Elevator system and diagnostic device

Abstract

The frequency calculation unit (21) calculates the passing frequency of the car (1) for each floor through which the car (1) can pass. A load degree calculation unit (22) calculates the degree of load received by the rope (4) from the pulley for each rope position. A load degree calculation unit (24) calculates a load degree corresponding to the threshold value. The life estimation unit (25) estimates the life of the rope (4) on the basis of the elapsed time from the start of use of the rope (4), the highest load degree calculated by the load degree calculation unit (22), and the load degree calculated by the load degree calculation unit (24).

Description

Technical Field

[0001] The invention relates to an elevator system and a diagnostic device. Background Art

[0002] Patent Document 1 describes a device for diagnosing the life of an elevator rope. In the device described in Patent Document 1, the degree of deterioration of each position of the rope is calculated, and the diameter of the rope is estimated based on the degree of deterioration. In addition, the value of the rope diameter measured in the past is also used to estimate the life of the rope.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: International Publication No. 2015 / 029753 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In order to estimate the life of the rope, the diameter values ​​measured in the past are required in the device described in Patent Document 1. Specifically, the amount of change in the diameter must be obtained from the diameter values ​​of the rope measured at different times in the past.

[0008] The present invention has been made to solve the above-mentioned problems. An object of the present invention is to provide an elevator system capable of estimating the life of a rope without using a value of the rope diameter measured in the past, and a diagnostic device that can be used in such an elevator system.

[0009] Another object of the present invention is to provide an elevator system that does not require the use of a value of a rope diameter measured in the past and can reduce the load required to locate the most deteriorated portion of the rope, and a diagnostic device that can be used in such an elevator system.

[0010] Means for solving problems

[0011] The elevator system of the present invention comprises: a car; a rope for suspending the car; a pulley on which the rope is wound; a measuring device for measuring the diameter of the rope; and a diagnostic device. A threshold value of the diameter of the rope for determining the life of the rope is preset. The diagnostic device comprises: a frequency calculation unit for calculating the frequency of the car passing through each floor through which the car can pass; a first load degree calculation unit for calculating the load degree received by the rope from the pulley for each rope position based on the frequency calculated by the frequency calculation unit; a second load degree calculation unit for calculating the load degree corresponding to the threshold value based on the diameter measured by the measuring device and the load degree calculated by the first load degree calculation unit; and a life estimation unit for estimating the life of the rope based on the elapsed time from the start of use of the rope, the highest load degree calculated by the first load degree calculation unit, and the load degree calculated by the second load degree calculation unit.

[0012] The diagnostic device of the present invention is a diagnostic device for a rope suspending an elevator car. The diagnostic device comprises: a frequency calculation unit that calculates the frequency of a car passing through each floor through which the car can pass; a first load degree calculation unit that calculates the load degree of the rope from the pulley around which the rope is wound, for each rope position, based on the frequency calculated by the frequency calculation unit; a second load degree calculation unit that calculates the load degree corresponding to the threshold value of the rope diameter for determining the rope life, based on the actual measurement value of the rope diameter and the load degree calculated by the first load degree calculation unit; and a life estimation unit that estimates the rope life based on the elapsed time from the start of use of the rope, the highest load degree calculated by the first load degree calculation unit, and the load degree calculated by the second load degree calculation unit.

[0013] The elevator system of the present invention comprises: a car; a rope for suspending the car; a pulley for winding the rope; and a diagnostic device. The diagnostic device comprises: a storage unit for storing the number of times the car passes between floors as movement interval information; a frequency calculation unit for calculating the frequency of the car passing between floors that the car can pass based on the movement interval information stored in the storage unit; a first load degree calculation unit for calculating the load degree received by the rope from the pulley for each rope position based on the frequency calculated by the frequency calculation unit; and a position determination unit for determining the rope position of the most deteriorated portion of the rope based on the load degree calculated by the first load degree calculation unit.

[0014] The diagnostic device of the present invention is a diagnostic device for a rope suspending an elevator car. The diagnostic device comprises: a storage unit that stores the number of times the car passes through each floor as movement interval information; a frequency calculation unit that calculates the frequency of the car passing through each floor that the car can pass through based on the movement interval information stored in the storage unit; a first load degree calculation unit that calculates the load degree of the rope from the pulley around which the rope is wound for each rope position based on the frequency calculated by the frequency calculation unit; and a position determination unit that determines the rope position of the most deteriorated part of the rope based on the load degree calculated by the first load degree calculation unit.

[0015] Effects of the Invention

[0016] According to the present invention, in an elevator system, the life of a rope can be estimated without using a value of the rope diameter measured in the past.

[0017] Furthermore, according to the present invention, in the elevator system, it is not necessary to use the value of the diameter of the rope measured in the past, and the load required for determining the position of the most deteriorated portion in the rope can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a diagram showing an example of the elevator system in the first embodiment.

[0019] Figure 2 This is a diagram for explaining the function of the diagnostic device.

[0020] Figure 3 This is a flowchart showing an example of the operation of the diagnostic device.

[0021] Figure 4 This is a diagram showing an example of the passing frequency calculated by the frequency calculation unit.

[0022] Figure 5 This is a diagram for explaining the function of the load degree calculation unit.

[0023] Figure 6 This is a diagram for explaining the function of the load degree calculation unit.

[0024] Figure 7 It is a figure which shows the example of the diameter measured by the measuring device.

[0025] Figure 8 This is a diagram for explaining the function of the load degree calculation unit.

[0026] Fig. 9 It is a figure which shows the example of the diameter measured by the measuring device.

[0027] Fig.10 This is a diagram for explaining the function of the diameter estimation unit.

[0028] Fig.11 This is a diagram for explaining the function of the diameter estimation unit.

[0029] Fig.12 This is a diagram showing another example of the diameter measured by the measuring device.

[0030] Fig.13 This is a diagram for explaining the function of the diameter estimation unit.

[0031] Fig.14 This is a diagram for explaining the function of the diameter estimation unit.

[0032] Fig.15 This is a diagram showing an example of hardware resources of a diagnostic device.

[0033] Fig.16 This is a diagram showing another example of hardware resources of the diagnostic device. DETAILED DESCRIPTION

[0034] The following is a detailed description with reference to the accompanying drawings. The repeated descriptions are appropriately simplified or omitted. In each figure, the same reference numerals represent the same parts or corresponding parts.

[0035] Implementation method 1.

[0036] Figure 1 This is a diagram showing an example of the elevator system in the first embodiment. Figure 1 The elevator system shown has a car 1 and a counterweight 2. The car 1 moves up and down in a hoistway 3. The car 1 and the counterweight 2 are suspended from the hoistway 3 by ropes 4. The ropes 4 are, for example, steel wire ropes. The counterweight 2 moves in the hoistway 3 in a direction opposite to the direction in which the car 1 moves.

[0037] The rope 4 is wound around a driving sheave 6 of a hoisting machine 5. The driving sheave 6 is an example of a pulley around which the rope 4 is wound. The hoisting machine 5 drives the car 1. The control device 7 controls the hoisting machine 5. That is, the movement of the car 1 is controlled by the control device 7.

[0038] Figure 1 An elevator system with a 2:1 winding method is shown as an example. Figure 1 In the example shown, the hoisting machine 5 is arranged at the top of the shaft 3. One end 4a of the rope 4 is supported by a fixed body arranged at the top of the shaft 3. The rope 4 extends downward from the end 4a. The rope 4 is wound around the hanging sheave 8, the driving sheave 6, the hanging sheave 9 and the hanging sheave 10 in sequence from the end 4a side. The other end 4b of the rope 4 is supported by a fixed body arranged at the top of the shaft 3. The hanging sheaves 8 to 10 are another example of pulleys around which the rope 4 is wound.

[0039] The hanging wheel 8 is arranged on the counterweight 2. The hanging wheels 9 and 10 are arranged on the car 1. It is also possible to arrange Figure 1 A further pulley, not shown, on which the rope 4 is wound.

[0040] The measuring device 11 measures the diameter of the rope 4. The measuring device 11 may measure the diameter by any method. For example, the measuring device 11 measures the diameter of the rope 4 by irradiating light to the rope 4. The measuring device 11 may also measure the diameter of the rope 4 by detecting the rotation speed of the drive sheave 6. Figure 1 The example in which the measuring device 11 is installed at the top of the hoistway 3 is shown. As another example, the measuring device 11 may be installed in the car 1. The measuring device 11 may also be installed in other places.

[0041] The diagnosis device 12 is a device for diagnosing the rope 4 . Figure 1 The example in which the diagnosis device 12 is provided as a device different from the control device 7 is shown. As another example, the diagnosis device 12 may be provided as one function of the control device 7.

[0042] Figure 2 1 is a diagram for explaining the functions of the diagnostic device 12. The diagnostic device 12 includes a storage unit 20, a frequency calculation unit 21, a load degree calculation unit 22, a position determination unit 23, a load degree calculation unit 24, and a life estimation unit 25. The storage unit 20 stores a threshold value D_th of the diameter of the rope 4. The threshold value D_th is a threshold value for determining the life of the rope 4. The threshold value D_th is set in advance.

[0043] Below, also refer to Figures 3 to 8 , the functions of this elevator system are explained in detail. Figure 3 It is a flowchart showing an example of the operation of the diagnosis device 12 .

[0044] The car 1 responds to the registered call in normal operation. That is, the car 1 moves from the registered boarding floor to the destination floor to transport the user. Every time the car 1 moves, information on the path along which the car 1 moves is stored in the storage unit 20. Thus, the moving section information of the car 1 is accumulated in the storage unit 20 (S101).

[0045] In the example where the information on the path along which the car 1 moves is stored in the storage unit 20 as the moving section information, for example, the information that the car 1 first moves from the 1st floor to the 4th floor, then from the 4th floor to the 2nd floor, and then from the 2nd floor to the 5th floor is stored as the moving section information in the storage unit 20. As another example, the number of times the car 1 passes between each floor may be stored as the moving section information in the storage unit 20. For example, in each of the following cases, the number of times the car 1 passes between the 3rd floor and the 4th floor is counted.

[0046] When car 1 moves upward from the 3rd floor

[0047] When car 1 moves downward and stops on the 3rd floor

[0048] When car 1 passes through the 3rd floor without stopping at the 3rd floor

[0049] Furthermore, storing the number of times the car 1 passes between floors as the movement section information can reduce the amount of information stored in the storage unit 20 compared to storing information on the route along which the car 1 moves as the movement section information.

[0050] The frequency calculation unit 21 calculates the frequency of passage of the car 1 for each floor through which the car 1 can pass (S102). Figure 4 2 is a diagram showing an example of the passing frequency calculated by the frequency calculation unit 21. Figure 4 In the example shown, the car 1 stops at each of the 1st to 5th floors of the building. Figure 4 An example of calculating the passing frequency of each floor in a manner that the total becomes 1 is shown. The storage unit 20 stores the movement interval information of the car 1 within a certain period. The frequency calculation unit 21 calculates the passing frequency based on the movement interval information of the car 1 stored in the storage unit 20. The above-mentioned certain period may also be about 1 month. In addition, compared with the case where the information on the movement path of the car 1 is stored as the movement interval information, the case where the number of times the car 1 passes between each floor is stored as the movement interval information can reduce the processing load required for calculating the passing frequency.

[0051] The load degree calculation unit 22 calculates the load degree on the rope 4 for each rope position (S103). When the car 1 moves, the rope 4 is subjected to a load from the pulley. The load degree indicates the degree of load on the rope 4. The load degree calculation unit 22 calculates the load degree received from the pulley for each rope position based on the passing frequency calculated by the frequency calculation unit 21. In addition, in the example shown in this embodiment, the rope position is synonymous with the distance from the end 4a on the rope 4. A plurality of rope positions for calculating the load degree may also be pre-set.

[0052] Figure 5 and Figure 6 2 is a diagram for explaining the function of the load degree calculation unit 22. It is known which part of the rope 4 is bent by which pulley when the car 1 moves from one floor to another. The load degree calculation unit 22 first calculates Figure 5 As shown, the degree of load received from each pulley is calculated for each rope position.

[0053] For example, the ratio of load degree L1 to load degree L2 is equal to the ratio of frequency F1 to frequency F2. Load degree L1 is the load degree received from the drive sheave 6 at the portion of the rope 4 that is bent by the drive sheave 6 when the car 1 moves between the 1st and 2nd floors. Load degree L2 is the load degree received from the drive sheave 6 at the portion of the rope 4 that is bent by the drive sheave 6 when the car 1 moves between the 2nd and 3rd floors. Frequency F1 is the frequency of the car 1 passing between the 1st and 2nd floors. Frequency F2 is the frequency of the car 1 passing between the 2nd and 3rd floors. In addition, Figure 5 An example is shown in which each load degree is normalized so that the load degree L1 becomes 1.0.

[0054] in addition, Figure 5 The load calculation unit 22 also calculates the load degree received from each pulley for each rope position based on the specification data. For example, the load received by the rope 4 from the pulley varies depending on the shape of the groove formed in the pulley. The load received by the rope 4 from the pulley also varies depending on the diameter of the pulley. The specification data is stored in the storage unit 20. It is preferred that the specification data include the groove shape of each pulley and the diameter of each pulley. Figure 5 An example is shown in which the load received from the driving sheave 6 when the rope 4 passes through the driving sheave 6 is twice the load received from the hanging sheave 8 when the rope 4 passes through the hanging sheave 8.

[0055] like Figure 6 As shown, the load degree calculation unit 22 calculates the overall load degree at each rope position by adding the load degrees received from each pulley.

[0056] The position specifying unit 23 specifies the rope position P_lmax of the most deteriorated portion in the rope 4 based on the degree of load for each rope position calculated by the load degree calculating unit 22 (S104). Figure 6 The load degree shown corresponds to the degradation distribution of the rope 4. Therefore, the portion where the highest load degree is calculated by the load degree calculation unit 22 is regarded as the most deteriorated portion of the rope 4. The position identification unit 23 identifies the rope position of this portion as the rope position P_lmax. Figure 6 An example is shown in which the center position of the portion where the maximum load degree is calculated is determined as the rope position P_lmax.

[0057] In addition, the diagnostic device 12 determines whether the diameter of the rope 4 has been measured (S105). The diameter of the rope 4 is measured by the measuring device 11. When the diagnostic device 12 receives information on the diameter measured by the measuring device 11, it determines "yes" in S105. Figure 7 1 is a diagram showing an example of the diameter measured by the measuring device 11. The diameter of the end portion 4a and the diameter of the end portion 4b are respectively predetermined values. Figure 7 An example is shown in which the diameters of seven locations between the end portion 4a and the end portion 4b are measured by the measuring device 11.

[0058] If it is determined to be YES in S105, the load degree calculation unit 24 calculates the load degree L_th corresponding to the threshold value D_th based on the diameter of the rope 4 measured by the measuring device 11 and the load degree calculated by the load degree calculation unit 22 (S106).

[0059] Figure 8 2 is a diagram for explaining the function of the load degree calculation unit 24. The load degree at each rope position whose diameter is measured by the measuring device 11 can be obtained from the calculation result of the load degree calculation unit 22. Thus, the load degree calculation unit 24 determines the load degree with respect to the diameter measured by the measuring device 11 and plots Figure 8 The load calculation unit 24 calculates the load based on the actual measured value of the diameter of the rope 4 ( Figure 8 The curve C1 representing the relationship between the diameter of the rope 4 and the load degree is calculated by curve fitting of the black dots shown in FIG. Figure 8 In the example shown, the curve C1 is a cubic curve. The load degree calculation unit 24 calculates the load degree at the intersection of the curve C1 and the threshold value D_th as the load degree L_th.

[0060] The life estimation unit 25 estimates the life of the rope 4 (S107). For example, the life estimation unit 25 estimates the life ΔT of the rope 4 according to the following equation based on the time T, the load degree L_th, and the load degree L_dmin.

[0061] ΔT=T / L_dmin×L_th-T

[0062] The life ΔT is the time taken from the current moment, i.e., the time when the diameter of the rope 4 is measured, until the diameter of the rope 4 reaches the threshold value D_th. The time T is the time elapsed from the start of use of the rope 4 to the current moment. The load degree L_dmin is the load degree to which the portion with the smallest diameter in the rope 4 is subjected. For example, the load degree at the rope position P_lmax determined by the position determination unit 23 is used as the load degree L_dmin. In addition, as described above, the load degree L_th is calculated by the load degree calculation unit 24. In addition, information on the time when the use of the rope 4 is started is stored in the storage unit 20.

[0063] According to the elevator system shown in this embodiment, the rope position P_lmax of the most deteriorated portion in the rope 4 can be determined based on the movement section information of the car 1. Furthermore, the life ΔT of the rope 4 can be estimated based on the movement section information of the car 1.

[0064] Furthermore, when the number of times the car 1 passes between floors is stored in the storage unit 20 as movement section information, the storage capacity and processing load required for determining the rope position P_lmax and estimating the life ΔT of the rope 4 can be further reduced.

[0065] In the elevator system shown in this embodiment, when estimating the life ΔT, it is sufficient to obtain the current value of the diameter of the rope 4, and the value measured in the past is not required. For example, the load calculation unit 24 calculates the curve C1 based on the current value of the diameter of the rope 4. The load calculation unit 24 does not need the past value of the diameter to calculate the curve C1. In addition, when determining the rope position P_lmax, the value of the diameter of the rope 4 measured in the past is also not required.

[0066] In addition, the rope position P_lmax does not necessarily need to be determined when estimating the life ΔT. For example, when estimating the life ΔT of the rope 4, the life estimation unit 25 may use the highest load degree calculated by the load degree calculation unit 22 as the load degree L_dmin.

[0067] In addition, the moving section information of the car 1 is mostly recorded by the control device 7 as a normal function of the elevator. When the elevator system shown in this embodiment is applied to an existing system, if the moving section information of the car 1 is recorded in the system, the life ΔT can be estimated based on the time of the application. If the moving section information of the car 1 is not recorded, after the elevator system shown in this embodiment is applied to the existing system, the moving section information of the car 1 within a certain period can be stored in the storage unit 20. Thereby, the passing frequency can be calculated based on the moving section information of the car 1 stored in the storage unit 20, and the life ΔT can be estimated. In addition, the above-mentioned certain period can also be about 1 month. The moving section information of the car 1 does not need to be information just after the elevator is installed or information just after the rope 4 is replaced.

[0068] Next, other functions that can be adopted by the present elevator system will be described.

[0069] The diagnostic device 12 may further include a diameter estimation unit 26. The diameter estimation unit 26 estimates the diameter of the rope 4. The diameter estimation unit 26 estimates the diameter of each rope position, for example, the diameter of each rope position for which the load degree is calculated by the load degree calculation unit 22. The diameter estimation unit 26 estimates the diameter based on the diameter of the rope 4 measured by the measuring device 11 and the load degree calculated by the load degree calculation unit 22.

[0070] Fig. 9 It is a diagram showing an example of the diameter measured by the measuring device 11. Fig. 9 An example is shown in which the measuring device 11 measures only the diameter of the portion near the end 4a of the rope 4. Fig. 9In the example shown, the diameter of the portion of the rope 4 close to the end 4 b is not measured by the measuring device 11 .

[0071] Fig.10 and Fig.11 2 is a diagram for explaining the function of the diameter estimation unit 26. Figure 8 Similarly to the example shown, the load degree at the rope position where the diameter is measured by the measuring device 11 can be obtained from the calculation result of the load degree calculation unit 22. Thus, the diameter estimation unit 26 determines the load degree relative to the diameter measured by the measuring device 11 and plots Fig.10 The diameter estimation unit 26 performs an estimation based on the actual measured value of the diameter of the rope 4 ( Fig.10 The curve C2 representing the relationship between the diameter of the rope 4 and the load degree is calculated by curve fitting of the black dots shown in FIG. Fig.10 In the example shown, the curve C2 is a cubic curve.

[0072] Next, the diameter estimation unit 26 calculates the diameter for each rope position based on the calculated curve C2. The diameter of the rope 4 with respect to the load degree can be obtained from the curve C2. The load degree for each rope position can be obtained from the calculation result of the load degree calculation unit 22. Fig.11 As shown, the diameter estimation unit 26 estimates the diameter of the rope 4 at each rope position. Fig.11 In the example, the value of the diameter estimated by the diameter estimation unit 26 is expressed as the correction value. Figures 9 to 11 In the example shown, the diameter of the rope 4 can be estimated over the entire area of ​​the rope 4 based on the result of measuring the diameter of a portion of the rope 4 .

[0073] Fig.12 This is a diagram showing another example of the diameter measured by the measuring device 11. Fig.12 An example is shown in which the measuring device 11 measures the diameter at a larger interval relative to the rope length. Fig.12 Although an example is shown in which the diameter measurement is performed at equal intervals by the measuring device 11, the diameter measurement may not be performed at equal intervals.

[0074] Fig.13 and Fig.14 2 is a diagram for explaining the function of the diameter estimation unit 26. Figure 8 Similarly to the example shown, the load degree at the rope position where the diameter is measured by the measuring device 11 can be obtained from the calculation result of the load degree calculation unit 22. Thus, the diameter estimation unit 26 determines the load degree relative to the diameter measured by the measuring device 11 and plots Fig.13 The diameter estimation unit 26 performs an estimation based on the actual measured value of the diameter of the rope 4 ( Fig.13The curve C3 showing the relationship between the diameter of the rope 4 and the load degree is calculated by curve fitting of the black dots shown in FIG. Fig.13 In the example shown, curve C3 is a cubic curve.

[0075] Next, the diameter estimation unit 26 calculates the diameter for each rope position based on the calculated curve C3. The diameter of the rope 4 with respect to the load degree can be obtained from the curve C3. The load degree for each rope position can be obtained from the calculation result of the load degree calculation unit 22. Fig.14 As shown, the diameter estimation unit 26 estimates the diameter of the rope 4 at each rope position. Fig.14 In the example, the value of the diameter measured by the measuring device 11 is represented as the measured value, and the value of the diameter estimated by the diameter estimating unit 26 is represented as the correction value. Figure 12 to Figure 14 In the example shown, the diameter of the rope 4 can be estimated over the entire region of the rope 4 at intervals smaller than the intervals at which the diameter is measured by the measuring device 11 .

[0076] In addition, Figures 9 to 11 The examples shown and Figure 12 to Figure 14 In the example shown, since the actually measured value of the diameter of the rope 4 is used, the environmental conditions of the elevator such as the temperature, humidity, and the amount of dust can be reflected in the estimated value of the diameter.

[0077] Fig.15 1 is a diagram showing an example of hardware resources of the diagnostic device 12. The diagnostic device 12 includes a processing circuit 30 including a processor 31 and a memory 32 as hardware resources. The processing circuit 30 may include a plurality of processors 31. The processing circuit 30 may include a plurality of memories 32.

[0078] In this embodiment, the parts shown by reference numerals 20 to 26 represent the functions of the diagnostic device 12. The functions of the storage unit 20 are implemented by the memory 32. The functions of the parts shown by reference numerals 21 to 26 can be implemented by software, firmware, or a combination of software and firmware described as a program. The program is stored in the memory 32. The diagnostic device 12 implements the functions of the parts shown by reference numerals 21 to 26 by executing the program stored in the memory 32 by the processor 31 (computer).

[0079] The processor 31 is also called a CPU (Central Processing Unit) etc. As the memory 32 , a semiconductor memory etc. can be used.

[0080] Fig.16 FIG. 1 is a diagram showing another example of hardware resources of the diagnostic device 12. Fig.16In the example shown, the diagnostic device 12 has a processing circuit 30 including a processor 31 , a memory 32 and dedicated hardware 33 . Fig.16 The example in which a part of the functions of the diagnostic device 12 is realized by the dedicated hardware 33 is shown. The entire functions of the diagnostic device 12 may be realized by the dedicated hardware 33.

[0081] The hardware resources of the control device 7 and Fig.15 or Fig.16 The example shown is the same. The control device 7 has a processing circuit including a processor and a memory as hardware resources. The control device 7 realizes each function by executing a program stored in the memory by a processor (computer). The control device 7 may also have a processing circuit including a processor, a memory and dedicated hardware as hardware resources. It is also possible to realize part or all of the functions of the control device 7 by dedicated hardware.

[0082] Industrial Applicability

[0083] The diagnostic device of the present invention can be applied to an elevator system in which a car is suspended by ropes.

[0084] Description of symbols

[0085] 1: car; 2: counterweight; 3: hoistway; 4: rope; 4a: end; 4b: end; 5: traction machine; 6: driving sheave; 7: control device; 8-10: hanging pulley; 11: measuring device; 12: diagnostic device; 20: storage unit; 21: frequency calculation unit; 22: load calculation unit; 23: position determination unit; 24: load calculation unit; 25: life estimation unit; 26: diameter estimation unit; 30: processing circuit; 31: processor; 32: memory; 33: dedicated hardware.

Claims

1. An elevator system, wherein: The elevator system has: Car; a rope suspending the car; a pulley around which the rope is wound; a measuring device for measuring the diameter of the rope; and Diagnostic devices, presetting a threshold value of the diameter of the rope for determining the life of the rope, The diagnostic device comprises: a frequency calculation unit for calculating the frequency of passage of the car for each floor through which the car can pass; a first load degree calculation unit that calculates the load degree received by the rope from the pulley for each rope position based on the frequency calculated by the frequency calculation unit; a second load degree calculation unit that calculates a load degree corresponding to the threshold value based on the diameter measured by the measuring device and the load degree calculated by the first load degree calculation unit; as well as A life estimating unit estimates the life of the rope based on an elapsed time from the start of use of the rope, the highest load degree calculated by the first load degree calculating unit, and the load degree calculated by the second load degree calculating unit.

2. The elevator system according to claim 1, wherein: The diagnostic device further includes a diameter estimating unit that estimates a diameter at each rope position where the load factor is calculated by the first load factor calculating unit, based on the diameter measured by the measuring device and the load factor calculated by the first load factor calculating unit.

3. A diagnostic device for a rope suspending an elevator car, wherein: The diagnostic device has: a frequency calculation unit for calculating the frequency of passage of the car for each floor through which the car can pass; a first load degree calculation unit that calculates, for each rope position, a load degree that the rope receives from a pulley around which the rope is wound, based on the frequency calculated by the frequency calculation unit; a second load degree calculation unit that calculates a load degree corresponding to a threshold value of the diameter of the rope for determining the life of the rope based on an actual measurement value of the diameter of the rope and the load degree calculated by the first load degree calculation unit; as well as A life estimating unit estimates the life of the rope based on an elapsed time from the start of use of the rope, the highest load degree calculated by the first load degree calculating unit, and the load degree calculated by the second load degree calculating unit.

4. The diagnostic device according to claim 3, wherein: The diagnostic device further includes a diameter estimating unit that estimates a diameter of each rope position where the load factor is calculated by the first load factor calculating unit, based on an actual measurement value of the rope diameter and the load factor calculated by the first load factor calculating unit.

5. An elevator system, wherein: The elevator system has: Car; a rope suspending the car; a pulley around which the rope is wound; and Diagnostic devices, The diagnostic device comprises: A storage unit storing the number of times the car passes between each floor as movement interval information; a frequency calculation unit that calculates the frequency of passage of the car for each floor through which the car can pass, based on the movement section information stored in the storage unit; a first load degree calculation unit that calculates the load degree received by the rope from the pulley for each rope position based on the frequency calculated by the frequency calculation unit; as well as A position specifying unit specifies a rope position of a most deteriorated portion of the rope based on the load degree calculated by the first load degree calculating unit.

6. A diagnostic device for a rope suspending an elevator car, wherein: The diagnostic device has: A storage unit storing the number of times the car passes between each floor as movement interval information; a frequency calculation unit that calculates the frequency of passage of the car for each floor through which the car can pass, based on the movement section information stored in the storage unit; a first load degree calculation unit that calculates, for each rope position, a load degree that the rope receives from a pulley around which the rope is wound, based on the frequency calculated by the frequency calculation unit; as well as A position specifying unit specifies a rope position of a most deteriorated portion of the rope based on the load degree calculated by the first load degree calculating unit.

Images