Elevator system and diagnostic device

Abstract

In the present invention, a frequency computing unit (21), for respective floor intervals that an elevator car (1) can traverse, computes a traversing frequency of the car (1). A load-level computing unit (22) computes the level of load that a cable (4) is receiving through a pulley with respect to each of positions along the cable. A load-level computing unit (24) computes a load level that corresponds to a threshold value. A life estimating unit (25) estimates the life of the cable (4) on the basis of: elapsed time since use of the cable (4) began; the highest load level computed by the load-level computing unit (22); and the load level computed by the load-level computing unit (24).

Description

Elevator system and diagnostic device

[0001] The present disclosure relates to elevator systems and diagnostic devices.

[0002] Patent Document 1 describes a device for diagnosing the lifespan of an elevator rope. The device described in Patent Document 1 calculates the degree of deterioration at each position on the rope and estimates the rope diameter based on the degree of deterioration. The device also estimates the rope lifespan using previously measured rope diameter values.

[0003] International Publication No. 2015 / 029753

[0004] The device described in Patent Document 1 requires previously measured diameter values ​​to estimate the rope's lifespan. Specifically, the amount of change in diameter must be calculated from rope diameter values ​​measured at different times in the past.

[0005] The present disclosure has been made to solve the above-mentioned problems. An object of the present disclosure is to provide an elevator system that can estimate the rope life without the need to use previously measured rope diameter values, and a diagnostic device that can be used in such an elevator system. Another object of the present disclosure is to provide an elevator system that can reduce the load required to identify the location of the most deteriorated portion of the rope without the need to use previously measured rope diameter values, and a diagnostic device that can be used in such an elevator system.

[0006] An elevator system according to the present disclosure includes a 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 a diagnostic device. A threshold value for the rope diameter for determining the rope's lifespan is preset. The diagnostic device includes: a frequency calculation unit that calculates a frequency at which the car passes between each floor through which the car can pass; a first load calculation unit that calculates a load level applied to the rope from the pulley for each rope position based on the frequency calculated by the frequency calculation unit; a second load calculation unit that calculates a load level corresponding to the threshold value based on the diameter measured by the measuring device and the load level calculated by the first load calculation unit; and a lifespan estimation unit that estimates the rope's lifespan based on the time elapsed since the rope began to be used, the highest load level calculated by the first load calculation unit, and the load level calculated by the second load calculation unit.

[0007] A diagnostic device according to the present disclosure is a diagnostic device for a rope suspending an elevator car. The diagnostic device includes: a frequency calculation unit that calculates a frequency at which the car passes between each of the floors that the car can pass; a first load calculation unit that calculates, for each rope position, a load level received by the rope from a pulley around which the rope is wound based on the frequency calculated by the frequency calculation unit; a second load calculation unit that calculates, based on an actual measurement of the rope diameter and the load level calculated by the first load calculation unit, a load level corresponding to a rope diameter threshold value for determining the rope's lifespan; and a lifespan estimation unit that estimates the rope's lifespan based on the elapsed time since the rope began to be used, the highest load level calculated by the first load calculation unit, and the load level calculated by the second load calculation unit.

[0008] An elevator system according to the present disclosure includes a car, a rope suspending the car, a pulley around which the rope is wound, and a diagnostic device. The diagnostic device includes: a memory unit that stores the number of times the car has passed between floors as movement section information; a frequency calculation unit that calculates the frequency at which the car has passed between each of the floors that the car can pass based on the movement section information stored in the memory unit; a first load degree calculation unit that calculates the load degree received by the pulley for each rope position based on the frequency calculated by the frequency calculation unit; and a position identification unit that identifies the rope position of the most deteriorated portion based on the load degree calculated by the first load degree calculation unit.

[0009] A diagnostic device according to the present disclosure is a diagnostic device for a rope suspending an elevator car. The diagnostic device includes: a memory unit that stores the number of times the car has passed between floors as movement section information; a frequency calculation unit that calculates the frequency at which the car has passed between each of the floors that the car can pass through based on the movement section information stored in the memory unit; a first load degree calculation unit that calculates, for each rope position, a load degree received by the rope from the pulley around which the rope is wound based on the frequency calculated by the frequency calculation unit; and a position identification unit that identifies the rope position of the most deteriorated portion based on the load degree calculated by the first load degree calculation unit.

[0010] According to the present disclosure, in an elevator system, it is possible to estimate the rope life without needing to use previously measured rope diameter values. Also, according to the present disclosure, it is possible to eliminate the need to use previously measured rope diameter values ​​in an elevator system and reduce the load required to identify the location of the most deteriorated portion of the rope.

[0011] 1 is a diagram illustrating an example of an elevator system in embodiment 1. FIG. 1 is a diagram illustrating functions of a diagnostic device. FIG. 2 is a flowchart illustrating an example of the operation of the diagnostic device. FIG. 2 is a diagram illustrating an example of a passing frequency calculated by a frequency calculation unit. FIG. 3 is a diagram illustrating functions of a load degree calculation unit. FIG. 4 is a diagram illustrating functions of a load degree calculation unit. FIG. 5 is a diagram illustrating an example of a diameter measured by a measuring device. FIG. 6 is a diagram illustrating functions of a diameter estimation unit. FIG. 7 is a diagram illustrating functions of a diameter estimation unit. FIG. 8 is a diagram illustrating another example of a diameter measured by a measuring device. FIG. 9 is a diagram illustrating functions of a diameter estimation unit. FIG. 10 is a diagram illustrating functions of a diameter estimation unit. FIG. 11 is a diagram illustrating examples of hardware resources of a diagnostic device. FIG. 12 is a diagram illustrating another example of hardware resources of a diagnostic device.

[0012] The following detailed description will be given with reference to the drawings. Duplicate descriptions will be simplified or omitted as appropriate. In each drawing, the same reference numerals indicate the same or corresponding parts.

[0013] Embodiment 1. Figure 1 is a diagram showing an example of an elevator system in embodiment 1. The elevator system shown in Figure 1 includes 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 in the hoistway 3 by a rope 4. The rope 4 is, for example, a wire rope. The counterweight 2 moves in the hoistway 3 in a direction opposite to the direction in which the car 1 moves.

[0014] The rope 4 is wound around a drive sheave 6 of a hoisting machine 5. The drive sheave 6 is an example of a pulley around which the rope 4 is wound. The hoisting machine 5 drives the car 1. A control device 7 controls the hoisting machine 5. That is, the movement of the car 1 is controlled by the control device 7.

[0015] FIG. 1 shows an example of an elevator system using a 2:1 roping method. In the example shown in FIG. 1, a hoist 5 is provided at the top of a hoistway 3. One end 4a of a rope 4 is supported by a fixed body provided at the top of the hoistway 3. The rope 4 extends downward from the end 4a. Starting from the end 4a, the rope 4 is wound around a hoist 8, a driving sheave 6, a hoist 9, and a hoist 10, in that order. The other end 4b of the rope 4 is supported by a fixed body provided at the top of the hoistway 3. The hoists 8 to 10 are other examples of pulleys around which the rope 4 is wound.

[0016] The suspension wheel 8 is provided on the counterweight 2. The suspension wheel 9 and the suspension wheel 10 are provided on the car 1. The elevator system may be provided with other pulleys not shown in Fig. 1, and the rope 4 may be wound around these pulleys.

[0017] The measuring device 11 measures the diameter of the rope 4. Any method may be used for the measuring device 11 to measure the diameter. For example, the measuring device 11 measures the diameter of the rope 4 by shining light onto the rope 4. The measuring device 11 may also measure the diameter of the rope 4 by detecting the number of rotations of the traction sheave 6. FIG. 1 shows an example in which the measuring device 11 is provided at the top of the hoistway 3. As another example, the measuring device 11 may be provided in the car 1. The measuring device 11 may also be provided in another location.

[0018] The diagnostic device 12 is a device for diagnosing the rope 4. Fig. 1 shows an example in which the diagnostic device 12 is provided as a device separate from the control device 7. As another example, the diagnostic device 12 may be provided as one function of the control device 7.

[0019] 2 is a diagram for explaining the functions of the diagnostic device 12. The diagnostic device 12 includes a memory unit 20, a frequency calculation unit 21, a load level calculation unit 22, a position identification unit 23, a load level calculation unit 24, and a lifespan estimation unit 25. A threshold value D_th for the diameter of the rope 4 is stored in the memory unit 20. The threshold value D_th is a threshold value for determining the lifespan of the rope 4. The threshold value D_th is set in advance.

[0020] The functions of this elevator system will be described in detail below with reference to Figures 3 to 8. Figure 3 is a flowchart showing an example of the operation of the diagnostic device 12.

[0021] During normal operation, car 1 responds to registered calls. That is, car 1 moves from the registered boarding floor to the destination floor and transports passengers. Every time car 1 moves, information about the route traveled by car 1 is stored in memory unit 20. As a result, travel section information of car 1 is accumulated in memory unit 20 (S101).

[0022] In an example in which information on the route traveled by car 1 is stored in the memory unit 20 as travel section information, for example, information indicating that car 1 first moved from the first floor to the fourth floor, then moved from the fourth floor to the second floor, and then moved from the second floor to the fifth floor is stored in the memory unit 20 as travel section information. As another example, the number of times car 1 passes between floors may be stored in the memory unit 20 as travel section information. For example, the passage of car 1 between the third and fourth floors is counted in each of the following cases: - When car 1 moves upward from the third floor - When car 1 moves downward and stops at the third floor - When car 1 passes the third floor without stopping there Note that the amount of information stored in the memory unit 20 can be reduced by storing the number of times car 1 passes between floors as travel section information compared to when information on the route traveled by car 1 is stored as travel section information.

[0023] The frequency calculation unit 21 calculates the frequency at which car 1 passes between each of the floors that car 1 can pass through (S102). FIG. 4 is a diagram showing an example of the pass frequency calculated by the frequency calculation unit 21. In the example shown in FIG. 4, car 1 stops at each of the first to fifth floors of a building. FIG. 4 shows an example in which the pass frequency for each floor is calculated so that the sum is 1. The memory unit 20 stores movement section information for car 1 over a certain period of time. The frequency calculation unit 21 calculates the pass frequency based on the movement section information for car 1 stored in the memory unit 20. The certain period of time may be about one month. Note that the processing load required to calculate the pass frequency can be reduced by storing the number of times car 1 passes between each floor as movement section information compared to storing information on the route traveled by car 1 as movement section information.

[0024] 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 receives a load from the pulley. The load degree indicates the degree of load received by 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 the example shown in this embodiment, the rope position is synonymous with the distance from the end 4a on the rope 4. The multiple rope positions for calculating the load degree may be set in advance.

[0025] 5 and 6 are diagrams 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 the load degree received from each pulley for each rope position, as shown in FIG.

[0026] 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 that a portion of the rope 4 that is bent by the traction sheave 6 when the car 1 moves between the first and second floors receives from the traction sheave 6. Load degree L2 is the load degree that a portion of the rope 4 that is bent by the traction sheave 6 when the car 1 moves between the second and third floors receives from the traction sheave 6. Frequency F1 is the frequency at which the car 1 passes between the first and second floors. Frequency F2 is the frequency at which the car 1 passes between the second and third floors. Note that FIG. 5 shows an example in which each load degree is normalized so that load degree L1 is 1.0.

[0027] FIG. 5 also shows an example in which the load level calculation unit 22 calculates the load level 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 memory unit 20. It is preferable that the specification data include the groove shape and diameter of each pulley. FIG. 5 shows an example in which the load received by the drive sheave 6 when the rope 4 passes through the drive sheave 6 is twice the load received from the hoist 8 when the rope 4 passes through the hoist 8.

[0028] As shown in FIG. 6, the load degree calculation unit 22 calculates the overall load degree for each rope position by combining the load degrees received from each pulley.

[0029] The position identifying unit 23 identifies a rope position P_lmax of the most deteriorated portion of the rope 4 based on the load degree for each rope position calculated by the load degree calculation unit 22 (S104). The load degrees shown in FIG. 6 correspond to the deterioration distribution of the rope 4. Therefore, the portion for which the highest load degree is calculated by the load degree calculation unit 22 is considered to be the most deteriorated portion of the rope 4. The position identifying unit 23 identifies the rope position of that portion as the rope position P_lmax. FIG. 6 shows an example in which the center position of the portion for which the highest load degree is calculated is identified as the rope position P_lmax.

[0030] Furthermore, 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. FIG. 7 is a diagram showing an example of diameters measured by the measuring device 11. The diameters of the end 4a and the end 4b are each specified values. FIG. 7 shows an example in which the diameters at seven locations between the end 4a and the end 4b are measured by the measuring device 11.

[0031] If the answer is Yes in S105, the load level calculation unit 24 calculates the load level 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 level calculated by the load level calculation unit 22 (S106).

[0032] FIG. 8 is a diagram for explaining the function of the load level calculation unit 24. The load level at each rope position where the diameter is measured by the measuring device 11 can be obtained from the calculation results of the load level calculation unit 22. As a result, the load level calculation unit 24 identifies the load level for the diameter measured by the measuring device 11 and plots the black dots shown in FIG. 8. The load level calculation unit 24 performs curve fitting based on the actual measured values ​​of the diameter of the rope 4 (black dots shown in FIG. 8) while taking nonlinearity into consideration, and calculates a curve C1 that indicates the relationship between the diameter of the rope 4 and the load level. In the example shown in FIG. 8, the curve C1 is a cubic curve. The load level calculation unit 24 calculates the load level at the intersection of the curve C1 and the threshold value D_th as the load level L_th.

[0033] The lifespan estimation unit 25 estimates the lifespan of the rope 4 (S107). For example, the lifespan estimation unit 25 estimates the lifespan ΔT of the rope 4 based on the time T, the load level L_th, and the load level L_dmin using the following formula: ΔT=T / L_dmin×L_th−T

[0034] The life ΔT is the time it takes from the current time, i.e., from the time 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 elapsed time from when the use of the rope 4 began to the current time. The load level L_dmin is the load level received by the part of the rope 4 with the smallest diameter. For example, the load level at the rope position P_lmax identified by the position identification unit 23 is adopted as the load level L_dmin. As described above, the load level L_th is calculated by the load level calculation unit 24. In addition, information on when the use of the rope 4 began is stored in the memory unit 20.

[0035] In the elevator system described in this embodiment, it is possible to identify the rope position P_lmax of the most deteriorated portion of the rope 4 based on the movement section information of the car 1. Furthermore, it is possible to estimate the life ΔT of the rope 4 based on the movement section information of the car 1.

[0036] Furthermore, if the number of times that car 1 passes between floors is stored in memory unit 20 as moving section information, it is possible to further reduce the memory capacity and processing load required to identify rope position P_lmax and estimate rope 4's life ΔT.

[0037] In the elevator system described in this embodiment, when estimating the life ΔT, it is sufficient to acquire the current value of the diameter of the rope 4, and previously measured values ​​are not required. For example, the load level calculation unit 24 calculates the curve C1 based on the current value of the diameter of the rope 4. The load level calculation unit 24 does not need previously measured values ​​of the diameter to calculate the curve C1. Furthermore, previously measured values ​​of the diameter of the rope 4 are not required when specifying the rope position P_lmax either.

[0038] Furthermore, it is not always necessary to specify the rope position P_lmax when estimating the lifespan ΔT. For example, the lifespan estimation unit 25 may use the highest load level calculated by the load level calculation unit 22 as the load level L_dmin when estimating the lifespan ΔT of the rope 4.

[0039] Furthermore, information about the travel distance of car 1 is often recorded in the control device 7 as a normal function of the elevator. When the elevator system described in this embodiment is applied to an existing system, if the information about the travel distance of car 1 is recorded in that system, it is possible to estimate the lifespan ΔT from the time of application. If the information about the travel distance of car 1 is not recorded, it is sufficient to store the information about the travel distance of car 1 for a certain period in the memory unit 20 after applying the elevator system described in this embodiment to the existing system. This allows the passage frequency to be calculated based on the information about the travel distance of car 1 stored in the memory unit 20, and the lifespan ΔT to be estimated. Note that the certain period may be approximately one month. The information about the travel distance of car 1 does not need to be information from immediately after the elevator is installed or immediately after the rope 4 is replaced.

[0040] Other functions that can be employed by the elevator system are described below.

[0041] The diagnosis 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 for each rope position for which the load degree has been 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 measurement device 11 and the load degree calculated by the load degree calculation unit 22.

[0042] Fig. 9 is a diagram showing an example of diameters measured by the measuring device 11. Fig. 9 shows an example in which only the diameter of a portion of the rope 4 close to the end 4a is measured by the measuring device 11. In the example shown in Fig. 9, the diameter of a portion of the rope 4 close to the end 4b is not measured by the measuring device 11.

[0043] 10 and 11 are diagrams for explaining the function of the diameter estimation unit 26. As in the example shown in FIG. 8 , the load level at the rope position where the diameter is measured by the measuring device 11 can be obtained from the calculation result of the load level calculation unit 22. As a result, the diameter estimation unit 26 identifies the load level for the diameter measured by the measuring device 11 and plots the black dots shown in FIG. 10 . The diameter estimation unit 26 performs curve fitting based on the actual measured values ​​of the diameter of the rope 4 (black dots shown in FIG. 10 ) while taking nonlinearity into consideration, and calculates a curve C2 that shows the relationship between the diameter of the rope 4 and the load level. In the example shown in FIG. 10 , the curve C2 is a cubic curve.

[0044] 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 relative to the load level can be obtained from the curve C2. The load level for each rope position can be obtained from the calculation result of the load level calculation unit 22. As a result, the diameter estimation unit 26 estimates the diameter of the rope 4 at each rope position, as shown in FIG. 11. In FIG. 11, the diameter value estimated by the diameter estimation unit 26 is shown as a correction value. In the examples shown in FIGS. 9 to 11, the diameter of the rope 4 can be estimated over the entire rope 4 from the results of measuring the diameter of a portion of the rope 4.

[0045] Fig. 12 is a diagram showing another example of diameters measured by the measuring device 11. Fig. 12 shows an example in which diameter measurements by the measuring device 11 are performed at rough intervals relative to the rope length. Note that Fig. 12 shows an example in which diameter measurements by the measuring device 11 are performed at equal intervals, but diameter measurements do not have to be performed at equal intervals.

[0046] 13 and 14 are diagrams for explaining the function of the diameter estimation unit 26. As in the example shown in FIG. 8 , the load level at the rope position where the diameter is measured by the measuring device 11 can be obtained from the calculation result of the load level calculation unit 22. As a result, the diameter estimation unit 26 identifies the load level for the diameter measured by the measuring device 11 and plots the black dots shown in FIG. 13 . The diameter estimation unit 26 performs curve fitting based on the actual measured values ​​of the diameter of the rope 4 (black dots shown in FIG. 13 ) while taking nonlinearity into consideration, and calculates a curve C3 that shows the relationship between the diameter of the rope 4 and the load level. In the example shown in FIG. 13 , the curve C3 is a cubic curve.

[0047] 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 relative to the load level can be obtained from the curve C3. The load level for each rope position can be obtained from the calculation result of the load level calculation unit 22. As a result, the diameter estimation unit 26 estimates the diameter of the rope 4 at each rope position, as shown in FIG. 14. In FIG. 14, the diameter value measured by the measuring device 11 is shown as the measured value, and the diameter value estimated by the diameter estimation unit 26 is shown as the corrected value. In the examples shown in FIGS. 12 to 14, the diameter of the rope 4 can be estimated over the entire rope 4 at intervals finer than the intervals at which the diameter was measured by the measuring device 11.

[0048] In addition, in the examples shown in Figures 9 to 11 and the examples shown in Figures 12 to 14, the actual measured value of the diameter of the rope 4 is used, so the environmental conditions of the elevator, such as temperature, humidity, and amount of dust, can be reflected in the estimated value of the diameter.

[0049] 15 is a diagram showing an example of hardware resources of the diagnostic device 12. The diagnostic device 12 includes, as hardware resources, a processing circuit 30 including a processor 31 and a memory 32. The processing circuit 30 may include multiple processors 31. The processing circuit 30 may include multiple memories 32.

[0050] In this embodiment, the units denoted by reference numerals 20 to 26 represent functions possessed by the diagnostic device 12. The function of the storage unit 20 is realized by a memory 32. The functions of the units denoted by reference numerals 21 to 26 can be realized by software written as a program, firmware, or a combination of software and firmware. The program is stored in the memory 32. The diagnostic device 12 realizes the functions of the units denoted by reference numerals 21 to 26 by executing the program stored in the memory 32 by a processor 31 (computer).

[0051] The processor 31 is also called a CPU (Central Processing Unit), etc. The memory 32 may be a semiconductor memory, etc.

[0052] Fig. 16 is a diagram showing another example of hardware resources of the diagnostic device 12. In the example shown in Fig. 16, the diagnostic device 12 includes a processing circuit 30 including a processor 31, a memory 32, and dedicated hardware 33. Fig. 16 shows an example in which some of the functions of the diagnostic device 12 are realized by the dedicated hardware 33. All of the functions of the diagnostic device 12 may also be realized by the dedicated hardware 33.

[0053] The hardware resources of the control device 7 are similar to those of the examples shown in Fig. 15 or 16. The control device 7 includes a processing circuit including a processor and memory as its hardware resources. The control device 7 realizes each function by executing a program stored in the memory using the processor (computer). The control device 7 may include a processing circuit including a processor, memory, and dedicated hardware as its hardware resources. Some or all of the functions of the control device 7 may be realized by dedicated hardware.

[0054] The diagnostic device according to the present disclosure can be applied to an elevator system in which the car is suspended by ropes.

[0055] REFERENCE SIGNS LIST 1 Cage, 2 Counterweight, 3 Hoistway, 4 Rope, 4a End, 4b End, 5 Hoisting machine, 6 Driving sheave, 7 Control device, 8-10 Hoist, 11 Measuring device, 12 Diagnosis device, 20 Memory unit, 21 Frequency calculation unit, 22 Load degree calculation unit, 23 Position identification unit, 24 Load degree calculation unit, 25 Life estimation unit, 26 Diameter estimation unit, 30 Processing circuit, 31 Processor, 32 Memory, 33 Dedicated hardware

Claims

1. Basket, A rope for suspending the cage; A pulley around which the rope is wound; a measuring device for measuring the diameter of the rope; A diagnostic device; Equipped with 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 that calculates a frequency at which the car has passed through each of the floors that the car can pass through; A first load degree calculation unit that calculates a 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 level calculation unit that calculates a load level corresponding to the threshold value based on the diameter measured by the measuring device and the load level calculated by the first load level calculation unit; a lifespan estimation unit that estimates a lifespan of the rope based on an elapsed time from when the use of the rope was started, the highest load level calculated by the first load level calculation unit, and the load level calculated by the second load level calculation unit; A diameter estimation unit that estimates a diameter for each rope position at which the load level is calculated by the first load level calculation unit based on the diameter measured by the measuring device and the load level calculated by the first load level calculation unit; Equipped with an elevator system.

2. A diagnostic device for a rope that suspends an elevator car, comprising: a frequency calculation unit that calculates a frequency at which the car has passed through each of the floors that the car can pass through; A first load degree calculation unit that calculates a load degree received by the rope from a pulley around which the rope is wound, for each rope position, based on the frequency calculated by the frequency calculation unit; A second load level calculation unit that calculates a load level corresponding to a threshold value of the rope diameter for determining a lifespan of the rope based on an actual measurement value of the rope diameter and the load level calculated by the first load level calculation unit; a lifespan estimation unit that estimates a lifespan of the rope based on an elapsed time from when the use of the rope was started, the highest load level calculated by the first load level calculation unit, and the load level calculated by the second load level calculation unit; A diameter estimation unit that estimates a diameter for each rope position at which the load level is calculated by the first load level calculation unit based on an actual measurement value of the diameter of the rope and the load level calculated by the first load level calculation unit; A diagnostic device comprising: