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

Abstract

To provide an elevator monitoring device capable of preventing the car or a counterweight from continuing to rise at an earlier stage despite the descent of the other being prevented. [Solution] A state determination unit 33 determines that a continuing ascending torque state is occurring when the car 16 is rising even though the counterweight 17 is stopped. The continuing ascending torque state is a state in which the counterweight 17 is stopped and torque in a direction that raises the car 16 is occurring in the hoist 12. When the state determination unit 33 determines that a continuing ascending torque state is occurring, a stop command unit 34 issues a stop command to stop the hoist 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 technology]

[0002] In conventional elevator systems, a connecting rope is connected between the car and the counterweight. The connecting rope is wound around a tension pulley. When the lifting distance of the car differs from the lifting distance of the counterweight, the tension pulley is pulled by the connecting rope and displaced. When the displacement of the tension pulley reaches a set amount, the detector 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] International Publication No. 2006 / 022015 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional elevator systems like the one described above, the hoist is stopped when the displacement of the tension sheave reaches a set amount. Therefore, if, for example, the counterweight is prevented from descending and an overwinding occurs, the hoist is stopped only after the counterweight stops and the car rises to a certain extent. This could result in the car exceeding the allowable lift range.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide an elevator monitoring device, elevator apparatus, elevator monitoring method, elevator monitoring program, and recording medium that can prevent either the car or the counterweight from continuing to rise even though the other is prevented from descending at an earlier stage. [Means for solving the problem]

[0006] The elevator monitoring device according to the present disclosure includes a state determination unit that determines whether a continuous ascending torque state is occurring, in which the second ascending body, which is either the car or the counterweight, is stopped and a torque in a direction that raises the first ascending body, which is the other of the car and the counterweight, is generated in the hoist, and a stop command unit that issues a stop command to stop the hoist when the state determination unit determines that a continuous ascending torque state is occurring. The elevator monitoring method according to the present disclosure includes a state determination step of determining whether a continuous ascending torque state is occurring, in which the second ascending body, which is either the car or the counterweight, is stopped and a torque in a direction that raises the first ascending body, which is the other of the car and the counterweight, is generated in the hoist, and a stop command step of issuing a stop command to stop the hoist when it is determined in the state determination step that a continuous ascending torque state is occurring. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to prevent the car or the counterweight from continuing to rise even though the descent of the other one is prevented, at an earlier stage. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a schematic configuration diagram showing an elevator device according to a first embodiment. [Figure 2] FIG. 2 is a block diagram showing the control panel of FIG. 1. [Figure 3]2 is a diagram showing a state in which the car of FIG. 1 rises and the counterweight hits the counterweight buffer. FIG. [Figure 4] FIG. 4 is a configuration diagram showing a state in which overwinding occurs in the elevator device of FIG. 3. [Figure 5] FIG. 3 is a block diagram showing the functions of the elevator monitoring device of FIG. 2. [Figure 6] 6 is a flowchart showing an overwinding suppression process performed by the elevator monitoring device of FIG. 5. [Figure 7] FIG. 10 is a block diagram showing the functions of an elevator monitoring device according to a second embodiment. [Figure 8] FIG. 10 is a block diagram showing the functions of an elevator monitoring device according to a third embodiment. [Figure 9] FIG. 10 is a block diagram showing a first modified example of the first to third embodiments. [Figure 10] FIG. 10 is a block diagram showing a second modified example of the first to third embodiments. [Figure 11] 1 is a configuration diagram showing a first example of a processing circuit that realizes each function of the elevator control device and elevator monitoring device according to the first to third embodiments. [Figure 12] FIG. 4 is a configuration diagram showing a second example of a processing circuit that realizes each function of the elevator control device and elevator monitoring device according to the first to third embodiments. DETAILED DESCRIPTION OF THE INVENTION

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

[0010] A hoisting machine 12 is installed at the top of the elevator shaft 11. The hoisting machine 12 has a hoisting machine main body 13 and a drive 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 drive sheave 14. The hoisting machine brake keeps the drive sheave 14 stationary. The hoisting machine brake also brakes the rotation of the drive sheave 14.

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

[0012] Cage 16 is suspended within hoistway 11 by suspension body 15. Counterweight 17 is suspended within hoistway 11 by suspension body 15 on the opposite side of drive sheave 14 from car 16. The first lifting body in embodiment 1 is car 16. The second lifting body in embodiment 1 is counterweight 17.

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

[0014] A first car hoisting sheave 18a and a second car hoisting sheave 18b, which is a movable pulley, are provided below the car 16. A counterweight hoisting sheave 19 is provided above the counterweight 17.

[0015] A first cleat part 21 and a second cleat part 22 are provided at the top of the elevator shaft 11. The first end part 15a is connected to the first cleat part 21. The second end part 15b is connected to the second cleat part 22.

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

[0017] A first tension measuring device 23 is provided at the first cleat section 21. The first tension measuring device 23 outputs a signal corresponding to the tension acting on the portion of the suspension body 15 closer to the car 16 than the hoisting machine 12.

[0018] A second tension measuring device 24 is provided on the second cleat portion 22. The second tension measuring device 24 outputs a signal corresponding to the tension acting on the portion of the suspended body 15 closer to the counterweight 17 than the hoisting machine 12.

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

[0020] For example, displacement sensors can be used as the first tension measuring device 23 and the second tension measuring device 24. The displacement sensors detect the displacement of the ends of the corresponding shackle springs. 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] The first tension measuring device 23 and the second tension measuring device 24 are not limited to displacement sensors, but may be 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 elevator shaft 11.

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

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

[0026] 3 is a configuration diagram showing a state in which the car 16 in FIG. 1 rises and the counterweight 17 hits the counterweight buffer 26. In this state, if the output torque of the hoisting machine 12 in the direction of raising the car 16 is small, the rotation of the drive sheave 14 stops.

[0027] 3, when the output torque of the hoisting machine 12 increases in the direction of lifting the car 16, the tension of the suspension body 15 on the counterweight 17 side relative to the drive sheave 14 decreases. After this, when the output torque increases further, the drive sheave 14 either spins freely relative to the suspension body 15, or the drive sheave 14 does not spin freely and the car 16 rises further.

[0028] In particular, when the lifting stroke is long and the weight of the suspended body 15 is large, the traction force acting between the drive sheave 14 and the suspended body 15 is large, and even though the counterweight 17 is stopped, the car 16 may rise, resulting in a so-called overwinding state.

[0029] Figure 4 is a configuration diagram showing a state in which overwinding has occurred in the elevator system of Figure 3. In this state, the car 16 has risen by Δh from the state in Figure 3, and slack has occurred in the portion of the suspension body 15 closer to the counterweight 17 than the drive sheave 14.

[0030] If such an overwinding state occurs, there is a risk that the car 16 will rise beyond the allowable lifting range. An overwinding state may also occur if the counterweight 17 hits an obstacle in the hoistway 11.

[0031] In contrast to this, the elevator monitoring device 30 of the first embodiment prevents the car 16 from continuing to rise despite the fact that the counterweight 17 is prevented from descending.

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

[0033] The position information acquisition unit 31 acquires first position information and second position information. The first position information is information about the vertical position of the car 16 in the hoistway 11. The second position information is information about the vertical position of the counterweight 17 in the hoistway 11.

[0034] Although not shown in Fig. 1, the elevator system is provided 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 position information acquisition unit 31 acquires first position information from a first position detection device 35. The position information acquisition unit 31 also acquires second position information from a second position detection device 36.

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

[0037] The storage 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 that a continuing ascending torque state is occurring when the car 16 is ascending despite the counterweight 17 being stopped, based on the first position information and the second position information. The continuing ascending torque state is a state in which the counterweight 17 is stopped and torque in a direction that causes the car 16 to ascend is occurring in the hoist 12.

[0039] When the state determination unit 33 determines that the ascending torque continuation state is occurring, the stop command unit 34 issues a stop command to stop the hoist 12. When the stop command unit 34 issues a stop command, the power supply to the hoist motor and the hoist brake is forcibly cut off.

[0040] Fig. 6 is a flowchart showing the overwinding prevention process by the elevator monitoring device 30 of Fig. 5. When the overwinding prevention process is started, the elevator monitoring device 30 acquires first position information and second position information in step S101. Next, the elevator monitoring device 30 determines whether or not an ascending torque continuation state is occurring in step S102.

[0041] If the ascending torque continuation state has not occurred, the processing by the elevator monitoring device 30 returns to the processing of step S101.

[0042] If the ascending torque continuation state occurs, the elevator monitoring device 30 issues a stop command and ends the overwinding suppression process.

[0043] The elevator monitoring method of the first embodiment includes a state determination step and a stop command step.

[0044] The state determination step is a step for determining whether or not a continuous ascending torque state is occurring. The stop command step is a step for issuing a stop command to stop the hoisting machine 12 when it is determined in the state determination step that a continuous ascending torque state is occurring.

[0045] The elevator monitoring method of the first embodiment also includes a position information acquiring step, which is a step of acquiring first position information and second position information.

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

[0047] In such an elevator monitoring device 30, elevator device, and elevator monitoring method, it is determined whether or not a continuous ascending torque state is occurring, and if it is determined that a continuous ascending torque state is occurring, a stop command is generated.

[0048] Therefore, the car 16 can be prevented from continuing to rise even though the counterweight 17 is prevented from descending, at an earlier stage.

[0049] Furthermore, in the first embodiment, it is detected that the car 16 is rising even though the counterweight 17 is stopped, based on the first position information and the second position information. Therefore, with a simple configuration that does not use a compensating rope, a tensioner, or the like, it is possible to quickly stop the hoisting machine 12 at an early stage when a state of continuous rising torque occurs.

[0050] The elevator monitoring program of the first embodiment is a program that causes a computer to execute the elevator monitoring method of the first embodiment.

[0051] Moreover, the recording medium of the first embodiment is a computer-readable recording medium on which an elevator monitoring program that causes a computer to execute the elevator monitoring method of the first embodiment is recorded.

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

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

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

[0055] Based on the tension information acquired by the tension information acquisition unit 37, the state determination unit 33 determines that a continuous rising torque state is occurring when the tension value of the part of the suspension body 15 closer to the counterweight 17 than the hoisting machine 12 becomes less than the tension setting value.

[0056] The tension setting value is set to a value smaller than the lower limit of the fluctuation of the tension value when the car 16 is running normally, and larger than the tension value due to the weight of the suspended body 15 when the counterweight 17 hits the counterweight buffer 26.

[0057] Fluctuations in the tension value during normal running of the car 16 occur due to acceleration / deceleration of the car 16, drive loss, etc. The tension value due to the weight of the suspension body 15 reaches its maximum when the counterweight buffer 26 is pushed down by the counterweight 17.

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

[0059] The elevator monitoring method of the second embodiment has a tension information acquisition step. The tension information acquisition step is a step of acquiring the above-mentioned tension information.

[0060] Furthermore, in the state determination step of embodiment 2, if the tension value of the portion of the suspension body 15 closer to the counterweight 17 than the hoisting machine 12 becomes equal to or less than the tension setting value based on the tension information, it is determined that a continuous rising torque state is occurring.

[0061] Other configurations and processes in the second embodiment are the same as those in the first embodiment.

[0062] In such an elevator monitoring device 30, elevator device, and elevator monitoring method, when the tension value included in the tension information becomes equal to or less than the tension setting value, it is determined that an ascending torque continuation state is occurring.

[0063] Therefore, with a simple configuration, the hoisting machine 12 can be stopped before an over-hoisting state actually occurs. Therefore, it is possible to more reliably prevent the car 16 from continuing to rise despite the counterweight 17 being prevented from descending.

[0064] The elevator monitoring program of the second embodiment is a program that causes a computer to execute the elevator monitoring method of the second embodiment.

[0065] Moreover, the recording medium of the second embodiment is a computer-readable recording medium on which an elevator monitoring program that causes a computer to execute the elevator monitoring method of the second embodiment is recorded.

[0066] Embodiment 3 Next, Fig. 8 is a block diagram showing the functions of an elevator monitoring device 30 according to embodiment 3. The elevator monitoring device 30 of embodiment 3 has a control information acquiring unit 38 instead of the position information acquiring 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 factor information and torque information. The load factor information is information related to the load factor of the car 16. The torque information is information related to the magnitude of the torque output by the hoisting machine 12.

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

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

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

[0071] The torque set value is set to a torque value that makes the tension of the portion of the suspension body 15 on the counterweight 17 side the tension set value shown in embodiment 2. Since the output torque of the hoisting machine 12 also changes depending on the loading rate of the car 16, the torque set value is updated every time the loading rate changes.

[0072] The torque setting value is calculated from the weight of the car 16 and the weight of the equipment on the counterweight 17 side other than the suspended body 15. That is, the torque setting value is calculated from the specification data for each elevator and the loading rate of the car 16.

[0073] The elevator monitoring method of the third embodiment has a control information acquisition step. The control information acquisition step is a step of acquiring the above-mentioned control information.

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

[0075] Other configurations and processes in the third embodiment are the same as those in the first embodiment.

[0076] In the elevator monitoring device 30, elevator device, and elevator monitoring method, it is determined that a continuous ascending torque state is occurring when the torque value output by the hoisting machine 12 is equal to or greater than a torque set value. The torque set value is set based on the load factor of the car 16.

[0077] Therefore, with a simple configuration, the hoisting machine 12 can be stopped before an over-hoisting state actually occurs. Therefore, it is possible to more reliably prevent the car 16 from continuing to rise despite the counterweight 17 being prevented from descending.

[0078] Furthermore, in a typical traction-type elevator system, the data on the load factor of the car 16 and the data on the output torque of the hoist 12 are data acquired by the elevator control device 28. Therefore, according to the third embodiment, it is possible to stop the hoist 12 at an early stage when a continuous ascending torque state occurs, without using a compensating rope, a tensioning sheave, or the like.

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

[0080] Moreover, the recording medium of the third embodiment is a computer-readable recording medium on which an elevator monitoring program that causes a computer to execute the elevator monitoring method of the third embodiment is recorded.

[0081] In the first to third embodiments, the elevator monitoring device 30 may be provided outside the control panel 27 as a device independent from the elevator control device 28, as shown in FIG.

[0082] In addition, in the first to third embodiments, the elevator monitoring device 30 may be provided in a remote control center of the elevator device.

[0083] In this case, as shown in Fig. 10, the elevator monitoring device 30 is capable of communicating with the elevator control device 28 via a communication network 40. In this case, the elevator monitoring device 30 may be capable of communicating with the elevator control devices 28 in a plurality of elevator devices via the communication network 40. That is, the elevator monitoring device 30 may monitor whether or not a continuous upward torque state has occurred in a plurality of elevator devices.

[0084] The first lifting body may be a counterweight 17 and the second lifting body may be a car 16.

[0085] Furthermore, each function of the elevator control device 28 and the elevator monitoring device 30 according to the first to third embodiments is realized by a processing circuit. Fig. 11 is a configuration diagram showing a first example of a processing circuit that realizes each function of the elevator control device 28 and the elevator monitoring device 30 according to the first to third embodiments. The processing circuit 100 of the first example is dedicated hardware.

[0086] 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. Each function of the elevator control device 28 and the elevator monitoring device 30 may be realized by a separate processing circuit 100, or all functions may be realized by the processing circuit 100.

[0087] 12 is a configuration diagram showing a second example of a processing circuit that realizes each function of the elevator control device 28 and the elevator monitoring device 30 according to the first to third embodiments. The processing circuit 200 of the second example includes a processor 201 and a memory 202.

[0088] The processor 201 may be, for example, a central processing unit (CPU), a graphics processing unit (GPU), a microprocessor, a microcontroller, or a digital signal processor (DSP).

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

[0090] It can also be said that the programs stored in memory 202 cause the computer to execute the procedures or methods of the above-mentioned sections. 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, minidisks, DVDs, and the like also fall under memory 202.

[0091] It should be noted that some of the functions of the above-described units may be realized by dedicated hardware, and other parts may be realized by software or firmware.

[0092] In this way, the processing circuit can realize the functions of each of the above-mentioned units by hardware, software, firmware, or a combination of these.

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

[0094] The elevator system may also be a machine room-less elevator, a double-deck elevator, a one-shaft multi-car elevator system, etc. The one-shaft multi-car system is a system in which an upper car and a lower car located directly below the upper car independently ascend and descend in a common elevator shaft. [Explanation of symbols]

[0095] 12 hoisting machine, 15 suspension body, 16 car (first lifting body), 17 counterweight (second lifting body), 26 counterweight buffer, 30 elevator monitoring device, 33 status determination unit, 34 stop command unit.

Claims

1. a state determination unit that determines whether a continuing state of ascending torque is occurring, in which a second ascending body, which is either the car or the counterweight, is stopped and a torque in a direction that raises the first ascending body, which is the other of the car and the counterweight, is generated in the hoist; a stop command unit that issues a stop command to stop the hoist when it is determined by the state determination unit that the ascending torque continuation state is occurring; Equipped with The state determination unit An elevator monitoring device that determines that the ascending torque continuation state is occurring when the first ascending body is ascending even though the second ascending body is stopped, based on first position information, which is information regarding the position of the first ascending body, and second position information, which is information regarding the position of the second ascending body.

2. a state determination unit that determines whether a continuing state of ascending torque is occurring, in which a second ascending body, which is either the car or the counterweight, is stopped and a torque in a direction that raises the first ascending body, which is the other of the car and the counterweight, is generated in the hoist; a stop command unit that issues a stop command to stop the hoist when it is determined by the state determination unit that the ascending torque continuation state is occurring; Equipped with The state determination unit An elevator monitoring device that determines that the ascending torque continuation state is occurring when the tension value of the portion of the suspension body that suspends the first and second lifting bodies that is closer to the second lifting body than the hoist becomes equal to or less than a tension setting value.

3. 3. The elevator monitoring device according to claim 2, wherein the tension setting value is set to a value that is smaller than a lower limit value of the fluctuation of the tension value during normal running of the first ascending / descending body, and is greater than a tension value due to the weight of the suspended body when the second ascending / descending body hits a buffer installed at the bottom of the elevator shaft.

4. The elevator monitoring device according to any one of claims 1 to 3. An elevator device comprising:

5. a state determination step of determining whether or not a lifting torque continuation state is occurring, in which the second lifting body, which is either the car or the counterweight, is stopped and a torque in a direction that lifts the first lifting body, which is the other of the car and the counterweight, is generated in the hoist; a stop command step of issuing a stop command to stop the hoist when it is determined in the state determination step that the ascending torque continuation state is occurring; It contains In the state determination step, an elevator monitoring method determines that the ascending torque continuation state is occurring when the first ascending body is ascending even though the second ascending body is stopped, based on first position information which is information regarding the position of the first ascending body and second position information which is information regarding the position of the second ascending body.

6. a state determination step of determining whether or not a lifting torque continuation state is occurring, in which the second lifting body, which is either the car or the counterweight, is stopped and a torque in a direction that lifts the first lifting body, which is the other of the car and the counterweight, is generated in the hoist; a stop command step of issuing a stop command to stop the hoist when it is determined in the state determination step that the ascending torque continuation state is occurring; It contains In the state determination step, an elevator monitoring method is provided in which it is determined that the ascending torque continuation state is occurring when the tension value of the portion of the suspension body suspending the first and second lifting bodies that is closer to the second lifting body than the hoist becomes equal to or less than a tension setting value.

7. An elevator monitoring program that causes a computer to execute the elevator monitoring method according to claim 5 or 6.

8. A computer-readable recording medium having recorded thereon an elevator monitoring program that causes a computer to execute the elevator monitoring method according to claim 5 or 6.

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