measured.

In order to solve the above-described problem, the wire rope elongation inspection apparatus according to the present invention includes a magnetizing unit that applies magnetism to the wire rope to form a plurality of magnetized portions, and the magnetizing unit that applies the magnetizing unit. Magnetic detection means for detecting each of the magnetized portions of the wire rope, support rails for the magnetic detection means for supporting the magnetic detection means movably along the longitudinal direction of the wire rope, and the magnetic detection means When the magnetized portions are detected by moving along the support rails for the magnetic detecting means, the position measuring means for the magnetic detecting means for measuring the position of the magnetic detecting means for each detection of the magnetized portions, and the wire Temperature measuring means for measuring the temperature of the rope, and each magnetized portion calculated based on position data of the magnetic detecting means sequentially measured by the position measuring means for the magnetic detecting means at the time of inspection Is measured based on the temperature of the wire rope measured by the temperature measuring means, and the corrected distance data is the reference distance data that is the distance between the magnetized parts when the magnetized parts are formed. And an arithmetic control means for calculating the elongation of the wire rope.
The magnetizing means may be configured to apply magnetism to the wire rope every predetermined time.
The magnetic detection means can be fixed on the magnetic detection means support rail at a position away from the magnetization means by a predetermined distance, and the magnetization means is magnetized immediately before being formed on the wire rope. When a part is detected by the magnetic detection means fixed at a predetermined position on the support rail for the magnetic detection means, a magnet is applied to the wire rope to form a next magnetized part. can do.
Further, a magnetizing means support rail for supporting the magnetizing means movably along the longitudinal direction of the wire rope, and a magnetizing means for measuring the position of the magnetizing means supported by the magnetizing means support rail. Magnetic position measurement means is provided, and magnetism is applied to the wire rope each time the position data of the magnetization means measured by the position measurement means for the magnetization means becomes a value indicating a predetermined position. It can be set as the structure to do.
It is preferable to further comprise a demagnetizing means for erasing the magnetism of the wire rope before the magnetization by the magnetizing means.
The arithmetic control means includes a reference distance data storage unit that stores the distance between each magnetized site when forming the magnetized site as the reference distance data, and an actual measurement between each magnetized site of the wire rope at the time of inspection. Temperature correction means for correcting the distance data using the temperature of the wire rope at the time of inspection to obtain correction distance data, and reading the reference distance data between each magnetized part from the reference distance data storage unit, and the reference It is preferable that the apparatus further comprises elongation calculation means for comparing the distance data with the correction distance data obtained by the temperature correction means to calculate the elongation of the wire rope.
The calculation control means determines whether the elongation of the wire rope is equal to or greater than a predetermined value by the elongation calculation means, and determines that the elongation of the wire rope is equal to or greater than a predetermined value by the determination means. It is preferable to further include warning control means for activating any warning means in the event of a failure.

The wire rope inspection method of the present invention is a wire rope elongation inspection method for inspecting wire rope elongation, and a plurality of magnetized portions are formed in advance by applying magnetism to the wire rope. The magnetism detecting means sequentially detects the plurality of magnetized portions of the wire rope, and measures the position of the magnetism detecting means each time it is detected. Based on the position data of the magnetism detecting means, the wire rope The measured distance data between the magnetized parts of the wire rope and the temperature of the wire rope at the time of inspection are measured, and the measured distance data between the magnetized parts of the wire rope is obtained at the time of inspection. The wire rope is corrected based on the temperature of the rope, and the correction distance data is compared with reference distance data which is a distance between each magnetized part at the time of forming the magnetized part. And calculating the elongation.
In the step of forming the magnetized part on the wire rope, the magnetizing means for forming the magnetized part can be operated at predetermined time intervals while the wire rope is running.
In the step of forming the magnetized part on the wire rope, the magnetizing means for forming the magnetized part and the magnetic detecting means are fixedly arranged in advance at a predetermined distance, and the magnetized part formed on the wire rope is When detected, the magnetizing means can magnetize by repeatedly applying magnetism to the wire rope to form the next magnetized portion.
In the step of forming the magnetized portion on the wire rope, the wire rope can be stationary and magnetized at a predetermined position while moving the magnetizing means for forming the magnetized portion.

  According to the present invention, the wire rope elongation inspection device includes a magnetizing means and a magnetic detection means, and before the elongation is inspected, a magnetized portion is formed at a predetermined distance by the magnetizing means. It is the structure which detects a site | part and test | inspects elongation. Therefore, it is possible to inspect the elongation of a wire rope used in an existing elevator or the like that has not been subjected to predetermined marking in advance. In particular, since the present invention is configured to measure the distance between the magnetized parts by measuring the position of the magnetic detection means, even if the wire rope is swaying or running is unstable, The distance between magnetized parts can be measured accurately. In addition, since the temperature measurement means of the wire rope is provided and the measured distance data between the magnetized parts measured by the position measuring means for the magnetic detection means can be temperature-corrected, it is possible to obtain the elongation due to deterioration due to use over time with high accuracy. it can.

FIG. 1 is a diagram showing a schematic configuration of a wire rope stretch inspection apparatus according to a first embodiment of the present invention. FIG. 2 is a diagram schematically showing the configuration of the arithmetic control means of the above embodiment. Drawing 3 is a figure for explaining the process of inspecting the elongation of a wire rope using the elongation inspection device of the wire rope in the embodiment concerning the present invention. FIG. 4 is a diagram showing a schematic configuration of a wire rope stretch inspection apparatus according to the second embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a wire rope elongation test apparatus 1 according to a first embodiment of the present invention, in which an elongation of a wire rope 130 supporting an elevator car 110 and a weight 120 in a rope type elevator system 100 is shown. The case where it applies to a test | inspection is shown.

  As shown in FIG. 1, the wire rope elongation inspection apparatus 1 according to this embodiment includes a magnetizing means 10, a magnetic detecting means 20, a magnetic detecting means support rail 30, a magnetic detecting means position measuring means 40, a demagnetizing means. Means 50, temperature measuring means 60, calculation control means 70 and the like are configured.

  The magnetizing means 10 is composed of a magnetizer equipped with a magnetizing head 11 and magnetizes a predetermined portion of the wire rope 130 by applying magnetism. The magnetizing means 10 is set so that, for example, the wire rope 130 travels at a constant speed in the longitudinal direction and is driven to apply magnetism every time a predetermined time (for example, 1 second) elapses. The Since the wire rope 130 is traveling at a constant speed, a magnetized portion can be formed on the wire rope 130 at predetermined intervals by being driven every predetermined time.

  The magnetizing means 10 is attached to a wall surface 140 of a hoistway that is an attachment portion, and can be detached from the wall surface 140. After the magnetized portion is formed on the wire rope 130, the magnetizing means 10 is not used until the timing at which the magnetic force is weakened due to demagnetization and must be re-magnetized. Therefore, it is preferable to be removable from the attachment portion. After the magnetization, the magnetizing means 10 can be removed and used as the magnetizing means 10 of the elongation inspection apparatus 1 installed in a different site (building), which contributes to the cost reduction of the elongation inspection apparatus 1.

  The distance between the wire rope 130 and the wall surface 140 varies depending on the size of the elevator car 110, the size of the hoistway, and the like. It is preferable that it can be expanded and contracted to have an appropriate distance.

  As the magnetic detection means 20, a magnetic sensor for detecting the magnetism of the magnetized portion formed by the magnetizing means 10 is used, and the type of the magnetic detection means 20 is not limited as long as the magnetism can be detected. However, if the detection point is not set at a certain position in the magnetic field acting on the magnetic detection means 20 from the magnetized site, accurate distance measurement between the magnetized sites cannot be performed. Therefore, in the magnetic detection means 20, the three magnetic detection heads 21, 22, and 23 are connected in series along the moving direction of the magnetic detection means 20 (the traveling direction of the wire rope 130) on the magnetic detection means support rail 30 described later. It is preferable to use those prepared. As a result, the position where the output difference between the magnetic heads 21 and 23 at both ends becomes zero potential within the range where the output of the central magnetic head 22 exceeds a predetermined set level can be specified as the detection point. As a result, the detection points at each magnetized portion by the magnetic detection means 20 are always constant.

  The magnetic detection means 20 is supported so as to be able to travel along the magnetic detection means support rail 30. The magnetic detection means support rail 30 is attached to the wall surface 140 of the hoistway along the longitudinal direction of the wire rope 130 so as to be substantially parallel to the wire rope 130. If the magnetism detection means 20 is moved along the magnetism detection means support rail 30, magnetism can be detected while the wire rope 130 is stationary.

  The method of moving the magnetic detection means 20 along the magnetic detection means support rail 30 is arbitrary. For example, the magnetic detection means 20 is provided with a drive unit such as a motor, and a pinion (not shown) is provided in the drive unit. In addition, the magnetic detection means support rail 30 itself can be configured by a rack that meshes with the pinion and can be moved.

  The magnetism detecting means 20 is not used when the wire rope 130 is magnetized. Therefore, it is not necessary to always attach the magnetic detection means 20 to the magnetic detection means support rail 30, and it is preferable that the magnetic detection means 20 be removable. By adopting such a structure, the magnetic detection means 20 can be removed and used as the magnetic detection means 20 of the elongation inspection apparatus 1 installed at a different site (building) except during magnetic detection. This contributes to the cost reduction of the device 1.

  The magnetic detection means position measuring means 40 measures the position of the magnetic detection means 20 that moves along the magnetic detection means support rail 30 and is the position at the time when the magnetic detection signal from the magnetic detection means 20 is received. Measure. The position detection means 40 for the magnetic detection means is not particularly limited as long as it can measure the position of the moving magnetic detection means 20, but for example, a light wave range finder can be used. If the reflection plate 24 is provided on the magnetic detection means 20 and the light wave range finder is arranged at the lower end of the support rail 30 for the magnetic detection means, the distance from the light wave range finder to the reflection plate 24 can be measured. A laser distance meter or the like can also be used as the position measuring means 40 for the magnetic detection means.

  The demagnetizing means 50 is provided to demagnetize the magnetism in consideration of unnecessary magnetism remaining in the magnetized wire rope 130. When unnecessary magnetism does not remain in the wire rope 130, it is not necessary to demagnetize, but particularly when re-magnetization is performed, since there is a high possibility that the previous magnetism remains, the demagnetizing means 50. Is preferably provided. In the present embodiment, the magnetizing means 10 is one in which the demagnetizing means 50 is supported on the base portion together with the magnetizing head 11, but the magnetizing means 10 and the demagnetizing means 50 are separate. Of course, it may be a thing. The demagnetizing means 50 is preferably provided so as to be removable in any case. The degaussing means 50 does not need to be used at the time of inspection after the wire rope 130 is demagnetized, so that it can be applied to other stretch inspection devices 1 by making it removable.

  Further, the magnetizing means 10, the magnetic detecting means support rail 30, the magnetic detecting means position measuring means 40, etc. may be individually attached to the wall surface (attachment portion) 140, but a base member (supporting them) in advance. Arranging at a predetermined position (not shown) and unitizing them and attaching them integrally to the wall surface (attachment portion) 140 contributes to simplification of the attachment work.

  The temperature measuring means 60 measures the temperature of the wire rope 130. The wire rope 130 used in the elevator system 100 is configured by, for example, twisting strands made of steel strands around a fiber core, and expands and contracts depending on temperature. For this reason, it is necessary to perform temperature correction in order to measure an accurate actual distance of the wire rope 130. The temperature measuring means 60 may be an infrared thermometer that can measure the temperature of the wire rope 130 in a non-contact manner. However, as a method that can be measured at a lower cost, in the same environment (in the hoistway) as the wire rope 130. A sample wire rope (not shown) of about several tens of centimeters can be arranged, and the temperature of the sample wire rope can be measured with an inexpensive contact-type thermometer to obtain the temperature of the wire rope 130. The temperature is preferably measured at a plurality of locations having different heights in the hoistway where the wire rope 130 travels. When measured at a plurality of locations, for example, an average value thereof can be used for temperature correction.

  The arithmetic control means 70 is connected to each of the magnetizing means 10, the magnetic detecting means 20, the position detecting means 40 for the magnetic detecting means, the demagnetizing means 50, and the temperature measuring means 60 by a wired or wireless communication network 80. While receiving the data or signal output from each means, it is provided so that the data or signal which drives each means can be transmitted.

  The arithmetic control means 70 stores and processes data obtained from the magnetizing means 10, the magnetic detecting means 20, the magnetic detecting means position measuring means 40, the demagnetizing means 50, and the temperature measuring means 60. As shown, the apparatus includes a reference distance data storage unit 71, a temperature correction unit 72, an elongation calculation unit 73, and the like.

  The reference distance data storage unit 71 stores the distance between each magnetized part when the magnetized means 10 forms the magnetized part as reference distance data. The “distance between each magnetized part at the time of forming the magnetized part (reference distance data)” is the distance between the magnetized parts set at the time when the magnetism is applied by the magnetizing means 10 described above. Alternatively, it may be a distance between the respective magnetized sites obtained by performing the measurement again by the position measuring means 40 for the magnetic detection means after all the magnetizing steps to the wire rope 130 are performed. When obtaining the reference distance data, it is preferable that the temperature is measured by the temperature measuring means 60 and the distance corrected by the temperature correcting means 72 described later is stored as reference distance data. .

The temperature correction unit 72 receives the actual distance data between the magnetized portions of the wire rope 130 measured by the magnetic detection unit position measurement unit 40 from the magnetic detection unit position measurement unit 40 and also the temperature measurement unit 60. This is a computer program that receives the measured temperature data of the wire rope 130 and corrects the measured distance data to obtain the corrected distance data. The amount of expansion and contraction due to temperature is calculated using the following formula when steel strands are used:
Expansion / contraction amount = ^Expansion / contraction amount per unit temperature 11.5 × 10 ⁻⁶ mm / ° C.) × Temperature difference: ° C.) × Wire rope length (mm))
Is required.

  The elongation calculating means 73 compares the reference distance data between the magnetized parts read from the reference distance data storage unit 71 with the corrected distance data between the magnetized parts obtained by the temperature correcting means 72 to compare the wire. It is a computer program for calculating the elongation of the rope 130. Since the reference distance data and the correction distance data are obtained for each magnetized part, the extension amount is obtained for each magnetized part. Further, it is of course possible to obtain the elongation amount of the entire wire rope 130 by integrating the elongation amounts between the respective magnetized portions.

  The arithmetic control unit 70 preferably further includes a determination unit 74 and a warning control unit 75. The determination unit 74 is a computer program that determines whether the elongation between the magnetized portions of the wire rope 130 obtained by the elongation calculation unit 73 is equal to or greater than a predetermined value set in advance. The warning control means 75 outputs a command for operating an arbitrary warning means (not shown) when the determination means 74 determines that the elongation between the magnetized portions of the wire rope 130 is equal to or greater than a predetermined value. It is a computer program. The warning means may be any means as long as it can notify the maintenance manager of the elevator system 100 of an abnormal situation that the elongation of the wire rope 130 has reached a predetermined value or more, and examples thereof include sound and warning lights. . Further, when the maintenance manager is in a remote place, an abnormal situation can be notified by displaying a warning screen on the computer, portable terminal, etc. at hand of the maintenance manager.

  Next, a method for inspecting the elongation of the wire rope 130 using the elongation inspection device 1 of the present embodiment will be described.

  First, before magnetizing, the demagnetizing means 50 is driven while the wire rope 130 is running to demagnetize excess magnetism remaining on the wire rope 130. Next, the wire rope 130 traveling at a constant speed is magnetized by applying magnetism from the magnetizing means 10 at predetermined time intervals.

  Next, reference distance data between the magnetized parts is stored in the reference distance data storage unit 71 of the arithmetic control means 70. For example, when the predetermined time is set to 1 second, if the wire rope 130 is run at 1 m / second, the magnetized parts are formed every 1 m, so the reference distance data between the magnetized parts is 1000 as it is. It can be stored as 0.000 mm. However, there may be a slight difference between the magnetized parts due to the swinging of the wire rope 130 during magnetization. Therefore, after the magnetization process, the distance between the magnetized parts is measured again by the magnetic sensor position measurement means 40 in the same manner as in the inspection process described later, and the temperature-corrected data is used as the reference distance data. Is preferably stored as By doing so, the accuracy of the reference distance data between each magnetized part increases.

  In this way, after the magnetizing step is performed and the reference distance data is stored, the inspection is performed after a predetermined period (for example, after several weeks or months). This will be described with reference to FIG.

  In this inspection process, the wire rope 130 is in a stationary state, and the magnetic detection means 20 moves along the magnetic detection means support rails 30, that is, along the longitudinal direction of the wire rope 130, so that the magnetized portions are sequentially formed. Will be detected. At that time, the magnetic detection means position measuring means 40 receives the magnetic detection signal from the magnetic detection means 20 and sequentially measures the position of the magnetic detection means 20 at the time when the magnetism is detected. Thereby, measured distance data between the respective magnetized parts is obtained (S101). For example, each position data on the magnetic detection means support rail 30 of the magnetic detection means 20 at the time when one magnetized part is detected and at the time when the next magnetized part is detected is the position detection means 40 for the magnetic detection means. Assuming that the distances from the two are 1500.00 mm and 2515.00 mm, respectively, the measured distance between the two magnetized parts is 1015.00 mm.

  Further, in the inspection process, the temperature of the sample wire rope is measured by the temperature measuring means 60 and transmitted to the arithmetic control means 70 as temperature data of the wire rope 130 at the time of inspection (S102).

  The temperature correction means 72 of the arithmetic control means 70 corrects the obtained measured distance data between the magnetized parts by referring to the temperature obtained from the temperature measurement means 60 according to the above formula, and obtains corrected distance data. (S103).

  Next, the elongation calculation means 73 reads the reference distance data from the reference distance data storage unit 71 (S104), compares the reference distance data with the correction distance data, and calculates the elongation of the wire rope 130 (S105). For example, the basic distance data between two magnetized parts is 1000.00 mm, the actually measured distance data is 1015.00 mm, and the corrected distance data is 1012.00 mm. Then, the elongation by use between the magnetized portions is 12.00 mm.

  The obtained elongation (for example, 12.00 mm) can be notified to the terminal device of the elevator system maintenance manager via a communication line or the like. It can be determined whether or not replacement is necessary.

  In the case where the determination unit 74 is provided, for example, when the threshold value for determining the elongation between the magnetized parts is set to 10.00 mm, the determination unit 74 determines that the elongation of 12.00 mm is equal to or greater than a predetermined value. Then (in the case of “YES” in S106), the warning control means 75 activates the warning means, for example, a warning sound is sounded (S107). Thereby, even when the maintenance manager is away from the inspection site at the time of inspection, it is possible to notify the abnormal situation. Therefore, the inspection by the elongation inspection apparatus 1 of the present embodiment can be performed regularly and automatically.

  Here, in the above description, the wire rope 130 is run at a constant speed in the longitudinal direction, and the magnetizing means 10 is driven to apply magnetism every time a predetermined time (for example, 1 second) elapses. However, in order to magnetize at an accurate position, it is assumed that the traveling speed of the wire rope 130 is stable. If the traveling speed changes for some reason, it is accurate. Cannot be magnetized at the position. Of course, after magnetizing as described above, there is no problem if the distance between each magnetized part is measured and stored as reference distance data. However, if magnetization can be performed at an accurate position, It is no longer necessary to measure the distance between the magnetized parts.

  Therefore, in order to perform magnetization at an accurate position, the magnetic detection means 20 is provided so as to be fixed at an appropriate position on the magnetic detection means support rail 30, for example, at a position 1000.00 mm away from the magnetization means 10. Preferably it is. The magnetism detecting means 20 is installed so as to be positioned in front of the magnetizing means 10 with respect to the traveling direction of the wire rope 130 (lower side of the elevator hoistway). First, the first magnetized portion is formed by the magnetizing means 10 at an appropriate position of the traveling wire rope 130. When the wire rope 130 travels a distance corresponding to the interval between the magnetizing means 10 and the magnetism detecting means 20, the magnetism detecting means 20 detects the first magnetized portion. When this detection signal is output, the magnetizing means 10 immediately applies magnetism to form the second magnetized portion. Next, when the magnetism detecting means 20 detects the second magnetized part, the magnetizing means 10 is driven to form the third magnetized part. As a result, even if the traveling speed of the wire rope 130 is not constant, the wire rope 130 is magnetized every predetermined distance (for example, 1000.00 mm) corresponding to the distance between the magnetizing means 10 and the magnetic detection means 20. A site will be formed. The detection signal from the magnetic detection means 20 may be transmitted directly to the magnetizing means 10 via the communication network 80 or transmitted to the magnetizing means 10 via the arithmetic control means 70. You may do it.

  Thus, when magnetizing is performed with the magnetizing means 10 and the magnetism detecting means 20 set at a constant distance, the distance between the magnetized parts (for example, 1000.00 mm) at the time of magnetizing is the reference distance. It can be stored as data as it is. However, in this case as well, there is a possibility that a slight error from the measured distance between the magnetized parts may occur due to the swinging of the wire rope 130 during the magnetizing. The magnetic detection means 20 may be moved to measure the distance between each magnetized portion and stored as reference distance data.

  Next, a second embodiment according to the present invention will be described with reference to FIG. In the present embodiment, not only the magnetic detection means 20 but also the magnetizing means 10 is configured to be movable along the longitudinal direction of the wire rope 130. In order to make the magnetizing means 10 movable, a magnetizing means supporting rail (not shown) is newly installed on the wall surface 140 of the hoistway adjacent to the magnetic detecting means supporting rail 30 described above. However, in this embodiment, as shown in FIG. 4, the magnetizing means 10 is supported together with the magnetic detection means 20 so as to be able to travel on the magnetic detection means support rail 30. That is, the present embodiment has a configuration in which the magnetic detection means support rail 30 is also used as a magnetization means support rail. The following “magnetic detection means support rail 30” is used when the magnetization means 10 travels. Means to function as a “support rail for magnetizing means”. Further, in order to measure the position of the magnetizing means 10 on the magnetic detection means support rail 30, a magnetizing means having the same configuration as the magnetic detection means position measuring means 40 is provided at the upper end of the magnetic detection means support rail 30. A position measuring means 41 is disposed.

  According to the present embodiment, since the magnetizing means 10 is supported by the magnetic detection means support rail 30 and is movable along the longitudinal direction of the wire rope 130, the wire rope 130 is stationary. Magnetization can be performed. That is, the wire rope 130 is kept stationary, the magnetizing means 10 is moved along the magnetic detecting means supporting rail 30, the position of the magnetizing means 10 is measured by the magnetizing means position measuring means 41, If the position is reached, magnetization is performed from the magnetizing head 11, so that a magnetized portion can be formed on the wire rope 130 every predetermined distance. In this embodiment, in order to measure the position of the magnetizing means 10, the reflector 12 is provided on the magnetizing means 10 so as to face the position measuring means 41 for the magnetizing means. If the magnetic detection means 20 is detached from the magnetic detection means support rails 30 and the reflector 12 is provided so as to face the magnetic detection means position measurement means 40, the magnetic detection means position measurement means 40 magnetizes the magnetization means. 10 positions can be measured. In this case, it is not necessary to dispose the position measuring means 41 for the magnetizing means.

  According to this embodiment, since it is not necessary to magnetize the wire rope 130 while traveling, instability of the traveling of the wire rope 130 does not affect the accuracy of the magnetized position as in the above embodiment. .

  Further, in the magnetizing step, the magnetizing means 10 is moved at a constant speed along the magnetic detecting means support rail 30 instead of being measured while the position of the magnetizing means 10 is measured by the magnetizing means position measuring means 41. However, it may be magnetized at regular intervals (for example, every second). Also in this case, since the wire rope 130 is stationary, it is possible to magnetize at an accurate position.

  In the inspection process, with the wire rope 130 stationary, the magnetic detection means 20 is moved along the magnetic detection means support rail 30 to measure the distance between the magnetized portions, and the wire rope 130 is stretched. Obtaining is exactly the same as in the first embodiment.

  The present invention is not limited to the embodiments described above. For example, as a method for measuring the position of the magnetizing means 10 or the magnetic detecting means 20 on the magnetic detecting means support rail 30 in each of the above-described embodiments, the rotation of the driving unit for traveling of the magnetizing means 10 or the magnetic detecting means 20 can be used. The number (for example, the number of rotations of the pinion when the support rail 30 for the magnetic detection means is constituted by a rack and the pinion is attached to the magnetizing means 10 or the magnetic detection means 20 as a traveling drive unit) It is also possible to obtain the position.

DESCRIPTION OF SYMBOLS 1 Wire rope elongation test apparatus 10 Magnetizing means 20 Magnetic detecting means 30 Support rail for magnetic detecting means 40 Position measuring means for magnetic detecting means 41 Position measuring means for magnetizing means 50 Demagnetizing means 60 Temperature measuring means 70 Calculation control means 71 Reference distance data storage unit 72 Temperature correction unit 73 Elongation calculation unit 74 Judgment unit 75 Warning control unit 100 Elevator system 110 Elevator car 120 Weight 130 Wire rope

Claims (8)

Magnetizing means for applying magnetism to the wire rope to form a plurality of magnetized portions;
Magnetism detecting means for detecting each magnetized portion of the wire rope applied by the magnetizing means;
A support rail for magnetic detection means for supporting the magnetic detection means movably along the longitudinal direction of the wire rope;
When the magnetism detection means moves along the magnetism detection means support rail to detect the magnetized portions, the position of the magnetism detection means is measured each time the magnetized portions are detected. Measuring means;
Temperature measuring means for measuring the temperature of the wire rope;
At the time of inspection, the measured distance data between the respective magnetized parts calculated based on the position data of the magnetic detection means sequentially measured by the magnetic measurement means position measurement means was measured by the temperature measurement means. Computation control that corrects based on the temperature of the wire rope and compares the corrected distance data with reference distance data that is the distance between each magnetized part at the time of formation of the magnetized part. A wire rope elongation inspection device comprising: means.   The wire rope elongation inspection apparatus according to claim 1, wherein the magnetizing means is configured to apply magnetism to the wire rope at predetermined time intervals. The magnetic detection means can be fixed on the magnetic detection means support rail at a position away from the magnetizing means by a predetermined distance,
When the magnetized means detects the magnetized part immediately before formed on the wire rope by the magnetic detecting means fixed at a predetermined position on the support rail for the magnetic detecting means, the magnetized means The wire rope elongation inspection apparatus according to claim 1, wherein magnetism is applied to form a next magnetized portion. Further, a magnetizing means support rail for supporting the magnetizing means movably along the longitudinal direction of the wire rope;
A position measuring means for magnetizing means for measuring the position of the magnetizing means supported by the support rail for the magnetizing means;
2. The wire lobe according to claim 1, wherein magnetism is applied to the wire rope every time position data of the magnetizing means measured by the magnetizing means position measuring means becomes a value indicating a predetermined position. Elongation inspection device.   The wire rope elongation inspection apparatus according to claim 1, further comprising a demagnetization unit that erases the magnetism of the wire rope before the magnetization by the magnetization unit. The arithmetic control means includes
A reference distance data storage unit that stores the distance between each magnetized part at the time of forming the magnetized part as the reference distance data;
Temperature correction means for correcting the measured distance data between the magnetized portions of the wire rope at the time of inspection using the temperature of the wire rope at the time of inspection to obtain correction distance data; and
Reads the reference distance data between the magnetized parts from the reference distance data storage unit, compares the reference distance data with the correction distance data obtained by the temperature correction means, and calculates the elongation of the wire rope The wire rope elongation test apparatus according to any one of claims 1 to 5, further comprising: means. The arithmetic control means includes
Determining means for determining whether or not the elongation of the wire rope is equal to or greater than a predetermined value by the elongation calculating means;
The wire rope elongation inspection apparatus according to claim 6, further comprising warning control means for operating an arbitrary warning means when the determination means determines that the elongation of the wire rope is equal to or greater than a predetermined value. A wire rope elongation inspection method for inspecting wire rope elongation,
Applying magnetism to the wire rope to form a plurality of magnetized parts in advance,
At the time of inspection, the plurality of magnetized portions of the wire rope are sequentially detected by the magnetic detection means, and the position of the magnetic detection means is measured each time the detection is performed, and the position data of the magnetic detection means is used to measure the position. While measuring the actual distance data between each magnetized part of the wire rope, measure the temperature of the wire rope at the time of inspection,
The measured distance data between the magnetized parts of the wire rope obtained at the time of inspection is corrected based on the temperature of the wire rope, and the corrected distance data is converted into the magnetized parts at the time of forming the magnetized part. A wire rope elongation inspection method for calculating the elongation of the wire rope in comparison with reference distance data which is a distance between them.

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