Elevator Systems

Abstract

To provide an elevator system capable of operating an elevator safely while ensuring reliability even if a pit in a hoistway is flooded. [Solution] The elevator system comprises a flood sensor that detects a flooded state in a pit below the elevator shaft, a first detection device that is positioned above the pit and detects a first signal corresponding to the amount of rotation of the motor of the hoist that raises and lowers the car, a second detection device that detects a second signal synchronized with the up and down movement of the car, an abnormality detection device that is positioned at least partially below the height of the flooded state in the pit and detects abnormalities in the second detection device, and a control device that uses the second signal to control the movement of the car if the flood sensor does not detect a flooded state, and uses the first signal to control the movement of the car if the flood sensor detects a flooded state.

Description

[Technical field]

[0001] The present disclosure relates to an elevator system suitable for safety management during flooding. [Background technology]

[0002] Patent Document 1 discloses a technology related to an elevator that can continue to operate its car even when flooded. The elevator of this technology is equipped with a flooded side electrical system installed below the maximum flood height and a non-flooded side electrical system installed above it. When the pit is flooded, the flooded side electrical system is disconnected from the car control means, and the non-flooded side electrical system is connected to the car control means to continue operation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2022-112851 A Summary of the Invention [Problem to be solved by the invention]

[0004] There is known an elevator in which a position detector that detects the position and speed of the car is installed in the elevator shaft. If an abnormality occurs in the position detector, the function of detecting the position and speed of the car may be lost. For this reason, an abnormality detector for the position detector is sometimes installed in a pit under the elevator shaft.

[0005] Here, if the pit is flooded, there is a risk that the anomaly detection device will be flooded. Therefore, as with the technology in Patent Document 1, when the pit is flooded, it is possible to operate the car by disconnecting the anomaly detection device from the car control means as a flooded side electrical system. However, if the anomaly detection device malfunctions, the reliability of the detection value from the position detection device cannot be guaranteed, and this leaves issues with the safety of elevator operation.

[0006] The present disclosure has been made to solve the problems described above, and aims to provide an elevator system that can operate the elevator safely while ensuring reliability, even if the elevator shaft pit is flooded. [Means for solving the problem]

[0007] The elevator system of the present disclosure comprises a flood sensor that detects a flooded state in a pit at the bottom of the elevator shaft, a first detection device that is arranged above the pit and detects a first signal corresponding to the amount of rotation of the motor of the hoist that raises and lowers the car, a second detection device that detects a second signal synchronized with the up and down movement of the car, an abnormality detection device that is arranged at least partially below the height of the flooded state in the pit and detects abnormalities in the second detection device, and a control device that uses the second signal to control the movement of the car if the flood sensor does not detect a flooded state, and uses the first signal to control the movement of the car if the flood sensor detects a flooded state. Effect of the Invention

[0008] According to the technology disclosed herein, even if the elevator shaft pit is flooded, it is possible to operate the elevator safely while ensuring reliability. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic configuration diagram of an elevator system according to a first embodiment. [Diagram 2] 2 is a diagram for explaining functional blocks provided in the traffic management unit. FIG. [Diagram 3] FIG. 2 is an activity diagram of processing performed by an operation control unit of the elevator system in the first embodiment. [Figure 4] 11 is an activity diagram of a submergence detection process performed by a submergence detection processor. FIG. [Diagram 5] FIG. 4 is an activity diagram of the safety circuit processing performed by the safety circuit processing unit. [Figure 6]FIG. 11 is an activity diagram of the car movement processing performed by the car movement control processing unit. [Figure 7] FIG. 3 is a diagram showing a specific example of an operation executed in the elevator system in the first embodiment. [Figure 8] FIG. 13 is a diagram illustrating a modification of the hardware resources of the control device. [Figure 9] FIG. 13 is a diagram illustrating another modified example of the hardware resources of the control device. [Figure 10] FIG. 11 is a schematic configuration diagram of an elevator system according to a second embodiment. [Figure 11] FIG. 11 is a schematic configuration diagram of an elevator system according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment will be described with reference to the drawings. In addition, elements common to the various drawings are given the same reference numerals, and duplicated explanations will be omitted.

[0011] 1. Embodiment 1 1-1. Schematic configuration of elevator system according to embodiment 1 Fig. 1 is a schematic configuration diagram of an elevator system according to a first embodiment. An elevator of an elevator system 100 according to the first embodiment is installed in a facility such as a building having multiple floors. An elevator hoistway 2 is provided in the facility. The hoistway 2 is a space that is long in the vertical direction and spans the multiple floors.

[0012] The elevator's main components include a hoist 3, a main rope 4, a counterweight 5, a control device 10, a car 6, a position detection device 20, a flood sensor 42, a tension switch 44, and a disconnect switch 46.

[0013] The car 6 is a device that transports passengers and the like inside the car between multiple floors by traveling in the vertical direction, which is the direction of movement, in the elevator shaft 2.

[0014] The counterweight 5 moves up and down the hoistway 2. The car 6 and the counterweight 5 are suspended in the hoistway 2 by the main ropes 4.

[0015] The hoist 3 is installed at the top of the elevator shaft 2. The hoist 3 includes a sheave 32 around which the main rope 4 is wound, a motor 34 that rotates the sheave 32, and a motor encoder 36 that detects the amount of rotation, which is the amount of angle by which the motor 34 rotates. The motor encoder 36 is also called the "first detection device." When the sheave 32 is rotated by the motor 34, the main rope 4 moves in a direction corresponding to the direction in which the sheave 32 rotates in synchronization with the sheave 32. The car 6 rises or falls in synchronization with the direction in which the main rope 4 moves. The motor encoder 36 outputs a motor encoder signal corresponding to the amount of rotation of the motor 34. The motor encoder signal is also called the "first signal." Since the amount of rotation of the motor 34 is an amount that is correlated with the position and speed of the car 6, the motor encoder signal can also be used to detect the position and speed of the car 6.

[0016] The position detection device 20 is a device that outputs a signal synchronized with the upward and downward movement of the car 6. The position detection device 20 is also called a "second detection device." The position detection device 20 is provided from the upper part to the lower part of the hoistway 2. The position detection device 20 includes a governor rope 22, a governor sheave 24, and a governor encoder 26. The governor sheave 24 is provided, for example, in a machine room at the upper part of the hoistway 2. The governor rope 22 is configured in an endless manner and is wound around the governor sheave 24. A part of the governor rope 22 is connected to the car 6. The governor encoder 26 detects the amount of rotation, which is the amount of angle through which the governor sheave 24 rotates. The amount of rotation of the governor sheave 24 is an amount that is correlated with the position and speed of the car 6. The position detection device 20 outputs a governor encoder signal according to the amount of rotation of the governor sheave 24. This signal is also called the "second signal."

[0017] The flood sensor 42 is a sensor that detects a flooded state in the pit 2a at the bottom of the elevator shaft 2. The flood height of the "flooded state" here is a flood height at which the pit equipment power supply 8b in the elevator pit 2a should be shut off. The flood sensor 42 outputs flood sensor information including whether or not a flooded state in the pit 2a has been detected.

[0018] The tension switch 44 is an abnormality detection device for detecting a break or detachment of the governor rope 22. The tension switch 44 is installed in the pit 2a below the flood height when at least a part of the pit 2a is flooded, and detects that the tension of the governor rope 22 deviates from the appropriate range. The tension switch 44 operates by receiving power from the pit equipment power source 8b. Typically, the tension switch 44 outputs a tension switch signal in a normal state in which the tension of the governor rope 22 is within the appropriate range, and in an abnormal state in which the tension of the governor rope 22 deviates from the appropriate range, the contact is disconnected and the output of the tension switch signal is stopped. In other words, the tension switch state in which the tension switch 44 outputs the tension switch signal indicates a "normal" state, and the tension switch state in which the tension switch 44 does not output the tension switch signal indicates an "abnormal" state. In addition, the tension switch state in which the power supply from the pit equipment power source 8b to the tension switch 44 is cut off indicates an "abnormal" state because the tension switch signal is not being output.

[0019] The disconnect switch 46 is a power supply cutoff device that receives a disconnect command from the traffic control unit 12 described later and cuts off the power supply from the pit equipment power supply 8b to the tension switch 44. The disconnect command is an operation command for an operation to be performed in response to detection of a flooded state in the pit 2a.

[0020] The control device 10 corresponds to a control panel that controls the operation of the elevator. The control device 10 includes an operation management unit 12 that mainly manages the operation of the elevator, and a drive unit 14 that mainly controls the drive of the elevator.

[0021] The drive unit 14 is a unit having a function of controlling the drive and braking of the hoisting machine 3. Drive commands and safety commands are input to the drive unit 14 from the operation management unit 12. Power is supplied to the drive unit 14 from a power source 8a. The power source 8a is electrically connected to an external commercial power source. A motor encoder signal is input to the drive unit 14 from a motor encoder 36. The drive unit 14 controls the power supplied to the motor 34 of the hoisting machine 3 by an inverter so that the amount of rotation of the motor 34 calculated from the motor encoder signal becomes a target value calculated from the drive command.

[0022] The operation control unit 12 is a unit having a function of managing the safety of elevator operation. Fig. 2 is a diagram for explaining the functional blocks of the operation control unit. The operation control unit 12 has an operation control processing unit 121, a flood detection processing unit 122, a safety circuit processing unit 123, a car position / speed detection processing unit 124, and a car movement processing unit 125 as functional blocks for executing processing to realize various functions. Below, specific processing performed in the operation control unit 12 will be explained using an activity diagram.

[0023] 1-2. Specific processing performed by the traffic control unit 3 is an activity diagram of a process performed by the operation control unit of the elevator system in the first embodiment. In the activity diagram, arrows drawn with dashed lines indicate a flow in which control is performed. In the activity diagram, arrows drawn with solid lines indicate a flow in which data is exchanged.

[0024] 3, the traffic management unit 12 starts processing when the power is turned on. The traffic management unit 12 performs processing S10, processing S20, processing S30, processing S40, and processing S50 in parallel.

[0025] 1-2-1. Process S10: Flood detection process In process S10 shown in Fig. 3, the submergence detection processing unit 122 performs submergence detection processing. Fig. 4 is an activity diagram of the submergence detection processing performed by the submergence detection processing unit. In the activity diagram, arrows drawn with dashed lines indicate flows in which control is performed. In the activity diagram, arrows drawn with solid lines indicate flows in which data is exchanged. The flow shown in Fig. 4 is repeatedly executed at a predetermined control period.

[0026] In process S100, it is determined whether the flood sensor information input from the flood sensor 42 includes information that "flooding is detected". If the flood sensor status information includes information that "flooding is detected", the process proceeds to the next process S102. On the other hand, if the flood sensor status information includes information that "flooding is not detected", the process of this routine is terminated. In process S102, a disconnect command is generated and output to the disconnect switch 46. The disconnect command is also sent to each of the safety circuit processing unit 123 and the car movement processing unit 125. In addition, the disconnect switch 46 that has received the disconnect command cuts off the power supply from the pit equipment power supply 8b to the tension switch 44. This disables the function of the tension switch 44, preventing damage such as electric leakage due to flooding.

[0027] 1-2-2. Process S20: Traffic management process In process S20 shown in Fig. 3, the traffic management processing unit 121 performs traffic management processing. Here, the traffic management processing unit 121 generates a car running command for running the car 6 based on the call registration input by the user, and sends it to the car movement processing unit 125. In addition, in the traffic management processing, the traffic management processing unit 121 blocks the transmission of the car running command when a safety command is input.

[0028] 1-2-3. Process S30: Safety circuit processing In process S30 shown in Fig. 3, the safety circuit processing unit 123 performs safety circuit processing. Fig. 5 is an activity diagram of the safety circuit processing performed by the safety circuit processing unit. In the activity diagram, arrows drawn with dashed lines indicate flows in which control is performed. In the activity diagram, arrows drawn with solid lines indicate flows in which data is exchanged. The flow shown in Fig. 5 is repeatedly executed at a predetermined control period.

[0029] In step S300, it is determined whether a disconnection command has been input. If it is determined that a disconnection command has not been input, the process proceeds to step S302.

[0030] The series of processes from process S302 to process S304 is called "safety management process." In process S302, the tension switch state is determined. If the tension switch state is determined to be "normal," process S304 is skipped and this routine is terminated. On the other hand, if the tension switch state is determined to be "abnormal" in process S302, the process proceeds to process S304.

[0031] In process S304, a safety command indicating that the elevator is "unable to run" is generated and output to the drive unit 14. The generated safety command is also sent to the operation management processing unit 121 of the operation management unit 12. When process S304 is completed, the processing of this routine ends. Upon receiving the safety command, the drive unit 14 performs braking control to stop the car 6. This prevents the elevator from running when there is an abnormality in the position detection device 20.

[0032] On the other hand, if it is determined in step S300 that a "disconnect command has been issued," the safety management processes of steps S302 and S304 are skipped and not executed. This process is called "mask process." After the mask process, the process of this routine is terminated.

[0033] 1-2-4. Process S40: Cage position and speed detection process In process S40, the car position / speed detection processing unit 124 calculates the position and speed of the car 6 based on the governor encoder signal of the position detection device 20. Information including the calculated position and speed of the car 6 is hereinafter referred to as "car position / speed information."

[0034] 1-2-5. Process S50: Cage movement process In process S50, the car movement processing unit 125 performs car movement processing to calculate and output a drive command based on the speed and position of the car 6. FIG. 6 is an activity diagram of the car movement processing performed by the car movement control processing unit. In the activity diagram, arrows drawn with dashed lines indicate flows in which control is performed. In the activity diagram, arrows drawn with solid lines indicate flows in which data is exchanged. The flow shown in FIG. 6 is repeatedly executed at a predetermined control period.

[0035] In step S500, it is determined whether or not a car travel command has been input. If the result is that a car travel command has not been input, the processing of this routine is terminated. On the other hand, if a car travel command has been input in step S500, the processing proceeds to step S502.

[0036] In process S502, it is determined whether a disconnection command has been input. If it is determined that a "disconnection command has not been input," it is determined that the position detection device 20 is normal, and the process proceeds to process S504. In process S504, calculations for movement control of the car 6 are performed based on the governor encoder signal of the position detection device 20. Here, car position / speed information calculated based on the governor encoder signal in the car position / speed detection process is input. Then, in the movement control, a drive command is calculated using the position and speed of the car 6 included in the car position / speed information, and the calculated drive command is output to the drive unit 14.

[0037] On the other hand, if it is determined in step S502 that a "disconnect command is present", it is determined that the position detection device 20 is abnormal, and the process proceeds to step S506. In step S506, a calculation is performed for the movement control of the car 6 based on the motor encoder signal. Here, in the movement control, the position and speed of the car 6 are calculated based on the motor encoder signal, a drive command is calculated using the calculated position and speed, and the calculated drive command is output to the drive unit 14.

[0038] 1-3. Operation example of elevator system in embodiment 1 Next, a specific example of an operation performed in the elevator system will be described with reference to Fig. 7. Fig. 7 is a diagram showing a specific example of an operation performed in the elevator system in the first embodiment. Fig. 7 shows, by a time chart, the time changes of signals and commands inputted / outputted to / from the operation management unit of the control device 10 of the elevator system 100.

[0039] 1-3-1. Operation at time t0 Since flood sensor information of "no flooding detected" is input from flood sensor 42, a disconnect command is not input. Therefore, the governor encoder signal is used to control the car movement, and the motor encoder signal is not used. Also, at time t0, the tension switch state is "normal", and a safety command indicating "not allowed to run" is not generated. Therefore, the elevator receives a drive command to "run" and starts running.

[0040] 1-3-2. Operation at time t1 When the input of the tension switch signal from the tension switch 44 is stopped, the tension switch state becomes "abnormal" and a safety command indicating "no travel" is generated. The elevator receives the "no travel" safety command and abruptly stops travel.

[0041] 1-3-3. Operation at time t2 When a tension switch signal is input again from the tension switch 44, the tension switch state is determined to be "normal" and a safety command indicating "no travel" is not generated. Therefore, the car travel command is not cut off due to the input of a safety command, but the car travel command has not been generated due to reasons such as no call registration being input, so the elevator continues to be stopped.

[0042] 1-3-4. Operation at time t3 When flood sensor information indicating "flooding detected" is input from flood sensor 42, a disconnect command is input. As a result, the motor encoder signal is used for car movement control, and the governor encoder signal is not used. Furthermore, upon receiving the disconnect command, disconnect switch 46 cuts off the power supply from the pit equipment power supply 8b to tension switch 44. As a result, the input of the tension switch signal from tension switch 44 is stopped, and the tension switch state becomes "abnormal". However, when a disconnect command is input, safety management processing is skipped, so a safety command indicating "running not possible" is not generated. For this reason, the car running command is not cut off due to the input of a safety command, but the elevator remains stopped because the car running command has not been generated due to reasons such as no call registration being input.

[0043] 1-3-5. Operation at time t4 When a car travel command is generated due to a call registration being input or other reasons while a safety command is not being input, a "travel" drive command is generated. When a "travel" drive command is received, the elevator executes car movement control and starts traveling. Note that the motor encoder signal is used for car movement control, and the governor encoder signal is not used.

[0044] 1-3-6. Operation at time t5 When a "stop" drive command is received without a safety command being input, the elevator executes car movement control to stop the elevator from moving. Note that the motor encoder signal is used for car movement control, and the governor encoder signal is not used.

[0045] 1-4. Actions and Effects According to the operation of the elevator system 100 as described above, the following actions and effects can be obtained.

[0046] In a flooded state, there is a risk that an abnormality will occur in the tension switch 44. If an abnormality occurs in the tension switch 44, an abnormality in the position detection device 20 cannot be detected, and therefore the speed and position of the car 6 detected by the position detection device 20 cannot be guaranteed to be reliable. According to the elevator system of embodiment 1, when a flooded state is detected, the governor encoder signal is switched to the motor encoder signal and car movement control is executed. This makes it possible to continue operating the elevator based on the car travel command while guaranteeing reliability, even in a state in which an abnormality in the position detection device 20 cannot be detected.

[0047] In a flooded state, the disconnect switch 46 cuts off the power supply to the tension switch 44. This makes it possible to prevent damage such as leakage from the tension switch 44, which is a device in the pit 2a.

[0048] When the tension switch 44 detects an abnormality in the position detection device 20, the elevator is stopped suddenly based on a safety command. This prevents the elevator from continuing to run while an abnormality in the position detection device 20 has been detected, thereby maintaining safety.

[0049] In a flooded state, if the power supply to the tension switch 44 is cut off by a disconnect command, the tension switch signal output from the tension switch 44 is stopped, and the tension switch state becomes "abnormal." However, in the safety circuit processing, if a disconnect command is input, the safety management processing is not executed but skipped. This makes it possible to prevent a "no driving" safety command from being generated in response to the power supply to the tension switch 44 being cut off.

[0050] 1-5. Variations The elevator system of the first embodiment may employ the following modified aspects. These modified aspects may also be applied to elevator systems of other embodiments described later.

[0051] 1-5-1.Control device 10 8 is a diagram showing a modified example of the hardware resources of the control device. The control device 10 includes, as hardware resources, a processing circuit 103 including a processor 101 and a memory 102. The processing circuit 103 may include multiple processors 101. The processing circuit 103 may include multiple memories 102.

[0052] In this embodiment, the functions of the control device 10 can be realized by software written as a program, firmware, or a combination of software and firmware. The program is stored in the memory 102. Alternatively, the program may be recorded in a program product such as a computer-readable recording medium. The control device 10 realizes each function by executing the program stored in the memory 102 by the processor 101 (computer).

[0053] The processor 101 is also called a CPU (Central Processing Unit), central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, or DSP. The memory 102 may be a semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, or a DVD. Possible semiconductor memories include RAM, ROM, flash memory, EPROM, and EEPROM.

[0054] Fig. 9 is a diagram showing another modified example of the hardware resources of the control device. In the example shown in Fig. 9, the control device 10 includes a processor 101, a memory 102, and a processing circuit 103 including dedicated hardware 104. Fig. 9 shows an example in which some of the functions of the control device 10 are realized by the dedicated hardware 104. All of the functions of the control device 10 may be realized by the dedicated hardware 104. As the dedicated hardware 104, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination of these can be adopted.

[0055] 1-5-2.Anomaly detection device The abnormality detection device is not limited to the configuration of the tension switch 44. In other words, the abnormality detection device may adopt other known device structures as long as it can detect an abnormality in the position detection device 20 and is a device that may malfunction due to flooding in the pit 2a.

[0056] 2. Embodiment 2 In the second embodiment, differences from the example disclosed in the first embodiment will be described in particular detail. For features not described in the second embodiment, any of the features of the example disclosed in the first embodiment may be adopted.

[0057] 2-1. Features of the elevator system according to the second embodiment Fig. 10 is a schematic configuration diagram of an elevator system according to embodiment 2. Elevator system 100 according to embodiment 2 has a similar configuration to elevator system 100 according to embodiment 1, except for a configuration in which an absolute positioning system 50 is provided instead of position detection device 20. The absolute positioning system 50 is a system that functions as a second detection device that detects a second signal synchronized with the upward and downward movement of car 6 in hoistway 2. The absolute positioning system will hereinafter be referred to as "APS."

[0058] The APS 50 includes an APS code tape 52 as a detection object and an APS sensor 54 as a detection device. The APS code tape 52 is a long body provided along the vertical direction in the hoistway 2. Typically, absolute position information is continuously set on the APS code tape 52 in accordance with the position in the moving direction in the hoistway 2. The absolute position information is information set by continuously varying the magnetic or optical characteristics from the top to the bottom in the vertical direction of the APS code tape 52. The upper and lower ends of the APS code tape 52 are fixed in a state in which a tensile force is applied. In addition, a tension switch 44 is installed on the lower end side of the APS code tape 52 as an abnormality detection device for detecting a break or detachment of the APS code tape 52. The configuration of the tension switch 44 is the same as that of the elevator system 100 of the first embodiment.

[0059] The APS sensor 54 is an absolute position sensor for reading absolute position information from the APS code tape 52. The APS sensor 54 is mounted on the car 6 by a bracket so as to be in a position facing the APS code tape 52.

[0060] The detection method of the APS sensor 54 employs a method capable of reading absolute position information from the APS code tape 52, such as a magnetic method or an optical method. The APS sensor 54 detects a signal corresponding to the absolute position information by reading the APS code tape 52, and transmits the second signal to the operation management unit 12 of the control device 10.

[0061] The elevator system 100 according to the second embodiment executes similar processing to that of the elevator system 100 according to the first embodiment, by replacing the position detection device 20 with an APS 50. According to the elevator system 100 configured in this way, it is possible to obtain the same actions and effects as the elevator system 100 according to the first embodiment.

[0062] 3.Embodiment 3. In the third embodiment, differences from the example disclosed in the first embodiment will be described in particular detail. For features not described in the third embodiment, any of the features of the example disclosed in the first embodiment may be adopted.

[0063] 3-1. Features of the elevator system according to the third embodiment Fig. 11 is a schematic configuration diagram of an elevator system according to embodiment 3. The elevator system according to embodiment 3 has a similar configuration to elevator system 100 according to embodiment 1, except for the configuration of control device 10. Note that the elevator system according to embodiment 3 may have a similar configuration to elevator system 100 according to embodiment 2, except for the configuration of control device 10.

[0064] The control device 10 includes an operation control unit 12 that mainly manages the operation of the elevator, a drive unit 14 that mainly controls the driving of the elevator, and a safety monitoring unit 16 that mainly manages the safety of the elevator.

[0065] The drive unit 14 has a similar configuration to the drive unit 14 of the elevator system 100 according to embodiment 1. The traffic management unit 12 has the functions of a traffic management processing unit 121 and a car movement processing unit 125 among the functions of the traffic management unit 12 of the elevator system 100 according to embodiment 1. The safety monitoring unit 16 has the functions of a flood detection processing unit 122, a safety circuit processing unit 123, and a car position / speed detection processing unit 124 among the functions of the traffic management unit 12 of the elevator system 100 according to embodiment 1. The safety monitoring unit 16 is configured as a unit separate and independent from the traffic management unit 12 and the drive unit 14.

[0066] According to this configuration, the function of executing flood detection processing and safety circuit processing related to elevator safety can be configured separately and independently from the function of executing elevator operation management processing and car movement processing. This ensures the independence of the functions related to elevator safety, further improving the safety of the system.

[0067] 4.Other Although the preferred embodiments have been described in detail above, the present disclosure is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims.

[0068] Various aspects of the present disclosure are summarized below as appendices.

[0069] (Appendix 1) a flood sensor that detects a flooded state of a pit under the elevator shaft; A first detection device is disposed above the pit and detects a first signal corresponding to a rotation amount of a motor of a hoist that raises and lowers a car; A second detection device that detects a second signal synchronized with the vertical movement of the car; an abnormality detection device that is at least partially disposed in the pit below the height of the flooding state and detects an abnormality in the second detection device; a control device that executes movement control of the car using the second signal when the flooding sensor does not detect the flooding state, and executes movement control of the car using the first signal when the flooding sensor detects the flooding state; An elevator system comprising: (Appendix 2) The second detection device is A governor rope that moves up and down in response to the elevation and lowering of the car; a governor encoder that detects, as the second signal, a signal corresponding to rotation of a governor sheave that rotates due to movement of the governor rope; 2. The elevator system of claim 1, comprising: (Appendix 3) 3. The elevator system according to claim 2, wherein the abnormality detection device includes a tension switch that detects a break or detachment of the governor rope based on a change in the tensile force applied to the governor rope. (Appendix 4) The second detection device is a detection object that is laid along the vertical direction of the elevator shaft and has absolute position information continuously set in accordance with the vertical position; an absolute position sensor that is installed in the car and detects a signal corresponding to the absolute position information as the second signal by reading the object to be detected; 2. The elevator system of claim 1, comprising: (Appendix 5) 5. The elevator system of claim 4, wherein the abnormality detection device includes a tension switch that detects a break or detachment of the detection object based on a change in the tensile force applied to the detection object. (Appendix 6) 6. The elevator system according to any one of claims 1 to 5, further comprising a power supply cut-off device that cuts off power supply to the abnormality detection device when the flooding sensor detects the flooding state. (Appendix 7) The control device executes a safety management process for forcibly stopping the car when the abnormality detection device detects an abnormality in the second detection device. The elevator system according to any one of claims 1 to 6, configured as follows: (Appendix 8) 8. The elevator system according to claim 7, wherein the control device is configured not to execute the safety management process when power supply to the abnormality detection device is cut off. (Appendix 9) The control device includes: An operation control unit that controls the operation of the car; A safety monitoring unit is provided which is separate and independent from the operation management unit. The safety monitoring unit includes: When the flooding sensor detects the flooding state, the flooding sensor is configured to transmit an operation command to the traffic management unit, When the operation control unit does not receive the operation command, the operation control unit executes the movement control of the car using the second signal, and when the operation control unit receives the operation command, the operation control unit executes the movement control of the car using the first signal. 2. The elevator system of claim 1, configured as follows: (Appendix 10) The safety monitoring unit includes: The abnormality detection device is configured to execute a safety management process for forcibly stopping the car when the abnormality detection device detects an abnormality in the second detection device, When the flood sensor detects the flood state, the safety monitoring unit operates a power cutoff device to cut off power supply to the abnormality detection device and does not execute the safety management process. 10. The elevator system of claim 9, configured as follows: [Explanation of symbols]

[0070] 2 elevator shaft, 2a pit, 3 hoist, 4 main rope, 5 counterweight, 6 cage, 8a power supply, 8b pit equipment power supply, 10 control device, 12 operation control unit, 14 drive unit, 16 safety monitoring unit, 20 position detection device, 22 governor rope, 24 governor sheave, 26 governor encoder, 32 sheave, 34 motor, 36 motor encoder, 42 flood sensor, 44 tension switch, 46 disconnect switch, 50 absolute positioning system (APS), 52 APS code tape, 54 APS sensor, 100 elevator system, 101 processor, 102 memory, 103 processing circuit, 104 dedicated hardware, 121 operation control processing unit, 122 Flooding detection processing section, 123 safety circuit processing section, 124 cage position / speed detection processing section, 125 cage movement processing section

Claims

1. a flood sensor that detects a flooded state of a pit under the elevator shaft; A first detection device is disposed above the pit and detects a first signal corresponding to a rotation amount of a motor of a hoist that raises and lowers a car; A second detection device that detects a second signal synchronized with the vertical movement of the car; an abnormality detection device that is at least partially disposed in the pit below the height of the flooding state and detects an abnormality in the second detection device; a control device that executes movement control of the car using the second signal when the flooding sensor does not detect the flooding state, and executes movement control of the car using the first signal when the flooding sensor detects the flooding state; An elevator system comprising:

2. The second detection device is A governor rope that moves up and down in response to the elevation and lowering of the car; a governor encoder that detects, as the second signal, a signal corresponding to rotation of a governor sheave that rotates due to movement of the governor rope; 2. The elevator system of claim 1, comprising:

3. 3. The elevator system according to claim 2, wherein the abnormality detection device includes a tension switch that detects a break or detachment of the governor rope based on a change in a tensile force applied to the governor rope.

4. The second detection device is a detection object that is laid along the vertical direction of the elevator shaft and has absolute position information continuously set in accordance with the vertical position; an absolute position sensor that is installed in the car and detects a signal corresponding to the absolute position information as the second signal by reading the object to be detected; 2. The elevator system of claim 1, comprising:

5. The elevator system according to claim 4, wherein the abnormality detection device includes a tension switch that detects a break or detachment of the detection object based on a change in the tensile force applied to the detection object.

6. 6. The elevator system according to claim 1, further comprising a power supply cut-off device that cuts off power supply to the abnormality detection device when the flooding sensor detects the flooding state.

7. The control device executes a safety management process for forcibly stopping the car when the abnormality detection device detects an abnormality in the second detection device.

7. The elevator system according to claim 6, wherein the elevator system is configured as follows:

8. The elevator system according to claim 7, wherein the control device is configured not to execute the safety management process when power supply to the abnormality detection device is cut off.

9. The control device includes: An operation control unit that controls the operation of the car; A safety monitoring unit is provided which is separate and independent from the operation management unit. The safety monitoring unit includes: When the flooding sensor detects the flooding state, the flooding sensor is configured to transmit an operation command to the traffic management unit, When the operation control unit does not receive the operation command, the operation control unit executes the movement control of the car using the second signal, and when the operation control unit receives the operation command, the operation control unit executes the movement control of the car using the first signal.

2. The elevator system of claim 1, configured as follows:

10. The safety monitoring unit includes: The abnormality detection device is configured to execute a safety management process for forcibly stopping the car when the abnormality detection device detects an abnormality in the second detection device, When the flood sensor detects the flood state, the safety monitoring unit operates a power cutoff device to cut off power supply to the abnormality detection device and does not execute the safety management process.

10. The elevator system of claim 9, configured as follows:

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