Counter clearance measurement system, elevator system including the same, and counter clearance measurement method

Abstract

To save labor for inspection work of an elevator.SOLUTION: An elevator system 1 includes a sensor 5 configured to detect vibration of a car 21 or sound pressure around the car 21, and a control panel 10 for calculating a counter clearance. The control panel 10 acquires the measurement result of the counter clearance in the initial operation and the detection result of the sensor 5 when the car 21 and the counterweight 22 pass each other in the initial operation, calculates the elongation amount of the rope 25 based on the detection result of the sensor 5 when the car 21 and the counterweight 22 pass each other in the initial operation and the detection result of the sensor 5 when the car 21 and the counterweight 22 pass each other in the diagnosis operation, and calculates the counter clearance in the diagnosis operation based on the elongation amount of the rope 25 and the measurement result of the counter clearance in the initial operation.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a counter clearance measurement system, an elevator system including the same, and a counter clearance measurement method. [Background technology]

[0002] The elevator rope stretch detection system disclosed in JP 2020-19645 A (Patent Document 1) includes a measuring device attached to the car that measures acceleration and magnetic flux density, and a determination device that detects abnormalities in the amount of stretch in the rope based on changes in the distance traveled by the car from a predetermined reference position to the position where the car passes the counterweight as the car ascends or descends. According to Patent Document 1, the distance traveled by the car from the reference position is determined by integrating the ascending or descending speed of the car (see paragraph

[0024] of Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-19645 Summary of the Invention [Problem to be solved by the invention]

[0004] In elevator maintenance work, measuring counter clearance is one of the important inspection items. Counter clearance measurement is generally performed by maintenance personnel from elevator maintenance companies. Specifically, the maintenance personnel stop the car at the top floor, go down to the bottom floor using stairs or other means, enter the pit, and actually measure the counter clearance. This inspection work is one of the most time-consuming and labor-intensive tasks. There is always a demand for labor-saving elevator inspection work.

[0005] The present disclosure has been made to solve the above-mentioned problems, and one of the purposes of the present disclosure is to reduce the labor required for elevator inspection work. [Means for solving the problem]

[0006] A counter clearance measurement system according to the present disclosure is installed in an elevator including a car and a counterweight connected to each other by a rope. The counter clearance measurement system includes a sensor configured to detect car vibration or sound pressure around the car, and a calculation processing unit that calculates a counter clearance, which is the distance between the counterweight and a buffer. The calculation processing unit acquires a counter clearance measurement result during initial operation and a sensor detection result when the car and counterweight pass each other during initial operation, calculates rope elongation based on the sensor detection result when the car and counterweight pass each other during initial operation and the sensor detection result when the car and counterweight pass each other during diagnostic operation, and calculates the counter clearance during diagnostic operation based on the rope elongation and the counter clearance measurement result during initial operation.

[0007] An elevator system according to the present disclosure includes a counter clearance measurement system and an elevator.

[0008] A counter clearance measurement method according to the present disclosure is applied to an elevator including a car and a counterweight connected to each other by a rope. The counter clearance measurement method includes the steps of acquiring counter clearance measurement results during initial operation and sensor detection results relating to car vibration or sound pressure around the car when the car and counterweight pass each other during initial operation, calculating an elongation amount of the rope based on the sensor detection results relating to car vibration or sound pressure around the car when the car and counterweight pass each other during initial operation and the sensor detection results when the car and counterweight pass each other during diagnostic operation, and calculating a counter clearance during diagnostic operation based on the elongation amount of the rope and the counter clearance measurement results during initial operation. [Effects of the Invention]

[0009] According to the present disclosure, the labor required for elevator inspection work can be reduced. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a diagram illustrating an example of the overall configuration of an elevator system and an elevator remote inspection system. [Figure 2] FIG. 1 is a diagram illustrating an example of a hardware configuration of an elevator system. [Figure 3] FIG. 1 is a diagram showing a schematic structure of an elevator. [Figure 4] FIG. 10 is a diagram for explaining a decrease in counter clearance. [Figure 5] FIG. 10 is a diagram showing a diagnostic operation for measuring a counter clearance in a diagnostic operation. [Figure 6] FIG. 10 is a diagram showing an example of a waveform acquired by a sensor. [Figure 7] 10 is a flowchart illustrating an example of a processing procedure in an initial operation of a counter clearance measurement method. [Figure 8] 10 is a flowchart showing an example of a processing procedure in a diagnostic operation of a counter clearance measurement method. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, the present embodiment will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals, and description thereof will not be repeated.

[0012] [Embodiment Mode] <Overall structure> 1 is a diagram showing an example of the overall configuration of an elevator system and an elevator remote inspection system. In the following embodiment, a "counter clearance measurement system" according to the present disclosure is incorporated into the elevator system 1. However, the "counter clearance measurement system" according to the present disclosure may be manufactured, sold, etc. separately from the elevator system 1.

[0013] The elevator system 1 includes a control panel 10 and an elevator equipment group 20. The control panel 10 controls various devices included in the elevator equipment group 20. The elevator equipment group 20 includes one or more elevators, multiple hall devices, etc. The configuration of the elevator system 1 will be described in detail later with reference to Figures 2 and 3.

[0014] Hereinafter, it is assumed that elevator system 1 is installed in a building (BLDG). In this case, the building owner concludes a maintenance contract with an elevator maintenance company that operates elevator remote inspection system 3. Maintenance personnel belonging to the elevator maintenance company perform inspection work (maintenance inspection and periodic inspection) of elevator system 1 based on the concluded maintenance contract. The maintenance contract may include remote monitoring or remote inspection as an option.

[0015] Remote monitoring refers to the elevator remote inspection system 3 constantly monitoring for any abnormalities (malfunctions) in the elevator using a communication line. Remote inspection refers to the elevator remote inspection system 3 not only remote monitoring but also using a communication line to inspect whether the elevator's operating status and the operating status of each device are normal, targeting areas required for normal elevator operation.

[0016] Remote inspections include three types of inspections: elevator performance inspections, equipment inspections, and usage status inspections. Performance inspections cover inspection items such as the car's startup status, acceleration / travel status, constant speed running status, deceleration running status, and floor arrival status. Equipment inspections cover inspection items such as the temperature of the machine room or control panel, the status of the control equipment, the status of the destination floor buttons in the car, the status of the intercom, the status of the doors opening and closing, the status of the landing buttons, the status of the door switches, and whether there are any abnormalities in the electromagnetic brakes. Usage status inspections cover inspection items such as the car's travel distance, travel time or number of starts, and the number of times the doors have opened and closed.

[0017] By implementing such remote inspections, the amount of on-site inspection work can be reduced, greatly improving the efficiency of maintenance work. In addition, there are legal provisions that allow the implementation of remote inspections to extend the interval between statutory periodic inspections, further improving the efficiency of maintenance work. For example, in Japan, by implementing the remote inspections listed above, the legally mandated interval for periodic inspections can be reduced from once a month to once every three months.

[0018] The elevator remote inspection system 3 includes, for example, a remote inspection device 31, a management server 32, and a plurality of terminals 33. The remote inspection device 31, the management server 32, and the plurality of terminals 33 are connected to each other via a communication line so as to be able to communicate with each other.

[0019] The remote inspection device 31 is installed in the building BLDG together with the elevator system 1. The remote inspection device 31 is communicatively connected to the elevator system 1 and performs remote inspection of the elevator system 1. The remote inspection device 31 is implemented using, for example, a PLC (Programmable Logic Controller).

[0020] Management server 32 is installed, for example, in a central monitoring center CMC of an elevator maintenance company. Management server 32 manages remote inspection device 31. More specifically, management server 32 sends commands to remote inspection device 31 to execute remote inspections, and acquires the results of remote inspections executed by remote inspection device 31. Management server 32 also manages various data such as customer information for many buildings with which elevator maintenance contracts have been concluded, information on each building, information on the elevator systems installed in each building, and remote inspection results.

[0021] Each of the multiple terminals 33 may be installed in any location. In this example, each terminal 33 is located in the central monitoring center CMC or the building BLDG. The terminal 33 is, for example, a personal computer (PC), a smartphone, or a tablet. In this embodiment, the terminal 33 is used by a maintenance worker of an elevator maintenance company. The terminal 33 is configured to cause the remote inspection device 31 to perform a remote inspection via the management server 32 in accordance with the maintenance worker's operation on an input unit (not shown). The terminal 33 is also configured to display the results of the remote inspection performed by the remote inspection device 31 on a display unit (not shown). However, the user of the terminal 33 is not limited to a maintenance worker, and may be an employee other than the maintenance worker of the elevator maintenance company, or the manager of the building BLDG.

[0022] <Elevator system configuration> Fig. 2 is a diagram showing an example of the hardware configuration of the elevator system 1. In this embodiment, it is assumed that the building BLDG in which the elevator system 1 is installed has five floors. For simplicity, it is also assumed that only one elevator is installed in the building BLDG. The elevator EV1 is a rope-type elevator.

[0023] The control panel 10 includes a car control unit 11. The car control unit 11 includes a control board that controls the elevator equipment group 20. The control board includes a processor 111, a memory 112, and an interface 113. The components of the car control unit 11 are connected via a bus. The control panel 10 corresponds to the "arithmetic processing unit" and the "reporting unit" according to the present disclosure.

[0024] The processor 111 is an arithmetic processing device such as a CPU (Central Processing Unit) or an MPU (Micro-Processing Unit). The memory 112 may include volatile memory such as RAM (Random Access Memory) and rewritable non-volatile memory such as an SSD (Solid State Drive) or flash memory. The memory 112 stores system programs including an OS (Operating System) and control programs including computer-readable code required for arithmetic processing. The processor 111 performs various processes by reading the system programs and control programs and expanding them in the memory 112. While FIG. 2 shows an example in which the each-machine control unit 11 includes one processor 111, the each-machine control unit 11 may include multiple processors. The same applies to the memory 112.

[0025] In this specification, the term "processor" is not limited to a processor in the narrow sense that executes processing using a stored program, but may also include hardwired circuits such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array). Therefore, the term "processor" can also be interpreted as a processing circuitry whose processing is predefined by computer-readable code and / or hardwired circuitry.

[0026] Each car control unit 11 is connected via an interface 113 to various devices in the elevator device group 20 and a remote inspection device 31 (see FIG. 1) so as to be able to communicate with each other.

[0027] The elevator equipment group 20 includes a car 21 of the elevator EV1, a counterweight (balancing weight) 22, a hoist 23, a deflector 24 and a rope (wire rope) 25, landing devices 261 to 265 installed at the landings of each floor from the first to fifth floors, sensors and switches 27, and a sensor 5 installed in the elevator EV1.

[0028] The configuration of the elevator EV1 will be described in Figure 3 and subsequent figures. The individual car control unit 11 is connected to the car 21 of the elevator EV1 and the sensor 5 via a control cable 291. In addition, the individual car control unit 11 is connected to the hall devices 261 to 265 on each floor, and the sensors and switches 27 via a control cable 292.

[0029] Figure 3 is a diagram showing a schematic structure of elevator EV1. A car 21 of elevator EV1 is installed inside a hoistway 4 provided in building BLDG. The car 21 moves up and down in the hoistway 4, moving between floors from the lowest floor (first floor) to the top floor (fifth floor). The car 21 can stop at each floor.

[0030] The counterweight 22 moves in the hoistway 4 in the opposite direction to the car 21. A spacer 221 may be attached to the lower end of the counterweight 22. The counterweight 22 and the spacer 221 are made of, for example, steel.

[0031] A machine room 41 is provided directly above the hoistway 4. In the machine room 41, the hoisting machine 23, the deflector wheel 24, the control panel 10, and the remote inspection device 31 are arranged.

[0032] A pit 42 is provided directly below the elevator shaft 4. In the pit 42, a shock absorber (buffer) 421 that absorbs the impact when the car 21 falls, and a shock absorber 422 that absorbs the impact when the counterweight 22 falls are installed. The top of the shock absorber 422 is located below the landing on the lowest floor.

[0033] Rope 25 has opposite ends (first and second ends) from which car 21 and counterweight 22 are suspended. The first end of rope 25 is connected to car 21 through a passage hole provided in hoistway 4. The second end of rope 25 is connected to counterweight 22 through another passage hole provided in hoistway 4. Rope 25 is hung on hoisting machine 23 and deflector pulley 24.

[0034] The sensor 5 is configured to detect vibrations of the car 21 or sound pressure around the car 21. More specifically, the sensor 5 may be a vibration sensor (which may include a displacement sensor, a speed sensor, or an acceleration sensor). The sensor 5 may also be a sound pressure sensor (microphone). The sensor 5 is installed on the car 21, and in the example shown in FIG. 3, it is installed on the top of the car 21. However, the installation position of the sensor 5 is not particularly limited as long as it can detect vibrations of the car 21 or sound pressure around the car 21. The sensor 5 outputs its detection result (waveform) to the control panel 10. Detection of vibrations or sound pressure by the sensor 5 will be described in detail with reference to FIGS. 5 and 6.

[0035] <Decreased counter clearance> In this embodiment, the counter clearance CL is measured. When a spacer 221 is attached to the lower end of the counterweight 22, the counter clearance CL is the distance (interval) between the spacer 221 and the shock absorber 422. When a spacer 221 is not attached to the lower end of the counterweight 22, the counter clearance CL is the distance between the counterweight 22 and the shock absorber 422.

[0036] Fig. 4 is a diagram for explaining the decrease in counter clearance CL. With reference to Fig. 3 and Fig. 4, both ends of rope 25 are constantly pulled downward by car 21 or counterweight 22. Therefore, as elevator EV1 is in use, rope 25 gradually stretches, which can decrease counter clearance CL.

[0037] When the counter clearance CL falls below the reference value (reference clearance), the maintenance person shortens the rope 25 or removes part or all of the spacer 221 from the counterweight 22. In this way, the counter clearance CL is adjusted so that the counter clearance CL becomes equal to or greater than the reference value.

[0038] Generally, counter clearance is measured by a maintenance technician from an elevator maintenance company. Specifically, the technician stops the car at the top floor, goes down to the bottom floor using the stairs or other means, enters the pit, and actually measures the counter clearance. This inspection work is one of the most time-consuming and labor-intensive tasks. There is a constant demand for labor-saving elevator inspection work.

[0039] Therefore, in this embodiment, in order to automate the measurement of the counter clearance CL, an initial operation and a diagnostic operation are performed. The initial operation can be performed at an early stage (typically when the elevator EV1 is installed) when the elongation of the rope 25 is small. The diagnostic operation is usually performed periodically while the elevator EV1 is in use after the initial operation. However, the diagnostic operation can be performed at any timing in accordance with a command from the management server 32.

[0040] During initial operation, the control panel 10 acquires the detection results (waveform) of the sensor 5 and records them in the memory 112 of each machine control unit 11. In addition, the counter clearance CL is measured (actually measured) by a maintenance person. The control panel 10 records the counter clearance measured by the maintenance person (hereinafter, the one during initial operation will be referred to as "CL0") in the memory 112 of each machine control unit 11.

[0041] In the diagnostic operation, the control panel 10 acquires the detection results of the sensor 5 and records them in the memory 112 of the each-machine control unit 11. Then, the control panel 10 calculates the counter clearance CL in the diagnostic operation based on the detection results of the sensor 5 acquired in the diagnostic operation, the detection results of the sensor 5 acquired in the initial operation, and the counter clearance CL0 in the initial operation. This calculation method will be described in more detail below.

[0042] <Passing By> Fig. 5 is a diagram showing a diagnostic operation for measuring (calculating) the counter clearance CL during the diagnostic operation. With reference to Figs. 3 and 5, in this example, the vertical position of the car 21 on the top floor is defined as the reference position (i.e., position 0). A position vertically downward from the reference position is defined as the position of the car 21.

[0043] During diagnostic operation, the car 21 moves, for example, from the top floor to the bottom floor. During this movement, the car 21 and the counterweight 22 pass each other at some position. At that moment, a pressure change or impact occurs around the car 21, causing the car 21 to vibrate or generating a sound pressure around the car 21 that is greater than normal. A waveform indicating this vibration or sound pressure is acquired using the sensor 5. The position of the car 21 (the moving speed of the car 21 and the time elapsed since the start of movement) is known to the control panel 10. Therefore, based on the waveform of the sensor 5, the control panel 10 can identify the position where the car 21 and the counterweight 22 passed each other (position Z in the figure).

[0044] 6 is a diagram showing an example of a waveform acquired by the sensor 5. The horizontal axis represents the position of the car 21. The vertical axis represents the vibration of the car 21 (more specifically, the vibration in the horizontal direction) and the sound pressure.

[0045] As shown in Figure 6, when the car 21 and counterweight 22 pass each other, the waveform of the sensor 5 fluctuates more than in other regions. From Figure 6, it can be seen that in the initial operation, the car 21 passes each other when its position is Z1, and in the diagnostic operation, the car 21 passes each other when its position is Z2. This indicates that the rope 25 has stretched by twice the difference between Z1 and Z2 (Z1 - Z2). More specifically, the stretch ΔL of the rope 25 is expressed by the following equation (1). ΔL=2×(Z1-Z2) (1)

[0046] The counter clearance CL in the diagnostic operation is smaller than the counter clearance CL0 in the initial operation by the elongation ΔL of the rope 25 (see the following formula (2)). CL=CL0-ΔL (2)

[0047] The counter clearance CL0 in the initial operation is known from a prior measurement by a maintenance person. Therefore, by calculating the elongation ΔL of the rope 25 based on the waveform of the sensor 5, the counter clearance CL in the diagnostic operation can be calculated.

[0048] It will be understood from the waveforms exemplified in FIG. 6 that equivalent results can be obtained whether measuring the vibration of the car 21 or measuring the sound pressure.

[0049] <Processing flow> <<Initial operation>> Fig. 7 is a flowchart showing an example of a processing procedure in the initial operation of the counter clearance measurement method. The processing shown in this flowchart is called from a main routine (not shown) and executed when a predetermined condition is met. Each step is realized by software processing by the control panel 10 (processor 111 in each machine control unit 11 shown in Fig. 2), but may also be realized by hardware (electrical circuitry) arranged in the control panel 10. The same applies to the processing shown in the flowchart in Fig. 8, which will be described later. Hereinafter, steps are abbreviated as S.

[0050] 1, 3, and 7, in S101, the control panel 10 determines whether or not an initial operation command has been received from the management server 32 via the remote inspection device 31. The initial operation command may be generated in response to an operation on the terminal 33 by an operator (or maintenance worker) who installs the elevator EV1. If an initial operation command has not been received (NO in S101), the control panel 10 skips the subsequent processing and returns the processing to the main routine.

[0051] When an initial operation command is received (YES in S101), the control panel 10 controls the hoist 23 so that the car 21 moves to the top floor and stops there (S102). At this time, the counterweight 22 is at the lowest position. The maintenance worker measures the counter clearance CL0 during the initial operation and inputs the measurement result into the terminal 33. Then, the measurement result of the counter clearance CL0 is transmitted from the terminal 33 to the control panel 10 via the remote inspection device 31. The measurement result of the counter clearance CL0 may be transmitted to the management server 32.

[0052] In S103, the control panel 10 records the counter clearance CL0 measured by the maintenance person in S102.

[0053] In S104, the control panel 10 determines whether a movement start command has been received to move the car 21 from the top floor to the bottom floor. After completing the measurement of the counter clearance CL0 and inputting the measurement results, the maintenance worker operates the terminal 33 to output a movement start command. The movement start command is then transmitted from the terminal 33 to the control panel 10 via the remote inspection device 31.

[0054] When a movement start command is received (YES in S104), the control panel 10 controls the hoist 23 so that the car 21 moves from the top floor to the bottom floor, and acquires and records the waveform of the sensor 5 while the car 21 is moving (S105). The control panel 10 may transmit the waveform of the sensor 5 to the management server 32 via the remote inspection device 31. This completes the series of processes.

[0055] <Diagnostic operation> FIG. 8 is a flowchart showing an example of a processing procedure in a diagnostic operation of the counter clearance measurement method.

[0056] 1, 3, and 8, in S201, the control panel 10 determines whether or not a diagnostic operation command has been received from the management server 32 via the remote inspection device 31. The diagnostic operation command may be generated periodically by the management server 32, or may be generated in response to an operation by a maintenance worker on the terminal 33. If a diagnostic operation command has not been received (NO in S201), the control panel 10 skips the subsequent processing and returns the processing to the main routine.

[0057] When the diagnostic operation command is received (YES in S201), the control panel 10 controls the hoisting machine 23 so that the car 21 moves to the top floor and stops there (S202).

[0058] In S203, the control panel 10 controls the hoist 23 so that the car 21 moves from the top floor to the bottom floor, and acquires and records the waveform of the sensor 5 while the car 21 is moving. The control panel 10 may transmit the waveform of the sensor 5 to the management server 32 via the remote inspection device 31.

[0059] In S204, the control panel 10 calculates the elongation ΔL of the rope 25 based on the waveform of the sensor 5 recorded in S203 (see the above formula (1)). Note that the control panel 10 can extract fluctuations in the waveform by performing arithmetic processing on the waveform of the sensor 5 (for example, feature extraction).

[0060] In S205, the control panel 10 calculates the counter clearance CL in the diagnostic operation (see formula (2) above) based on the elongation ΔL of the rope 25 calculated in S204 and the counter clearance CL0 in the initial operation (see S103).

[0061] In S206, the control panel 10 determines whether the counter clearance CL calculated in S205 is less than a predetermined reference value (reference clearance). If the counter clearance CL is less than the reference value (YES in S206), the control panel 10 reports the insufficiency of the counter clearance CL to the management server 32 via the remote inspection device 31 (S207). Thereafter, the control panel 10 returns the process to the main routine. This allows the maintenance person to lengthen the counter clearance CL by shortening the rope 25 or removing the spacer 221.

[0062] On the other hand, if the counter clearance CL is equal to or greater than the reference value (NO in S206), the control panel 10 returns the process to the main routine without issuing the notification in S207.

[0063] Although not shown, the execution entity of S204 to S207 is not limited to the control panel 10. Instead of the control panel 10, the management server 32 may calculate the rope elongation ΔL (see S204) or the counter clearance CL (see S205).

[0064] Although the diagnostic operation has been described as being performed so that the car 21 moves from the top floor to the bottom floor, the diagnostic operation may also be performed so that the car 21 moves from the bottom floor to the top floor.

[0065] As described above, in this embodiment, in both the initial operation and the diagnostic operation, the vibration or sound pressure of the car 21 generated when the car 21 and the counterweight 22 pass each other is detected using the sensor 5, and the waveforms of the sensor 5 are compared to calculate the elongation ΔL of the rope 25. Then, the counter clearance CL in the diagnostic operation is calculated based on the elongation ΔL of the rope 25 and the measurement result of the counter clearance CL0 in the initial operation. As a result, once the counter clearance CL0 is measured in the initial operation, it becomes possible to calculate the counter clearance CL in the diagnostic operation after the initial operation without actually measuring it. Therefore, this embodiment can reduce the labor required for elevator inspection work.

[0066] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present disclosure is defined by the claims, not by the description of the above embodiments, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0067] 1 elevator system, 3 elevator remote inspection system, 4 hoistway, 5 sensor, 10 control panel, 11 each unit control unit, 111 processor, 112 memory, 113 interface, 20 elevator equipment group, 21 car, 22 counterweight, 221 spacer, 23 hoist, 24 deflector, 25 rope, 261-265 landing equipment, 27 switches, 291, 292 control cables, 31 remote inspection device, 32 management server, 33 terminal, 41 machine room, 42 pit, 421, 422 buffer, BLDG building, CMC central monitoring center, EV1 elevator.

Claims

1. A counter clearance measurement system installed in an elevator including a car and a counterweight connected to each other by a rope, a sensor configured to detect vibrations of the car or sound pressure around the car; a calculation processing unit that calculates a counter clearance that is a distance between the counterweight and the shock absorber, The arithmetic processing unit a measurement result of the counter clearance during an initial operation and a detection result of the sensor when the car and the counterweight pass each other during the initial operation are acquired; calculating an elongation of the rope based on a detection result of the sensor when the car and the counterweight pass each other during the initial operation and a detection result of the sensor when the car and the counterweight pass each other during the diagnostic operation; A counter clearance measurement system that calculates the counter clearance in the diagnostic operation based on the elongation of the rope and the measurement results of the counter clearance in the initial operation.

2. The counter clearance measurement system according to claim 1, wherein the calculation processing unit calculates the elongation of the rope based on the distance between the position where the waveform of the sensor fluctuates during the initial operation and the position where the waveform of the sensor fluctuates during the diagnostic operation.

3. The counter clearance measurement system according to claim 1 , wherein the sensor is configured to detect horizontal vibrations of the car.

4. 2. The counter clearance measurement system according to claim 1, further comprising a reporting unit that reports to an external server when the counter clearance in the diagnostic operation falls below a reference value.

5. A counter clearance measurement system according to any one of claims 1 to 3; and the elevator.

6. A method for measuring counter clearance in an elevator including a car and a counterweight connected to each other by a rope, comprising: a step of acquiring a measurement result of a counter clearance during an initial operation, a detection result of a sensor relating to vibration of the car or sound pressure around the car during the initial operation, and the measurement result of the counter clearance during the initial operation; calculating elongation of the rope based on a detection result of the sensor when the car and the counterweight pass each other during the initial operation and a detection result of the sensor when the car and the counterweight pass each other during the diagnostic operation; A counter clearance measurement method comprising: a step of calculating the counter clearance in the diagnostic operation based on the elongation of the rope and the measurement results of the counter clearance in the initial operation.

Images