JP5947094B2 - elevator - Google Patents

Description

  The present invention relates to an elevator including a displacement amount calculation unit that calculates a displacement amount between a rotating shaft and a main rope.

  Generally, as a conventional technique of this type of elevator, there is one disclosed in Patent Document 1 below. In the prior art described in Patent Document 1, a first tension detector that detects a rope tension at one end contacting the drive sheave of the main rope and a first tension detector that detects a rope tension at the other end. 2 tension detectors. The ratio of the two rope tensions is calculated to measure the slip amount of the main rope. Further, when the slip amount exceeds a preset rope tension ratio reference set value, the drive device of the drive sheave is configured to be accelerated / decelerated.

  That is, in this patent document 1, it has the function which calculates the tension ratio by measuring the tension | tensile_strength of the both ends of a main rope. Then, a change in the slip requirement of the main rope is detected from the tension ratio, and when the detected value exceeds a preset reference value, the speed command of the drive device is changed to accelerate or decelerate the drive device.

JP 62-205973 A

  In Patent Document 1, a tension ratio is calculated by measuring the tension at both ends of the main rope, a change in the slip requirement of the main rope is detected from the tension ratio, and the detected value exceeds a preset reference value. In such a case, the drive device is accelerated or decelerated. For this reason, in this prior art, although the safety of the elevator at the time of measurement can be confirmed, it is impossible to predict how long it can be used in the future or when the replacement time will be.

  Further, the limit tension ratio varies depending on the elevator load and sheave groove shape, as well as the operation speed and frequency of the car, and the load during operation. Therefore, in the response according to the conventional technique described in Patent Document 1 described above, it is necessary to actually wear the sheaves at the design stage of the elevator and to set a standard for each elevator specification. At the same time, since it is necessary to check the limit tension ratio of the target elevator at least during construction, it may take a long time to check the limit tension ratio and the like.

  The present invention has been made from the above-described prior art, and an object thereof is to provide an elevator capable of predicting a change in the critical tension ratio. For example, an elevator capable of predicting a time when the critical tension ratio falls below an elevator specification value is provided.

In order to solve the above-described problems, the present invention provides a displacement amount calculation unit that calculates a displacement amount between a rotary shaft that is rotationally driven by a hoisting machine, and a main rope wound around the rotary shaft; A tension ratio calculation unit that calculates a tension ratio applied to both ends of the main rope via the rotation shaft, a deviation amount calculated by the deviation amount calculation unit, and a tension ratio calculated by the tension ratio calculation unit Based on a limit tension ratio calculation unit that calculates an allowable limit tension ratio as the tension ratio, and a storage unit that stores the limit tension ratio calculated by the limit tension ratio calculation unit. The ratio calculation unit calculates a change prediction of the limit tension ratio based on a difference between the limit tension ratio at the past measurement and the limit tension ratio at the current measurement stored in the storage unit. It is a feature.

  ADVANTAGE OF THE INVENTION According to this invention, the elevator which can estimate the change of a limit tension ratio can be provided. Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is the schematic of the elevator of Example 1 of this invention. It is a flowchart which shows the process of the said elevator. It is a graph which shows the diagnostic result of the said elevator.

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

  In the present embodiment, an example of an elevator that can predict a change in the limit tension ratio will be described. FIG. 1 is a schematic diagram of an elevator according to the first embodiment.

  As shown in FIG. 1, the elevator 1 is a so-called traction type elevator, and includes a hoistway 2 having a longitudinal direction in the vertical direction. A car 3 is accommodated in the hoistway 2 so as to be movable up and down. The car 3 is connected to a counterweight 5 via a main rope 4 as a main rope in the hoistway 2. The car 3 is configured to travel in the vertical direction in the hoistway 2 by a sheave 6 as a rotating shaft around which the main rope 4 is wound and a hoisting machine 7 that drives the sheave 6. Here, the sheave 6 and the hoisting machine 7 are attached to the upper surface portion in the hoistway 2. The hoisting machine 7 is provided with a hoisting machine encoder 8 serving as a hoisting machine detection unit that detects the amount and direction of rotation of the hoisting machine 7. In addition to the hoisting machine encoder 8, various devices (not shown) related to the traveling of the car 3 are accommodated in the hoistway 2, and these various devices are controlled by a control device 9 as a control panel. It is supposed to be configured.

  Further, the car 3 includes a car moving distance measuring device 10 as a moving distance measuring unit for measuring the moving distance of the car 3 and a car internal mass measurement as a car internal mass measuring part for measuring the mass in the car 3. Device 11. The car movement distance measuring device 10 is different from the hoisting machine encoder 8 and is attached to the lower pulley 10a of the pulleys 10a attached to the upper and lower portions in the hoistway 2, respectively. . Note that a wire 10 b is wound around the pulley 10 a, and a part of the wire 10 b is fixed to the car 3.

  Further, the car 3 is provided with a traction diagnostic device 12 for performing a traction diagnosis between the sheave 6 and the main rope 4 of the hoisting machine 3. The traction diagnostic apparatus 12 includes a deviation amount calculation device 13 as a deviation amount measuring unit that measures the deviation amount between the main rope 4 and the sheave 6. This deviation amount calculation device 13 calculates the deviation amount based on the output from the hoisting machine encoder 8, that is, the output relating to the rotational speed and direction of the sheave 6, and the output from the car movement distance measuring device 10. It is configured to measure. The deviation amount calculation device 13 is a rotation measurement unit that measures the rotation amount of the sheave 6.

  Further, the traction diagnostic device 12 includes a tension ratio calculation device 14 that calculates the tension ratio of the main rope 4 of the elevator 1 at the time of measurement. Specifically, the tension ratio calculating device 14 is based on the mass of the car 3, the mass of the counterweight 5, and the mass in the car 3 measured by the car mass measuring device 11. Calculate the ratio.

  The traction diagnostic device 12 includes a limit tension ratio prediction device 15 as a limit tension ratio calculation unit. This limit tension ratio prediction device 15 uses the deviation amount between the main rope 4 and the sheave 6 measured by the deviation amount calculation device 13 and the tension ratio calculated by the tension ratio calculation device 14 at the time of measurement. The tension ratio prediction line 20 and the limit tension ratio of the elevator 1 are calculated.

Further, the limit tension ratio prediction device 15 is a prediction line of the tension ratio at the time of measurement based on the tension ratio calculated by the tension ratio calculation device 14 and the deviation amount measured by the deviation amount calculation device 13. A tension ratio prediction line 20 is calculated. Further, the limit tension ratio prediction device 15 calculates an allowable limit tension ratio as a tension ratio based on the groove coefficient between the main rope 4 and the sheave 6. Here, this critical tension ratio (T1 / T2) is calculated from the groove factor (f) at the time of measurement and the winding angle (θ) of the main rope 4 around the sheave 6 (T1 / T2 = e ^fθ (where T1). ≧ T2). Further, the groove coefficient between the main rope 4 and the sheave 6 is a coefficient determined from the friction coefficient and the groove shape between the main rope 4 and the sheave 6. Specifically, the groove coefficient between the main rope 4 and the sheave 6 includes the amount of displacement between the main rope 4 and the sheave 6, the tension applied to the left and right of the main rope 4, the elongation coefficient with respect to the load of the main rope 4, and the sheave 6 Is calculated from a predetermined formula using the diameter of the car and the amount of movement of the car 3.

  The traction diagnostic device 12 includes a storage device 16 as a storage unit. The storage device 16 stores the limit tension ratio calculated by the limit tension ratio prediction device 15 and the shift amount and tension ratio used for calculating the limit tension ratio. The storage device 16 stores the travel distance of the car 3 measured by the car travel distance measuring device 10.

  Further, the limit tension ratio prediction device 15 has a function of creating a predicted change value indicating a change in the future limit tension ratio as a limit tension ratio prediction line 22 which is a change prediction diagram as a change prediction of the limit tension ratio. doing. Specifically, the critical tension ratio prediction line 22 is obtained from the control device 9 which is measured by the cage moving distance measuring device 10 and the change in the critical tension ratio at the previous measurement and the change in the critical tension ratio at the current measurement. It is created based on driving conditions such as the driving distance from the past measurement, the loading capacity at each driving, and the total moving distance that is the total value of the moving distance of the car 3.

  Further, the limit tension ratio prediction device 15 predicts a time when the limit tension ratio falls below the specification value of the elevator 1, that is, a replacement time 24 at which replacement of parts such as the sheave 6 is predicted to be necessary and a grace period 25 from the present. To do. Specifically, the replacement time 24 and the grace period 25 are calculated based on the created limit tension ratio prediction line 22 and the operation status acquired from the control device 9, for example, the total travel distance of the car 3. The storage device 16 stores the predicted replacement time 24 and the grace period 25 together with the limit tension ratio prediction line 22 created by the limit tension ratio prediction device 15.

  Furthermore, the traction diagnostic device 12 includes a diagnostic result output device 17 as a diagnostic result creation unit for creating a traction diagnostic result. This diagnostic result output device 17 provides the limit tension ratio prediction line 22, the replacement time 24 and the grace period 25 stored in the storage device 16 to a maintenance company or a customer who maintains the elevator 1 at all times or arbitrarily. Used for The diagnostic result output device 17 has a function of creating a medical certificate in which the limit tension ratio prediction line 22, the replacement time 24, and the grace period 25 stored in the storage device 16 are written as data or printed matter. Yes.

  Further, the traction diagnostic device 12 includes an alarm device 18. When the limit tension ratio calculated at the time of operation by the limit tension ratio prediction device 15 is equal to or less than the tension ratio at the time of maximum loading of the elevator 1, the alarm device 18 notifies the maintenance company and operates the elevator 1. That is, the control device 9 is instructed to stop the service. When the limit tension ratio calculated during operation is equal to or less than the tension ratio when the elevator 1 is fully loaded, the control device 9 stops the car 3 of the elevator 1 at the nearest stop floor and gets off from the car 3 to the passenger. I will guide you. Furthermore, the control device 9 closes the door of the car 3 as soon as it can be confirmed that all the passengers get out of the car 3 and there is no load based on the measurement result of the in-car mass measuring device 11, and thereafter stops the operation. It has an operation stop mechanism as an operation stop part to prohibit. Here, the alarm device 18 may be provided in the elevator 1.

  FIG. 2 is a flowchart showing elevator processing.

  First, when performing the traction diagnosis of the elevator 1, the traction diagnosis device 12 is activated by a remote operation from a management center (not shown), a manual operation by an operator, or the like. Then, the rotation amount of the hoisting machine encoder 8 and the actual movement distance information of the car 3 measured by the car movement distance measurement device 10 are sent from the control device 9 to the deviation amount calculation device 13. The deviation amount calculating device 13 measures the deviation amount between the main rope 4 and the sheave 6 during operation. At the same time, the load information of the car 3 measured by the car mass measuring device 11 is sent to the tension ratio calculating device 14 via the control device 9. The tension ratio calculation device 14 calculates the tension ratio during operation based on the specifications of the elevator 1 such as the mass of the car 3 and the mass of the counterweight 5 (step S1).

  Thereafter, based on the deviation amount measured in step S1 and the calculated tension ratio, the tension ratio prediction line 20 at the time of measurement is calculated by the limit tension prediction device 15, and the limit tension at the time of measurement is calculated. A ratio is calculated (step S2). Further, the limit tension ratio calculated in step S3 is compared with the maximum tension ratio in the specification range of the elevator 1 (step S3).

  When the limit tension ratio is equal to or less than the maximum tension ratio, the limit tension ratio prediction device 15 issues an alarm to the maintenance company via the alarm device 18, and the car 3 is stopped, and the control device 9 The car is stopped at the nearest stop floor at (Step S4). Further, after step 5, the passengers in the car 3 are guided to get out of the car 3. Furthermore, as soon as it is confirmed from the measurement result of the car mass measuring device 11 that all the passengers get out of the car 3 and there is no load of the car 3, the door of the car 3 is closed and the subsequent operation is prohibited. The controller 9 is instructed to stop operation (step S5).

  On the other hand, when the limit tension ratio calculated in step S2 exceeds the maximum tension ratio, the limit tension ratio calculated in step S2 and the deviation amount and tension used in the calculation in step S2. The ratio is stored and stored in the storage device 16 (step S6). Thereafter, as shown in FIG. 3 based on the limit tension ratio at the time of past measurement stored in the storage device 16 and the operation status such as the operation distance from the past measurement and the load capacity at each operation. In addition, a limit tension ratio prediction line 22 of the elevator 1 is created by the limit tension ratio prediction device 15 (step S7).

  Further, based on the limit tension ratio prediction line 22 created by the limit tension ratio prediction device 15 in step S7 and the operation status of the elevator 1, the limit tension ratio becomes equal to or less than the maximum tension ratio in the specification range of the elevator 1. The assumed time, that is, the replacement time 24 and the grace period 25 from the present time are calculated by the limit tension ratio prediction device 15. Then, each of the replacement time 24 and the grace period 25 is stored and stored in the storage device 16 (step S8).

  FIG. 3 is a graph showing the diagnosis result of the elevator.

  FIG. 3 is a two-dimensional diagram in which the X-axis direction is a tension ratio and the Y direction is a shift amount. Further, in FIG. 3, the deviation amount measured by the deviation amount calculation device 13 with respect to the tension ratio calculated by the tension ratio calculation device 14 during operation of the elevator 1 is plotted and displayed as a measurement result 19 on the figure. Is done. In addition, although these measurement results 19 may display only one point on a figure, as shown in FIG. 3, you may display a some point simultaneously.

  Further, in FIG. 3, the tension ratio prediction calculated by the limit tension ratio prediction device 15 based on the tension ratio calculated by the tension ratio calculation device 14 and the deviation amount measured by the deviation amount calculation device 13. Line 20 is displayed on the diagram. Here, each measurement result 19 is plotted on the tension ratio prediction line 20. Next, based on the limit tension ratio and the deviation amount calculated before the measurement date 21 stored in the storage device 16, the limit tension ratio prediction device 15 calculates a limit tension ratio prediction line 22 as a change prediction line. . This critical tension ratio prediction line 22 is displayed on the figure.

  Further, the intersection of the limit tension ratio prediction line 22 and the specification maximum value 23 indicating the allowable value of the tension ratio determined from the specification of the elevator 1 is regarded as the prediction time to reach the specification maximum value 23 and is set as the replacement time 24. The Then, a grace period from the present to the replacement period 24 is a grace period 25, and each of the replacement period 24 and the grace period 25 is displayed on the drawing. Further, the diagram shown in FIG. 3 is outputted as data or a printed matter as a diagnostic document by the diagnostic result output device 17.

  As described above, in the elevator 1 according to this embodiment, the deviation amount is calculated based on the rotation amount of the hoisting machine encoder 8 and the actual movement distance information of the car 3 measured by the car movement distance measuring device 10. The amount of deviation between the main rope 4 and the sheave 6 during operation is measured by the device 13. Further, based on the load information of the car 3 measured by the car mass measuring device 11, the tension ratio calculating device 14 is operated based on the specifications of the elevator 1 such as the weight of the car 3 and the weight of the counterweight 5. The tension ratio is calculated. And based on these shift | offset | difference amount and tension | tensile_strength ratio, the limit tension | tensile_strength at the time of a measurement was calculated in the limit tension | tensile_strength prediction apparatus 15. FIG. Therefore, by confirming this limit tension ratio, the limit tension ratio at the time of measurement can be predicted, and the time when this limit tension ratio falls below the specification value of the elevator 1, that is, the maximum tension ratio can be predicted.

  That is, when the limit tension ratio calculated by the limit tension prediction device 15 is equal to or less than the tension ratio at the time of maximum loading of the elevator 1, the car 3 of the elevator 1 is in the maximum loading state. Therefore, the frictional force between the main rope 4 and the sheave 6 is reduced during operation due to wear of the sheave 6 that is not intended at the time of design, and a relative slip between the main rope 4 and the sheave 6 occurs. It is in the state. Therefore, control must be performed so that the limit tension ratio calculated by the limit tension ratio prediction device 15 does not fall below the specification value of the elevator 1. Therefore, the limit tension ratio is compared with the maximum tension ratio in the specification range of the elevator 1, and when the limit tension ratio is equal to or less than the maximum tension ratio, an alarm is transmitted via the alarm device 18 and the operation of the car 3 is performed. Is stopped by the operation stop mechanism of the control device 9.

  On the other hand, when the limit tension ratio calculated by the limit tension prediction device 15 exceeds the maximum tension ratio, there is no relative slip between the main rope 4 and the sheave 6 during operation, and the replacement is not performed. The time has not come. Therefore, the calculated deviation amount and tension ratio are stored in the storage device 16 together with the limit tension ratio.

  Further, the groove coefficient between the main rope 4 and the sheave 6 of the elevator 1 changes with the change in the shape of the groove due to wear of the sheave 6. Further, the wear speed of the sheave 6 varies greatly depending on the operating distance of the elevator 1 and the loading amount during operation. Therefore, the change in the limit tension ratio at the time of the previous measurement and the change of the limit tension ratio at the time of the current measurement, and the operation status such as the operation distance from the past measurement obtained from the control device 9 and the load amount at each operation Based on this, a limit tension ratio prediction line 22 that is a prediction line of a future limit tension ratio is created by the limit tension ratio prediction device 15.

  As a result, by checking the intersection between the limit tension ratio prediction line 22 created by the limit tension ratio prediction device 15 and the specification maximum value 23 of the elevator 1, the replacement time of the parts such as the sheave 6 of the elevator 1 is changed. 24 and the grace period 25 from now can be known in advance. Therefore, since the maintenance time of the elevator 1 can be set based on the grace period 25 and the parts such as the sheave 6 that need to be replaced and the operator's schedule can be adjusted in advance, the maintenance work and schedule of the elevator 1 can be greatly increased. Can be reduced. Therefore, the maintenance management work of the elevator 1 can be changed from the time schedule base to the condition base. Furthermore, even when the friction of the sheave 6 of the elevator 1 or the friction coefficient between the sheave 6 and the main rope 4 decreases, the elevator 1 can be operated without impairing safety.

  Further, based on the limit tension prediction line 22 created by the limit tension ratio prediction device 15 and the operation status of the elevator 1, the limit tension ratio prediction of the replacement timing 24 of the sheave 6 and the like and the grace period 25 from the present time is performed. The calculation is performed by the device 15. Then, while the replacement time 24 and the grace period 25 are stored in the storage device 16, the diagnosis result output device 17 receives a medical certificate in which the limit tension prediction line 22, the replacement time 24 and the grace period 25 are described, and the printed data. And so on.

  As a result, by checking data output from the diagnosis result output device 17 or printed matter, the time when the limit tension ratio exceeds the tension ratio when the elevator 1 is fully loaded, that is, the sheave 6 of the elevator 1 and the like. You can know the replacement time clearly and reliably. Therefore, based on the limit tension ratio prediction line 22 created by the limit tension ratio prediction device 15, the work time required for maintenance of the elevator 1 is shortened compared to the case where the maintenance worker calculates the replacement time 24 each time. As well as being able to reduce the number of maintenance, the burden on maintenance workers can be reduced.

  Further, when the limit tension ratio calculated by the limit tension ratio prediction device 15 is equal to or less than the maximum tension ratio, the limit tension ratio prediction device 15 issues an alarm to the maintenance company via the alarm device 18. Then, the control device 9 guides the passengers in the car to get off the car 3 while stopping the car at the nearest stop floor. Furthermore, as soon as it is confirmed from the measurement result of the car mass measuring device 11 that all passengers get out of the car 3 and the car 3 is not loaded, the door of the car 3 is closed and the subsequent operation is prohibited by the control device. I tried to make it.

  As a result, it is possible to automatically notify the maintenance company that the limit tension ratio calculated by the limit tension ratio predicting device 15 has become the maximum tension ratio or less, and there is a risk of failure after ensuring the safety of passengers appropriately. It is possible to prohibit the operation of the elevator 1 with Therefore, the maintenance work of the maintenance company can be simplified and the burden on the passenger can be minimized.

  In the first embodiment, for the purpose of obtaining a plurality of different measurement results 19, the displacement amount and the tension ratio between the main rope 4 and the sheave 6 are measured constantly or arbitrarily in a state where the elevator 1 is loaded during normal operation. To do. However, the present invention is not limited to this, and as another embodiment, the present invention is not automatically loaded outside service hours such as midnight or idle time when the elevator 1 is not scheduled to be used. The traction diagnosis operation can be performed. In this case, it is possible to improve the accuracy of the tension ratio prediction line 20 by loading a weight (not shown) on the car 3 to obtain a plurality of different measurement results 19.

  In addition, in the case of performing a diagnostic operation in a state where there is a load during normal operation, the number of passengers and mass of passengers are different for each operation, so it is possible to measure a deviation amount based on different loading amounts, but as other examples For example, during diagnostic operation outside the service hours, the tension of the car 3 is changed by changing the acceleration / deceleration speed, loading a weight (not shown) with a different mass in the car, or vibrating the sheave 6 separately. It is also possible to improve the accuracy of the tension ratio prediction line 20 by measuring the deviation amount by changing the ratio and obtaining a plurality of different measurement results 19. Here, the purpose of improving the accuracy of the tension ratio prediction line 20 is to easily measure the deviation amount based on different loading amounts by measuring the deviation amount during the operation time of the elevator 1 and outside the operation time, respectively. can do.

  Further, only one tension ratio prediction line 20 calculated by the limit tension ratio prediction device 15 may be displayed on the drawing, or a plurality of lines may be displayed as shown in FIG. Furthermore, in the case where a plurality of tension ratio prediction lines 20 are displayed, the tension ratio prediction lines 20 are intended to be easily understood by maintenance personnel and customers who confirm the figure on which the tension ratio prediction lines 20 are displayed. The measurement date 21 may be displayed every time. Further, the measurement date 21 may be displayed so as to hang over or overlap the tension ratio prediction line 20 as shown in FIG. 3, or may be displayed in time series in one place. Optionally, the necessity of display of these measurement dates 21 may be switched.

  And about the specification maximum value 23 which shows the allowable value of the tension ratio determined from the specification of the elevator 1 to be compared with the limit tension ratio prediction line 22, rather than the calculated actual value, It may be displayed with a larger value for the preset allowable error determined from the allowable error at the time of assembly. As a result, although the replacement time 24 and the grace period 25 become shorter, the replacement time 24 and the grace period 25 can be calculated in consideration of tolerances at the time of manufacturing and assembling each part, so that more appropriate maintenance management is performed. be able to. Further, the same effect can be obtained by displaying the replacement time 24 or the grace period 25 earlier or shorter by a preset allowable error.

  In addition, the traction diagnostic device 12 according to the present invention can be configured to enable traction diagnosis of the elevator 1 by connecting to the existing control device 9 of the elevator 1 or the like. Further, in the elevator 1 to which the traction diagnostic device 12 is attached in advance, a traction diagnosis can be automatically performed when the elevator 1 is not in operation or the like by introducing a predetermined maintenance program. . Moreover, it can also be set as the structure which performs a remote diagnosis and remote maintenance by connecting a predetermined | prescribed communication apparatus (not shown).

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. In addition, a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of a certain embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 1 Elevator 3 Car 4 Main rope 6 Sheave 7 Hoisting machine 8 Hoisting machine encoder 9 Control apparatus 10 Car moving distance measuring apparatus 11 Car mass measuring apparatus 13 Deviation amount calculating apparatus 14 Tension ratio calculating apparatus 15 Limit tension ratio predicting apparatus 16 Storage device 17 Diagnostic result output device 22 Limit tension ratio prediction line 24 Replacement time 25 Grace period

Claims (6)

A deviation amount calculation unit for calculating a deviation amount between a rotary shaft that is rotationally driven by a hoisting machine, and a main rope wound around the rotary shaft;
A tension ratio calculation unit for calculating a tension ratio applied to both ends of the main rope via the rotation shaft;
A limit tension ratio calculation unit that calculates an allowable limit tension ratio as the tension ratio based on the shift amount calculated by the shift amount calculation unit and the tension ratio calculated by the tension ratio calculation unit;
A storage unit for storing the limit tension ratio calculated by the limit tension ratio calculation unit,
The limit tension ratio calculation unit calculates a change prediction of the limit tension ratio based on a difference between the limit tension ratio at the time of past measurement stored in the storage unit and the limit tension ratio at the time of current measurement. An elevator characterized by that. The elevator according to claim 1.
A moving distance measuring unit for measuring the moving distance of the car;
The limit tension ratio calculation unit is an exchange time at which the limit tension ratio reaches a predetermined value based on the moving distance of the car measured by the moving distance measuring unit and the change prediction, or the predetermined value. An elevator characterized by calculating the grace period until it reaches. The elevator according to claim 1 or 2,
When the limit tension ratio reaches a predetermined value determined from the maximum load capacity of the car, a control unit is provided that stops the car at the nearest floor and stops the operation after opening the door. elevator. The elevator according to claim 2 ,
An elevator comprising: a diagnostic result creation unit that creates a diagnostic result illustrating the predicted change value of the critical tension ratio and the replacement time or the grace period. The elevator according to claim 1.
A hoisting machine detector for detecting the amount of rotation of the rotating shaft;
A moving distance measuring unit for measuring the moving distance of the car,
The slip amount calculation unit is configured to determine the rotation shaft and the rotation axis based on the rotation amount of the rotation shaft detected by the hoisting machine detection unit and the movement distance of the car measured by the movement distance measurement unit. An elevator characterized by calculating the amount of deviation from the main rope. In the elevator as described in any one of Claims 1, 2, and 5,
A mass measuring unit for measuring the mass in the cage;
The said tension ratio calculation part calculates the tension ratio applied to the both ends of the said main rope based on the mass in the said cage calculated in the said mass measurement part. The elevator characterized by the above-mentioned.

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