Elevator monitoring device, elevator device, elevator monitoring method, elevator monitoring program, and recording medium

Abstract

The objective is to provide an elevator monitoring device that can more quickly suppress the situation in which the elevator car or counterweight continues to rise even though the descent of one of them is blocked. [Solution] The state determination unit 33 determines that a continuous upward torque state is occurring when the cage 16 is rising despite the counterweight 17 being stopped. The continuous upward torque state is a state in which the counterweight 17 is stopped and torque is being generated in the hoisting machine 12 in the direction that raises the cage 16. When the state determination unit 33 determines that a continuous upward torque state is occurring, the stop command unit 34 generates a stop command to stop the hoisting machine 12.

Description

Technical Field

[0001] The present disclosure relates to an elevator monitoring device, an elevator device, an elevator monitoring method, an elevator monitoring program, and a recording medium.

Background Art

[0002] In a conventional elevator device, a connecting rope is connected between a car and a counterweight. The connecting rope is wound around a sheave. When the lifting distance of the car and the lifting distance of the counterweight are different, the sheave is pulled by the connecting rope and displaced. When the displacement amount of the sheave reaches a set amount, the detection unit outputs a detection signal to the control device. When the detection signal is input, the control device performs control to stop the drive of the hoist (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the conventional elevator device as described above, when the displacement amount of the sheave reaches a set amount, the drive of the hoist is stopped. Therefore, for example, when the descent of the counterweight is blocked and an overwind state occurs, after the counterweight stops, the car ascends a certain amount and then the hoist is stopped. Therefore, there is a risk that the car may exceed the allowable lifting and lowering range.

[0005] This disclosure was made to solve the above-mentioned problems and aims to provide an elevator monitoring device, elevator device, elevator monitoring method, elevator monitoring program, and recording medium that can more quickly suppress the situation in which the downward movement of one of the elevator car or counterweight is prevented while the other continues to rise. [Means for solving the problem]

[0006] The elevator monitoring device according to this disclosure includes a state determination unit that determines whether a continuous upward torque state is occurring, in which the second lifting body, which is either the car or the counterweight, is stopped and torque is being generated in the hoisting machine in the direction of raising the first lifting body, which is the other of the car or the counterweight; and a stop command unit that, when the state determination unit determines that a continuous upward torque state is occurring, generates a stop command to stop the hoisting machine. The elevator monitoring method according to this disclosure includes a state determination step of determining whether a continuous upward torque state is occurring, in which the second lifting body, which is either the car or the counterweight, is stopped and torque is being generated in the hoisting machine in the direction of raising the first lifting body, which is the other of the car or the counterweight; and a stop command step of generating a stop command to stop the hoisting machine if the state determination step determines that a continuous upward torque state is occurring. [Effects of the Invention]

[0007] According to this disclosure, it is possible to suppress, more early on, the situation in which the cage or counterweight continues to rise even though the descent of one of them is prevented. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram showing an elevator system according to Embodiment 1. [Figure 2] This is a block diagram of the control panel shown in Figure 1. [Figure 3]Figure 1 is a diagram showing the configuration when the cage rises and the counterweight hits the counterweight buffer. [Figure 4] Figure 3 is a diagram showing the state in which overwinding occurs in the elevator system. [Figure 5] Figure 2 is a block diagram showing the functions of the elevator monitoring device. [Figure 6] Figure 5 is a flowchart showing the overwinding suppression process by the elevator monitoring device. [Figure 7] This is a block diagram showing the functions of the elevator monitoring device according to Embodiment 2. [Figure 8] This block diagram shows the functions of the elevator monitoring device according to Embodiment 3. [Figure 9] This is a block diagram showing a first modified example of Embodiments 1 to 3. [Figure 10] This is a block diagram showing a second modified example of Embodiments 1 to 3. [Figure 11] This diagram shows a first example of a processing circuit that implements each function of the elevator control device and elevator monitoring device according to Embodiments 1 to 3. [Figure 12] This diagram shows a second example of a processing circuit that implements each function of the elevator control device and elevator monitoring device according to Embodiments 1 to 3. [Modes for carrying out the invention]

[0009] The embodiments will be described below with reference to the drawings. Embodiment 1. Figure 1 is a schematic diagram showing an elevator system according to Embodiment 1. The elevator system of Embodiment 1 is a 2:1 roping type machine room-less elevator.

[0010] At the top of the hoistway 11, a hoisting machine 12 is installed. The hoisting machine 12 has a hoisting machine main body 13 and a driving sheave 14. The hoisting machine main body 13 has a hoisting machine motor (not shown) and a hoisting machine brake (not shown). The hoisting machine motor rotates the driving sheave 14. The hoisting machine brake holds the driving sheave 14 in a stationary state. Also, the hoisting machine brake brakes the rotation of the driving sheave 14.

[0011] A suspension body 15 is wound around the driving sheave 14. As the suspension body 15, a plurality of ropes or a plurality of belts are used. The suspension body 15 has a first end portion 15a and a second end portion 15b. The first end portion 15a is one end portion in the longitudinal direction of the suspension body 15. The second end portion 15b is the other end portion in the longitudinal direction of the suspension body 15.

[0012] The car 16 is suspended in the hoistway 11 by the suspension body 15. The counterweight 17 is suspended in the hoistway 11 by the suspension body 15 on the side opposite to the car 16 with respect to the driving sheave 14. The first lifting body of the first embodiment is the car 16. The second lifting body of the first embodiment is the counterweight 17.

[0013] The car 16 and the counterweight 17 move up and down in the hoistway 11 by rotating the driving sheave 14.

[0014] At the lower part of the car 16, a first car suspension pulley 18a and a second car suspension pulley 18b which is a movable pulley are provided. At the upper part of the counterweight 17, a counterweight suspension pulley 19 is provided.

[0015] At the upper part of the hoistway 11, a first rope fixing portion 21 and a second rope fixing portion 22 are provided. The first end portion 15a is connected to the first rope fixing portion 21. The second end portion 15b is connected to the second rope fixing portion 22.

[0016] The suspension body 15 is wound around the first car suspension pulley 18a, the second car suspension pulley 18b, the drive sheave 14, and the counterweight suspension pulley 19 in order from the first end 15a side and reaches the second end 15b.

[0017] The first wire fixing portion 21 is provided with a first tension measuring device 23. The first tension measuring device 23 outputs a signal corresponding to the tension acting on the portion of the suspension body 15 on the car 16 side rather than the hoist 12 side.

[0018] The second wire fixing portion 22 is provided with a second tension measuring device 24. The second tension measuring device 24 outputs a signal corresponding to the tension acting on the portion of the suspension body 15 on the counterweight 17 side rather than the hoist 12 side.

[0019] A plurality of shackle springs (not shown) are provided in the first wire fixing portion 21 and the second wire fixing portion 22, respectively. Each shackle spring expands and contracts according to the tension acting on the suspension body 15.

[0020] As the first tension measuring device 23 and the second tension measuring device 24, for example, a displacement sensor can be used. The displacement sensor detects the displacement of the end portion of the corresponding shackle spring. When a displacement sensor is used, the tension value is calculated by multiplying the displacement amount by the spring constant of the shackle spring.

[0021] Note that the first tension measuring device 23 and the second tension measuring device 24 are not limited to displacement sensors, and may be, for example, load measuring devices provided at the first end 15a and the second end 15b, respectively.

[0022] A car buffer 25 is installed directly below the car 16 at the bottom of the hoistway 11. A counterweight buffer 26 is installed directly below the counterweight 17 at the bottom of the hoistway 11.

[0023] A control panel 27 is installed in the hoistway 11.

[0024] Figure 2 is a block diagram of the control panel 27 shown in Figure 1. The control panel 27 is equipped with an elevator control device 28 and an elevator monitoring device 30.

[0025] The elevator control device 28 controls the operation of the elevator car 16 by controlling the hoisting machine 12. The elevator monitoring device 30 monitors the status of the elevator system. The elevator control device 28 and the elevator monitoring device 30 may be configured as separate devices or as a single device.

[0026] Figure 3 is a diagram showing the state in which the cage 16 in Figure 1 has risen and the counterweight 17 has hit the counterweight buffer 26. In this state, if the output torque of the hoisting machine 12 in the direction of raising the cage 16 is small, the rotation of the drive sheave 14 will stop.

[0027] From the state shown in Figure 3, as the output torque of the hoisting machine 12 increases in the direction that raises the cage 16, the tension of the suspension body 15 on the counterweight 17 side relative to the drive sheave 14 decreases. After this, if the output torque increases further, the drive sheave 14 will either slip freely relative to the suspension body 15, or the drive sheave 14 will not slip and the cage 16 will rise further.

[0028] In particular, when the lifting stroke is large and the weight of the suspension body 15 is large, the traction force acting between the drive sheave 14 and the suspension body 15 is large, which can result in a condition where the cage 16 rises even though the counterweight 17 is stopped, a so-called overwinding condition.

[0029] Figure 4 is a diagram showing the state in which overwinding occurs in the elevator device shown in Figure 3. In this state, the car 16 rises by Δh from the state in Figure 3, and slack occurs in the part of the suspension body 15 that is on the side of the counterweight 17 rather than the drive sheave 14.

[0030] When such an overwinding condition occurs, there is a risk that the elevator car 16 may rise beyond its permissible lifting range. Overwinding can also occur if the counterweight 17 hits some kind of obstacle in the elevator shaft 11.

[0031] In contrast, the elevator monitoring device 30 of Embodiment 1 prevents the elevator car 16 from continuing to rise even though the descent of the counterweight 17 is blocked.

[0032] Figure 5 is a block diagram showing the functions of the elevator monitoring device 30 in Figure 2. The elevator monitoring device 30 has a location information acquisition unit 31, a storage unit 32, a state determination unit 33, and a stop command unit 34 as functional blocks.

[0033] The position information acquisition unit 31 acquires first position information and second position information. The first position information is information regarding the vertical position of the elevator car 16 within the elevator shaft 11. The second position information is information regarding the vertical position of the counterweight 17 within the elevator shaft 11.

[0034] Although not shown in Figure 1, the elevator system is equipped with a first position detection device 35 and a second position detection device 36. The first position detection device 35 detects the vertical position of the car 16 within the hoistway 11. The second position detection device 36 detects the vertical position of the counterweight 17 within the hoistway 11.

[0035] The location information acquisition unit 31 acquires first location information from the first location detection device 35. The location information acquisition unit 31 also acquires second location information from the second location detection device 36.

[0036] The first position detection device 35 can be a governor encoder, a displacement sensor, a laser sensor, an acceleration sensor, a camera, a hoisting machine encoder, etc. The second position detection device 36 can be a governor encoder, a displacement sensor, a laser sensor, an acceleration sensor, a camera, etc. An absolute position measurement system can be used as the displacement sensor.

[0037] The memory unit 32 stores the first location information and the second location information acquired by the location information acquisition unit 31.

[0038] The state determination unit 33 determines, based on the first position information and the second position information, that a continuous upward torque state is occurring when the cage 16 is rising despite the counterweight 17 being stopped. The continuous upward torque state is a state in which the counterweight 17 is stopped and torque is being generated in the hoisting machine 12 in the direction that raises the cage 16.

[0039] When the state determination unit 33 determines that a continuous upward torque condition is occurring, the stop command unit 34 issues a stop command to stop the hoisting machine 12. When the stop command unit 34 issues a stop command, the power supply to the hoisting machine motor and the hoisting machine brake is forcibly cut off.

[0040] Figure 6 is a flowchart of the overwinding suppression process performed by the elevator monitoring device 30 in Figure 5. When the overwinding suppression process is started, the elevator monitoring device 30 acquires first position information and second position information in step S101. Subsequently, in step S102, the elevator monitoring device 30 determines whether a continuous upward torque state is occurring.

[0041] If a continuous upward torque condition does not occur, the elevator monitoring device 30 returns to the process of step S101.

[0042] If a continuous upward torque condition occurs, the elevator monitoring device 30 issues a stop command and terminates the overwinding suppression process.

[0043] The elevator monitoring method of Embodiment 1 includes a status determination step and a stop command step.

[0044] The state determination step is a step to determine whether a continuous upward torque state is occurring. The stop command step is a step to issue a stop command to stop the hoisting machine 12 if the state determination step determines that a continuous upward torque state is occurring.

[0045] Furthermore, the elevator monitoring method of Embodiment 1 includes a location information acquisition step. The location information acquisition step is a step of acquiring first location information and second location information.

[0046] Furthermore, in the state determination step of Embodiment 1, based on the first position information and the second position information, if the cage 16 is rising despite the counterweight 17 being stopped, it is determined that a continuous upward torque state is occurring.

[0047] In such elevator monitoring devices 30, elevator devices, and elevator monitoring methods, it is determined whether a continuous upward torque state is occurring, and if it is determined that a continuous upward torque state is occurring, a stop command is issued.

[0048] Therefore, even though the downward movement of the counterweight 17 is prevented, the upward movement of the cage 16 can be suppressed more quickly.

[0049] Furthermore, in Embodiment 1, based on the first and second position information, it is detected that the cage 16 is rising even though the counterweight 17 is stopped. Therefore, with a simple configuration that does not use compensating ropes, tensioners, etc., the hoisting machine 12 can be quickly stopped at the initial stage when the continuous rising torque condition occurs.

[0050] The elevator monitoring program in Embodiment 1 is a program that causes a computer to execute the elevator monitoring method in Embodiment 1.

[0051] Furthermore, the recording medium of Embodiment 1 is a computer-readable recording medium that stores an elevator monitoring program that causes a computer to execute the elevator monitoring method of Embodiment 1.

[0052] Embodiment 2. Next, Figure 7 is a block diagram showing the functions of the elevator monitoring device 30 according to Embodiment 2. The elevator monitoring device 30 of Embodiment 2 has a tension information acquisition unit 37 instead of the position information acquisition unit 31 in Embodiment 1.

[0053] The tension information acquisition unit 37 acquires tension information from the second tension measuring device 24 either directly or via the elevator control device 28. The tension information is information on the tension value of the portion of the suspension body 15 that is on the counterweight 17 side of the hoisting machine 12.

[0054] The memory unit 32 stores the tension information acquired by the tension information acquisition unit 37. The memory unit 32 also stores the tension setting value.

[0055] The state determination unit 33 determines, based on the tension information acquired by the tension information acquisition unit 37, that a continuous upward torque state is occurring when the tension value of the portion of the suspension body 15 on the counterweight 17 side of the hoisting machine 12 falls below the tension set value.

[0056] The tension setting is set to a value that is lower than the lower limit of the fluctuation in tension value during normal operation of the cage 16, and higher than the tension value due to the self-weight of the suspension body 15 when the counterweight 17 is in contact with the counterweight buffer 26.

[0057] The tension value during normal operation of the elevator car 16 is caused by the acceleration and deceleration of the car 16, drive losses, etc. The tension value due to the weight of the suspension body 15 is maximum when the counterweight buffer 26 is pushed down by the counterweight 17.

[0058] When the state determination unit 33 determines that a continuous upward torque state is occurring, the stop command unit 34 generates a stop command to stop the hoisting machine 12.

[0059] The elevator monitoring method of Embodiment 2 includes a tension information acquisition step, which is a step of acquiring the above-mentioned tension information.

[0060] Furthermore, in the state determination step of Embodiment 2, based on the tension information, if the tension value of the portion of the suspension body 15 on the counterweight 17 side of the hoisting machine 12 falls below the tension set value, it is determined that a continuous upward torque state is occurring.

[0061] Other configurations and processes in Embodiment 2 are the same as in Embodiment 1.

[0062] In such elevator monitoring devices 30, elevator devices, and elevator monitoring methods, it is determined that a continuous upward torque state is occurring when the tension value included in the tension information falls below the tension set value.

[0063] Therefore, with a simple configuration, the hoisting machine 12 can be stopped before an overwinding condition actually occurs. Consequently, it is possible to more reliably prevent the cage 16 from continuing to rise even though the descent of the counterweight 17 is being prevented.

[0064] The elevator monitoring program in Embodiment 2 is a program that causes a computer to execute the elevator monitoring method in Embodiment 2.

[0065] Furthermore, the recording medium of Embodiment 2 is a computer-readable recording medium that stores an elevator monitoring program that causes a computer to execute the elevator monitoring method of Embodiment 2.

[0066] Embodiment 3. Next, Figure 8 is a block diagram showing the functions of the elevator monitoring device 30 according to Embodiment 3. The elevator monitoring device 30 of Embodiment 3 has a control information acquisition unit 38 instead of the position information acquisition unit 31 in Embodiment 1.

[0067] The control information acquisition unit 38 acquires control information from the elevator control device 28. The control information includes load rate information and torque information. The load rate information is information regarding the load rate of the elevator car 16. The torque information is information regarding the magnitude of the torque output by the hoisting machine 12.

[0068] The elevator car 16 is equipped with a weighing device (not shown). The weighing device generates a signal corresponding to the load rate of the elevator car 16. The signal from the weighing device is input to the elevator control device 28. The elevator control device 28 calculates the load rate of the elevator car 16 based on the signal from the weighing device.

[0069] The memory unit 32 stores the control information acquired by the control information acquisition unit 38.

[0070] The state determination unit 33 calculates the torque set value based on the control information acquired by the control information acquisition unit 38. The state determination unit 33 then determines that a continuous upward torque state is occurring when the torque value output by the hoisting machine 12 becomes equal to or greater than the torque set value.

[0071] The torque setting value is set to a torque value such that the tension in the part of the suspension body 15 on the counterweight 17 side becomes the tension setting value shown in Embodiment 2. Since the output torque of the hoisting machine 12 also changes depending on the load rate of the cage 16, the torque setting value is updated each time the load rate changes.

[0072] Furthermore, the torque setting value is calculated from the weight of the car 16 and the weight of the equipment other than the suspension body 15 on the counterweight 17 side. In other words, the torque setting value is calculated from the specification data for each elevator and the load rate of the car 16.

[0073] The elevator monitoring method of Embodiment 3 includes a control information acquisition step, which is a step of acquiring the above-mentioned control information.

[0074] Furthermore, in the state determination step of Embodiment 3, based on the control information, it is determined that a continuous upward torque state is occurring when the torque value output by the hoisting machine 12 becomes equal to or greater than the torque set value.

[0075] Other configurations and processes in Embodiment 3 are the same as in Embodiment 1.

[0076] In this elevator monitoring device 30, elevator system, and elevator monitoring method, it is determined that a continuous upward torque state is occurring when the torque value output by the hoisting machine 12 exceeds a torque setting value. The torque setting value is set based on the load rate of the elevator car 16.

[0077] Therefore, with a simple configuration, the hoisting machine 12 can be stopped before an overwinding condition actually occurs. Consequently, it is possible to more reliably prevent the cage 16 from continuing to rise even though the descent of the counterweight 17 is being prevented.

[0078] Furthermore, in a typical traction-type elevator system, data on the load rate of the elevator car 16 and the output torque data of the hoisting machine 12 are acquired by the elevator control device 28. Therefore, according to Embodiment 3, the hoisting machine 12 can be stopped at the initial stage when a continuous upward torque state occurs, without using compensating ropes, tensioning wheels, etc.

[0079] The elevator monitoring program of Embodiment 3 is a program that causes a computer to execute the elevator monitoring method of Embodiment 3.

[0080] Furthermore, the recording medium of Embodiment 3 is a computer-readable recording medium that stores an elevator monitoring program that causes a computer to execute the elevator monitoring method of Embodiment 3.

[0081] In embodiments 1 to 3, the elevator monitoring device 30 may be provided outside the control panel 27 as a device independent of the elevator control device 28, as shown in Figure 9.

[0082] Furthermore, in embodiments 1 to 3, the elevator monitoring device 30 may be located in a remote control center for the elevator system.

[0083] In this case, as shown in Figure 10, the elevator monitoring device 30 can communicate with the elevator control device 28 via the communication network 40. In this case, the elevator monitoring device 30 may also be able to communicate with the elevator control devices 28 in multiple elevator systems via the communication network 40. That is, the elevator monitoring device 30 may monitor whether or not a continuous upward torque state occurs in multiple elevator systems.

[0084] Furthermore, the first lifting body may be a counterweight 17, and the second lifting body may be a cage 16.

[0085] Furthermore, the functions of the elevator control device 28 and elevator monitoring device 30 in embodiments 1 to 3 are realized by processing circuits. Figure 11 is a configuration diagram showing a first example of a processing circuit that realizes the functions of the elevator control device 28 and elevator monitoring device 30 in embodiments 1 to 3. The processing circuit 100 in the first example is dedicated hardware.

[0086] Furthermore, the processing circuit 100 may be, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof. In addition, each function of the elevator control device 28 and the elevator monitoring device 30 may be implemented by a separate processing circuit 100, or all functions may be implemented together by the processing circuit 100.

[0087] Figure 12 is a configuration diagram showing a second example of a processing circuit that implements the functions of the elevator control device 28 and elevator monitoring device 30 of Embodiments 1 to 3. The processing circuit 200 of the second example includes a processor 201 and a memory 202.

[0088] Processor 201 can include, for example, a CPU (Central Processing Unit), a GPU (Graphics Processing Unit), a microprocessor, a microcontroller, or a DSP (Digital Signal Processor).

[0089] In the processing circuit 200, the functions of the elevator control device 28 and the elevator monitoring device 30 are realized by software, firmware, or a combination of software and firmware. The software and firmware are written as programs and stored in memory 202. The processor 201 realizes each function by reading and executing the programs stored in memory 202.

[0090] The program stored in memory 202 can be said to cause the computer to execute the procedures or methods of each of the parts described above. Here, memory 202 refers to non-volatile or volatile semiconductor memory such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), and EEPROM (Electrically Erasable and Programmable Read Only Memory). Magnetic disks, flexible disks, optical disks, compact disks, minidiscs, DVDs, etc., also fall under the category of memory 202.

[0091] Furthermore, some of the functions of the above-mentioned parts may be implemented using dedicated hardware, while others may be implemented using software or firmware.

[0092] Thus, the processing circuit can realize the functions of each of the above-mentioned parts through hardware, software, firmware, or a combination thereof.

[0093] Furthermore, the overall layout of the elevator system is not limited to the layout shown in Figure 1. For example, the roping method may be a 1:1 roping method.

[0094] Furthermore, the elevator system may be a machine-room-less elevator, a double-deck elevator, a single-shaft multi-car elevator system, etc. In the single-shaft multi-car system, the upper car and the lower car located directly below the upper car move independently up and down a common hoistway. [Explanation of Symbols]

[0095] 12 Hoisting machine, 15 Suspension body, 16 Cage (first elevator), 17 Counterweight (second elevator), 26 Counterweight buffer, 30 Elevator monitoring device, 33 Status determination unit, 34 Stop command unit.

Claims

1. A state determination unit determines whether a continuous upward torque state is occurring, which is a state in which the second lifting body, which is either the basket or the counterweight, is stopped, and torque is being generated in the hoisting machine in the direction of raising the first lifting body, which is the other of the basket and the counterweight. When the state determination unit determines that the continuous rising torque state is occurring, the stop command unit generates a stop command to stop the hoisting machine. An elevator monitoring device equipped with the following features.

2. The state determination unit, The elevator monitoring device according to claim 1, which determines that the upward torque continuation state is occurring when the first elevator is rising despite the second elevator being stopped, based on first position information which is information regarding the position of the first elevator and second position information which is information regarding the position of the second elevator.

3. The state determination unit, The elevator monitoring device according to claim 1, which determines that the continuous upward torque state is occurring when the tension value of the portion of the suspension system that suspends the first and second elevator bodies on the side of the second elevator body that is closer to the hoisting machine falls below a tension set value.

4. The elevator monitoring device according to claim 3, wherein the tension setting value is set to a value smaller than the lower limit of the fluctuation of the tension value during normal travel of the first elevator body, and larger than the tension value due to the self-weight of the suspension body when the second elevator body is in contact with a buffer installed at the bottom of the elevator shaft.

5. The first lifting body is the cage, The state determination unit, The following information is obtained: load rate information, which is information regarding the load rate of the basket, and torque information, which is information regarding the torque output by the hoisting machine. The elevator monitoring device according to claim 1, which determines that the continuous upward torque state is occurring when the torque value output by the hoisting machine becomes equal to or greater than a torque setting value set based on the load factor.

6. Elevator monitoring device according to any one of claims 1 to 5 An elevator system equipped with the following features.

7. A state determination step to determine whether a continuous upward torque state is occurring, in which the second lifting body, which is either the basket or the counterweight, is stopped, and torque is being generated in the hoisting machine in the direction of raising the first lifting body, which is the other of the basket and the counterweight; If the state determination step determines that the rising torque is continuing, a stop command step is performed to generate a stop command to stop the hoisting machine. An elevator monitoring method that includes this.

8. An elevator monitoring program that causes a computer to execute the elevator monitoring method described in claim 7.

9. A computer-readable recording medium that stores an elevator monitoring program that causes a computer to execute the elevator monitoring method described in claim 7.

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