Counter clearance measurement system, elevator system equipped therewith, 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 Art

[0002] An elevator rope elongation amount detection system disclosed in Japanese Patent Laid-Open No. 2020-19645 (Patent Document 1) includes a measurement device attached to a car that measures acceleration and magnetic flux density, and a determination device that detects an abnormality in the elongation amount of a rope based on a change in movement distance from a predetermined reference position to a passing position with a counterweight when the car moves up and down. According to Patent Document 1, the movement distance of the car from the reference position is obtained by integral calculation of the ascending and descending speed of the car (see paragraph

[0024] of Patent Document 1).

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] In elevator maintenance work, measurement of counter clearance is one of the important inspection items. Generally, counter clearance measurement is performed by maintenance personnel of an elevator maintenance company. Specifically, the maintenance worker stops the car at the top floor, goes to the bottom floor via stairs or the like, enters the pit, and actually measures the counter clearance. This inspection work is one of the operations that require time and labor. There is always a demand for labor saving in elevator inspection work.

[0005] The present disclosure has been made to solve the above problem, and one object of the present disclosure is to save labor in elevator inspection work. [Means for solving the problem]

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

[0007] The elevator system relating to this disclosure comprises a counter clearance measuring system and an elevator.

[0008] The counter clearance measurement method relating to this disclosure is applicable 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: obtaining the measurement result of the counter clearance in initial operation and the detection result of a sensor regarding the vibration of the car or sound pressure around the car when the car and counterweight pass each other in initial operation; calculating the amount of rope elongation based on the detection result of the sensor regarding the vibration of the car or sound pressure around the car when the car and counterweight pass each other in initial operation and the detection result of the sensor when the car and counterweight pass each other in diagnostic operation; and calculating the counter clearance in diagnostic operation based on the amount of rope elongation and the measurement result of the counter clearance in initial operation. [Effects of the Invention]

[0009] According to this disclosure, elevator inspection work can be streamlined. [Brief explanation of the drawing]

[0010] [Figure 1] This figure shows an example of the overall configuration of an elevator system and an elevator remote inspection system. [Figure 2] This figure shows an example of the hardware configuration of an elevator system. [Figure 3] This is a schematic diagram showing the structure of an elevator. [Figure 4] This diagram illustrates the decrease in counter clearance. [Figure 5] This diagram shows a diagnostic operation to measure the counter clearance during a diagnostic run. [Figure 6] This figure shows an example of a waveform acquired by a sensor. [Figure 7] This flowchart shows an example of the processing procedure during the initial operation of a counter clearance measurement method. [Figure 8] This flowchart shows an example of the processing procedure in the diagnostic operation of the counter clearance measurement method. [Modes for carrying out the invention]

[0011] The embodiment will be described in detail below with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and their descriptions will not be repeated.

[0012] [Embodiment] <Overall Structure> Figure 1 shows an example of the overall configuration of an elevator system and an elevator remote inspection system. In the following embodiment, the "counter clearance measurement system" according to this disclosure is incorporated into the elevator system 1. However, the "counter clearance measurement system" according to this disclosure may be manufactured and sold 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 the various devices included in the elevator equipment group 20. The elevator equipment group 20 includes one or more elevators and multiple landing devices, etc. The configuration of the elevator system 1 will be explained in detail later in Figures 2 and 3.

[0014] The following assumes that elevator system 1 is installed in the building's BLDG. In this case, the building owner enters into 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 checks and periodic inspections) 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 continuously monitoring for any abnormalities (malfunctions) in the elevator using a communication line. Remote inspection refers to the elevator remote inspection system 3 using a communication line, in addition to remote monitoring, to inspect whether the elevator's operating status and the operation of each piece of equipment are normal, focusing on the areas necessary for normal elevator operation.

[0016] Remote inspection includes three types of inspections: elevator performance inspection, equipment inspection, and usage status inspection. In performance inspection, inspection items such as car starting status, accelerated traveling status, constant-speed traveling status, decelerated traveling status, and landing status are inspected. In equipment inspection, inspection items such as the temperature of the machine room or control panel, the status of control equipment, the status of destination floor buttons in the car, the status of the intercom, the door opening and closing status, the status of landing buttons, the status of door switches, and the presence or absence of abnormalities in the electromagnetic brake are inspected. In usage status inspection, inspection items such as the traveling distance, traveling time or number of starts of the car, and the number of door opening and closing operations are inspected.

[0017] Implementation of such remote inspection reduces inspection work at maintenance sites, thereby greatly improving the efficiency of maintenance operations. In addition, there are legal provisions that allow the extension of the implementation cycle of statutory periodic inspection when remote inspection is implemented, which can further improve the efficiency of maintenance operations. For example, in Japan, implementing the remote inspection listed above can reduce the implementation cycle of legally mandated periodic inspection 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 communicatively connected to each other via a communication line.

[0019] The remote inspection device 31 is installed in a 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] The management server 32 is installed, for example, in the central monitoring center (CMC) of an elevator maintenance company. The management server 32 manages the remote inspection device 31. More specifically, the management server 32 sends commands to the remote inspection device 31 to perform remote inspections and retrieves the remote inspection results performed by the remote inspection device 31. The management server 32 also manages various data such as customer information for numerous buildings that have concluded elevator maintenance contracts, information on each building, information on the elevator systems installed in each building, and remote inspection results.

[0021] Each of the multiple terminals 33 can be installed in any location. In this example, each terminal 33 is located in the central monitoring center (CMC) or the building building (BLDG). The terminal 33 is, for example, a PC (Personal Computer), a smartphone, or a tablet. In this embodiment, the terminal 33 is used by maintenance personnel of an elevator maintenance company. The terminal 33 is configured to perform remote inspections on the remote inspection device 31 via the management server 32, in accordance with the maintenance personnel's operations 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 maintenance personnel; it may also be an employee of the elevator maintenance company other than maintenance personnel, or a building building administrator.

[0022] <Elevator System Configuration> Figure 2 shows an example of the hardware configuration of elevator system 1. In this embodiment, it is assumed that the building BLDG in which elevator system 1 is installed is five stories tall. Also, for simplicity, it is assumed that there is only one elevator installed in the building BLDG. Elevator EV1 is a rope-type elevator.

[0023] The control panel 10 includes a car control unit 11. Each car control unit 11 includes a control board for controlling the elevator equipment group 20. The control board includes a processor 111, a memory 112, and an interface 113. The components of each car control unit 11 are connected via a bus. The control panel 10 corresponds to the "arithmetic processing unit" and "notification unit" in this disclosure.

[0024] The processor 111 is an arithmetic processing unit 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 a system program including an OS (Operating System) and a control program including computer-readable code necessary for arithmetic processing. The processor 111 performs various processes by reading the system program and the control program and loading them into the memory 112. Figure 2 shows an example where each control unit 11 includes one processor 111, but each 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 processors that execute processing using stored-program methods, but may also include hardwired circuits such as ASICs (Application Specific Integrated Circuits) and FPGAs (Field-Programmable Gate Arrays). Therefore, the term "processor" can also be interpreted as processing circuitry in which processing is predefined by computer-readable code and / or hardwired circuits.

[0026] Each control unit 11 is connected to various devices within the elevator equipment group 20 and remote inspection devices 31 (see Figure 1) via an interface 113, enabling them to communicate with each other.

[0027] The elevator equipment group 20 includes the elevator car 21 of elevator EV1, counterweights 22, hoisting machine 23, deflection wheel 24 and rope (wire rope) 25, landing devices 261-265 installed at the landings of each floor from the 1st to the 5th floor, sensors and switches 27, and a sensor 5 installed in elevator EV1.

[0028] The configuration of elevator EV1 will be explained in Figure 3 and subsequent figures. Each unit control unit 11 is connected to the elevator car 21 and sensors 5 of elevator EV1 via control cables 291. In addition, each unit control unit 11 is connected to the landing devices 261-265 on each floor, as well as sensors and switches 27, via control cables 292.

[0029] Figure 3 is a schematic diagram showing the structure of elevator EV1. The elevator car 21 of elevator EV1 is installed inside the hoistway 4 provided in the building BLDG. The car 21 moves up and down within the hoistway 4, traveling between floors from the lowest floor (1st floor) to the highest floor (5th floor). The car 21 can stop at each floor.

[0030] The counterweight 22 moves along the hoistway 4 in the opposite direction to the elevator 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 located directly above the elevator shaft 4. The machine room 41 houses a hoisting machine 23, a deflection wheel 24, a control panel 10, and a remote inspection device 31.

[0032] A pit 42 is located directly below the elevator shaft 4. The pit 42 is equipped with a buffer 421 that absorbs the impact if the elevator car 21 falls, and a buffer 422 that absorbs the impact if the counterweight 22 falls. The top of the buffer 422 is located below the landing of the lowest floor.

[0033] The rope 25 has two ends (a first end and a second end) from which the cage 21 and counterweight 22 are suspended. The first end of the rope 25 is connected to the cage 21 through a passage hole provided in the hoistway 4. The second end of the rope 25 is connected to the counterweight 22 through another passage hole provided in the hoistway 4. The rope 25 is hoisted over the hoisting machine 23 and the deflector wheel 24.

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

[0035] <Reduction in 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 (spacing) 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] Figure 4 is a diagram illustrating the decrease in counter clearance CL. Referring to Figures 3 and 4, both ends of the rope 25 are constantly being pulled downward by the car 21 or the counterweight 22. Therefore, the counter clearance CL may decrease as the rope 25 gradually stretches during the period of use of the elevator EV1.

[0037] If the counter clearance CL falls below the standard value (standard clearance), the maintenance worker 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 it is equal to or greater than the standard value.

[0038] Generally, counter clearance is measured by maintenance personnel of the elevator maintenance company. Specifically, the maintenance personnel stop the elevator car at the top floor, go down to the bottom floor by stairs, enter the pit, and actually measure the counter clearance. This inspection is one of the tasks that requires time and effort. There is always a demand for streamlining elevator inspection work.

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

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

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

[0042] <Misunderstanding> Figure 5 shows a diagnostic operation for measuring (calculating) the counter clearance CL during a diagnostic run. Referring to Figures 3 and 5, in this example, the vertical position of the elevator car 21 on the top floor is defined as the reference position (i.e., position 0). The position of the elevator car 21 is defined as the position vertically downward from the reference position.

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

[0044] Figure 6 shows an example of a waveform acquired by sensor 5. The horizontal axis represents the position of cage 21. The vertical axis represents the vibration of cage 21 (more specifically, horizontal vibration) and sound pressure.

[0045] As shown in Figure 6, when the car 21 and the counterweight 22 pass each other, the waveform of the sensor 5 shows a larger fluctuation compared to other regions. From Figure 6, it can be seen that in the initial operation, the passing occurred when the car 21 was at position Z1, and in the diagnostic operation, the passing occurred when the car 21 was at position Z2. This indicates that the rope 25 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 during diagnostic operation is smaller than the counter clearance CL0 during initial operation by the elongation ΔL of the rope 25 (see equation (2) below). CL = CL0 - ΔL ···(2)

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

[0048] Furthermore, as can be seen from the waveforms illustrated in Figure 6, equivalent results can be obtained whether the vibration of the cage 21 is measured or the sound pressure is measured.

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

[0050] Referring to Figures 1, 3, and 7, in S101, the control panel 10 determines whether it has received an initial operation command 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 the worker (or maintenance worker) installing the elevator EV1. If the initial operation command has not been received (NO in S101), the control panel 10 skips the subsequent processing and returns to the main routine.

[0051] Upon receiving an initial operation command (YES in S101), the control panel 10 controls the hoisting machine 23 so that the cage 21 moves to the top floor and stops there (S102). At this time, the counterweight 22 is in its lowest position. The maintenance worker measures the counter clearance CL0 during the initial operation and inputs the measurement result into the terminal 33. The measurement result of the counter clearance CL0 is then 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 also be transmitted to the management server 32.

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

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

[0054] Upon receiving a command to start movement (YES in S104), the control panel 10 controls the hoisting machine 23 so that the elevator car 21 moves from the top floor to the bottom floor, and acquires and records the waveform of the sensor 5 during the movement of the elevator car 21 (S105). The control panel 10 may also 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 Figure 8 is a flowchart showing an example of the processing procedure in the diagnostic operation of the counter clearance measurement method.

[0056] Referring to Figures 1, 3, and 8, in S201, the control panel 10 determines whether it has received a diagnostic operation command 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 it may be generated in response to an operation on the terminal 33 by a maintenance worker. If the diagnostic operation command has not been received (NO in S201), the control panel 10 skips the subsequent processing and returns to the main routine.

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

[0058] In S203, the control panel 10 controls the hoisting machine 23 so that the elevator car 21 moves from the top floor to the bottom floor, and acquires and records the waveform of the sensor 5 during the movement of the elevator car 21. The control panel 10 may also 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 extension ΔL of the rope 25 based on the waveform of the sensor 5 recorded in S203 (see equation (1) above). The control panel 10 can extract waveform fluctuations by performing calculations on the waveform of the sensor 5 (for example, feature extraction).

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

[0061] In S206, the control panel 10 determines whether the counter clearance CL calculated in S205 is less than a predetermined standard value (standard clearance). If the counter clearance CL is less than the standard value (YES in S206), the control panel 10 notifies the management server 32 of the insufficient counter clearance CL via the remote inspection device 31 (S207). After that, the control panel 10 returns to the main routine. This allows maintenance personnel 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 above the standard 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 in the diagram, the entity executing 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] It was explained that the diagnostic operation is performed so that elevator car 21 moves from the top floor to the bottom floor. However, the diagnostic operation may also be performed so that elevator car 21 moves from the bottom floor to the top floor.

[0065] As described above, in this embodiment, during both initial operation and 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 elongation ΔL of the rope 25 is calculated by comparing the waveforms of the sensor 5. 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 during the initial operation, it becomes possible to calculate the counter clearance CL in subsequent diagnostic operations without actually measuring it. Therefore, according to this embodiment, the labor required for elevator inspection can be reduced.

[0066] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of this disclosure is indicated by the claims rather than by the description of the embodiments above, and all modifications within the meaning and scope equivalent to the claims are intended to be included. [Explanation of symbols]

[0067] 1 Elevator system, 3 Remote elevator inspection system, 4 Hoistway, 5 Sensor, 10 Control panel, 11 Unit control unit, 111 Processor, 112 Memory, 113 Interface, 20 Elevator equipment group, 21 Car, 22 Counterweight, 221 Spacer, 23 Hoisting machine, 24 Deflection wheel, 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 Buffers, BLDG Building, CMC Central Monitoring Center, EV1 Elevator.

Claims

1. A counter clearance measuring system installed in an elevator including a car and counterweights connected to each other by ropes, A sensor configured to detect vibrations of the cage or sound pressure around the cage, The system includes a calculation processing unit that calculates the counter clearance, which is the distance between the counterweight and the buffer. The aforementioned arithmetic processing unit is The measurement results of the counter clearance during the initial operation and the detection results of the sensor when the basket and the counterweight pass each other during the initial operation are obtained. Based on the sensor detection results when the basket and the counterweight pass each other during the initial operation and the sensor detection results when the basket and the counterweight pass each other during the diagnostic operation, the elongation of the rope is calculated. A counter clearance measurement system that calculates the counter clearance during the diagnostic operation based on the elongation of the rope and the measurement results of the counter clearance during 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 measuring system according to claim 1, wherein the sensor is configured to detect horizontal vibrations of the cage.

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

5. A counter clearance measuring system according to any one of claims 1 to 3, An elevator system comprising the aforementioned elevator.

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

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