Door monitoring system for an elevator

Abstract

Provided is a door monitoring system for an elevator that can reliably monitor the opening and closing state of a car door without using a control signal for the elevator to prevent door travel. The door monitoring system for an elevator includes a first acceleration sensor, a position sensor, and a monitoring device. The first acceleration sensor is provided to a car door or a door structure that moves integrally with the car door, detects the acceleration of the opening and closing direction of the car door, and the car door opens and closes a car doorway provided to a car of the elevator. The position sensor detects the full closing of the car door. Also, the monitoring device monitors the opening and closing state of the car door based on the detection value of the first acceleration sensor during the opening of the car door after the full closing of the car door is detected by the position sensor without using a control signal for opening and closing the car door.

Description

Technical Field

[0001] This disclosure relates to a door monitoring system for monitoring the opening and closing status of elevator car doors. Background Technology

[0002] Patent Document 1 discloses a technique for detecting elevator malfunctions in older elevators where control signals cannot be obtained. This technique incorporates at least three accelerometers and uses information obtained from these sensors to monitor car movement, door opening and closing, and vibrations in the landing direction of the car doors, thereby detecting malfunctions.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-189416 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] In the technology of Patent Document 1, the opening and closing direction of the car door can be determined based on the time-series changes in acceleration detected by an accelerometer, but it cannot directly detect when the car door is fully closed. Therefore, in the technology that only uses an accelerometer to determine the opening and closing state of the car door, it is possible to mistakenly determine that the car door is fully closed and allow it to open.

[0008] This disclosure was made to solve the above-mentioned problems, and its purpose is to provide an elevator door monitoring system that can reliably monitor the opening and closing status of the car door to prevent the door from opening and moving without using elevator control signals.

[0009] Methods for solving problems

[0010] The elevator door monitoring system disclosed herein includes: a first acceleration sensor disposed on the car door or a door structure integrally movable with the car door, which detects the acceleration in the opening and closing direction of the car door, wherein the car door opens and closes the car entrance / exit of the elevator car; a position sensor that detects that the car door is fully closed; and a monitoring device that does not use a control signal for opening and closing the car door, but monitors the state of the car door based on the detection value of the first acceleration sensor during the opening period after the position sensor detects that the car door is fully closed.

[0011] Invention Effects

[0012] According to the technology disclosed herein, during the opening period after the car door is detected to be fully closed, the status of the car door is monitored based on the detection value of a first acceleration sensor. Therefore, the opening and closing status of the car door can be reliably monitored to prevent the car from traveling with the door open, without using elevator control signals. Attached Figure Description

[0013] Figure 1 This is a front view used to illustrate the structure of the elevator door device in Embodiment 1.

[0014] Figure 2 It is Figure 1 A magnified schematic diagram of a portion of section AA in the diagram.

[0015] Figure 3 This is a block diagram of the door monitoring system in Implementation Method 1.

[0016] Figure 4 This is a diagram illustrating the various functions of the monitoring device in the door monitoring system of Embodiment 1.

[0017] Figure 5 This is a timing diagram illustrating an example of the change in the opening and closing state of the car door monitored in the door monitoring system of Embodiment 1.

[0018] Figure 6 This is a flowchart showing the routines executed in the door monitoring system of Implementation Method 1.

[0019] Figure 7 This is a diagram illustrating a variation of the hardware resources of a monitoring device.

[0020] Figure 8 This is a front view used to illustrate the features of the elevator door monitoring system in Embodiment 2.

[0021] Figure 9 This is a timing diagram illustrating an example of the change in the opening and closing state of the car door monitored in the door monitoring system of Embodiment 2.

[0022] Figure 10 This is a flowchart showing the routines executed in the door monitoring system of Implementation Method 2.

[0023] Figure 11 This is a flowchart showing the routines executed in the door monitoring system of Implementation Method 2.

[0024] Figure 12 This is a timing diagram illustrating an example of the change in the opening and closing state of the car door monitored in the door monitoring system of Embodiment 3.

[0025] Figure 13 This is a flowchart showing the routines executed in the door monitoring system of Implementation Method 3.

[0026] Figure 14 This is a front view used to illustrate the features of the elevator door monitoring system of Embodiment 4.

[0027] Figure 15 This is a flowchart showing the routines executed in the door monitoring system of Implementation Method 4. Detailed Implementation

[0028] Hereinafter, the embodiments will be described with reference to the accompanying drawings. Furthermore, common elements in all figures are labeled with the same reference numerals, and repeated descriptions are omitted.

[0029] Implementation method 1.

[0030] 1-1. Structure of the elevator door device in Embodiment 1

[0031] Figure 1 This is a front view illustrating the structure of the elevator door device according to Embodiment 1. The elevator shaft extends through all floors of the building. At each floor, a landing is formed near the shaft. A car 4 is installed within the shaft. Landing entrances / exits are formed between each landing and the shaft. Landing doors are installed at each landing entrance / exit. A car entrance / exit is formed on the landing side of the car 4. A door device 1 is installed at each car entrance / exit. The door device 1 includes a car door 2 and a door opening / closing mechanism 3 for opening and closing the car door 2.

[0032] The car door 2 is configured to open and close the car entrance / exit. Typically, the car doors 2 are arranged in pairs, opening centrally. As another example, the car doors 2 may also be configured to open from one side. A door frame 5 is fixed above the car entrance / exit. That is, the door frame 5 functions as a fixed element to the car 4. Various components of the door opening / closing mechanism 3 are provided on the door frame 5. As the main structure, the door opening / closing mechanism 3 includes a suspension component 6, a roller 7, a track 8, two pulleys 9, a belt 10, a connecting component 11, and a door motor 12. The suspension component 6 is fixed above the car door 2. That is, the suspension component 6 functions as a door structure that moves integrally with the car door 2. The roller 7 is located above the suspension component 6. The track 8 is located above the car door 2 on the door frame 5. That is, the suspension component 6 is slidably suspended on the track 8 via the roller 7. The two pulleys 9 are arranged horizontally spaced above the track 8 on the door frame 5. The belt 10 is arranged around the two pulleys 9. In addition, a door motor 12 is provided in the door frame 5 to rotate the pulleys 9.

[0033] One end of one connecting component 11 is fixed to the belt 10 above the pulley 9. The other end of one connecting component 11 is fixed to one side of the suspension component 6. One end of the other connecting component 11 is fixed to the belt 10 below the pulley 9. The other ends of both connecting components 11 are fixed to the other side of the suspension component 6.

[0034] In such an elevator, when the car 4 is positioned adjacent to a landing, a portion of the car door 2 of the car 4 engages with a portion of the landing door. In this state, the door motor 12 is driven. This drive causes the pulley 9 to rotate. This rotation causes the belt 10 to move. At this time, the belt 10 moves to the left or right on the upper side of the pulley 9. Conversely, the belt 10 moves to the left or right on the lower side of the pulley 9.

[0035] As this movement occurs, the connecting components 11 move in opposite directions. Accompanying this movement, the suspension components 6 move in opposite directions. As this movement occurs, the car doors 2 move in opposite directions. At this time, the rollers 7 travel on the track 8. Therefore, the car doors 2 smoothly open and close the car entrance / exit. With this opening and closing, a pair of landing doors move in opposite directions. Through this movement, the landing doors open and close the landing entrance / exit.

[0036] 1-2. Structure of the elevator door monitoring system in Implementation Method 1

[0037] Figure 2 It is Figure 1 A magnified schematic diagram of a portion of section AA in the diagram. Figure 3 This is a block diagram of the door monitoring system in Implementation Method 1. Referring also to the following... Figure 2 and Figure 3 The features of the elevator door monitoring system in Embodiment 1 will be described. The elevator in Embodiment 1 includes a door monitoring system 100. The door monitoring system 100 is a system that monitors the state of the car door 2 without using control signals to control the elevator. The door monitoring system 100 includes a first acceleration sensor 20, a position sensor 22, a first magnet 24, and a monitoring device 30.

[0038] The first acceleration sensor 20 is a sensor used to detect the acceleration in the opening and closing direction of the car door 2. The type and structure of the first acceleration sensor 20 are not limited. Hereinafter, the acceleration detected by the first acceleration sensor 20 will be referred to as "door opening and closing acceleration". The first acceleration sensor 20 is installed on the suspension component 6, which is a door structure that moves and opens / closes integrally with the car door 2. Furthermore, the location of the first acceleration sensor 20 is not limited; it can be installed on the car door 2 or a door structure that moves and opens / closes integrally with the car door. The first acceleration sensor 20 is electrically connected to the monitoring device 30 via cable 26.

[0039] Position sensor 22 is a sensor used to detect when the car door 2 is fully closed. The type and structure of position sensor 22 are not limited. In the door monitoring system 100 of Embodiment 1, position sensor 22 is a Hall sensor that detects the approach of a magnet and outputs a signal. Position sensor 22 is provided on suspension component 6. Furthermore, a first magnet 24 is provided on door frame 5. The first magnet 24 is positioned opposite to position sensor 22 in the fully closed position of car door 2 and can be detected by position sensor 22. Therefore, position sensor 22 outputs a position signal in response to the approach of the first magnet 24 when car door 2 is fully closed. This position signal is hereinafter referred to as the "fully closed signal". Position sensor 22 is electrically connected to monitoring device 30 via cable 28.

[0040] The monitoring device 30 is a microcomputer equipped with at least one processor 40 and at least one storage device 50. The monitoring device 30 is also referred to as an information processing device. The monitoring device 30 is disposed on the suspension component 6.

[0041] The storage device 50 stores a monitoring program 52 and various data 54 associated with the monitoring program 52. The processor 40 includes a CPU (Central Processing Unit). The processor 40 reads and executes the monitoring program 52 to realize the various functions of the monitoring device 30. In addition, the monitoring program 52 can also be recorded on a computer-readable recording medium.

[0042] Figure 4 This is a diagram illustrating the various functions of the monitoring device in the door monitoring system of Embodiment 1. As shown in the diagram, the monitoring device 30 includes an input processing unit 31, a door opening period determination unit 32, and a door status calculation unit 33 as its functional blocks.

[0043] The input processing unit 31 is a function block that processes the door opening and closing acceleration detected by the first acceleration sensor 20 and the position signal detected by the position sensor 22. This processing will be referred to as "input processing" below. The door opening period determination unit 32 is a function block that determines the start and end times of the door opening period of the car door 2 based on the information input through the input processing. This processing will be referred to as "door opening period determination processing" below. Furthermore, the "door opening period" here refers to the period from when the fully closed car door 2 begins to open until it closes completely again.

[0044] The door state calculation unit 33 is a function block used to calculate the state of the car door 2 based on the door opening and closing acceleration during the opening of the car door 2 and store it in the data 54 area of ​​the storage device 50. Hereinafter, this process will be referred to as "calculation processing". Furthermore, the state of the car door 2 here includes the door opening and closing acceleration, the door opening and closing speed, and the door opening and closing position. In the calculation processing, the door opening and closing speed is calculated by integrating the door opening and closing acceleration. Additionally, the door opening and closing position is calculated by integrating the door opening and closing speed.

[0045] 1-3. Operation of the elevator door monitoring system in Implementation Method 1

[0046] Next, the operation of the elevator door monitoring system 100 in Embodiment 1 will be explained.

[0047] The monitoring device 30 can use the changes in door opening and closing acceleration detected by the first accelerometer 20 to calculate the changes in door opening and closing speed and door opening and closing position. However, the first accelerometer 20 cannot directly detect the door opening and closing position of the car door 2. Therefore, as the calculation process continues, the effects of calculation errors and interference errors gradually accumulate, which may lead to misjudgment of the door opening and closing position. In addition, for example, if the opening and closing movement of the car door 2 is temporarily stopped at a position different from the fully closed position due to foreign objects being caught in the car door 2, it may be mistakenly judged that the car door 2 is in the fully closed state.

[0048] Therefore, the door monitoring system 100 of Embodiment 1 includes a position sensor 22 that detects when the car door 2 is fully closed. During the door opening period determination process using the position signal from the position sensor 22, the monitoring device 30 can accurately determine the start time of door opening from when the car door 2 is fully closed. Therefore, the monitoring device 30 can, during the calculation process, calculate with high precision the door opening speed and door opening position during the door opening period based on the change in door opening acceleration from when the car door 2 is fully closed. Thus, the door monitoring system 100 can monitor the state of the car door 2 without using elevator control signals.

[0049] 1-4. Specific examples of changes in the opening and closing state of the car door

[0050] Figure 5 This is a timing diagram illustrating an example of the changes in the opening and closing state of the car door monitored in the door monitoring system of Embodiment 1. Figure 5 In the diagram, (A) represents the change in the position signal of the position sensor 22, (B) represents the change in the door switch acceleration calculated based on the detection value of the first acceleration sensor 20, (C) represents the change in the door switch velocity obtained by integrating the door switch acceleration, and (D) represents the change in the door switch position obtained by further integrating the door switch velocity.

[0051] exist Figure 5 In the example shown, the door opening period determination unit 32 determines the opening period from the time t1 when the fully closed signal, which serves as a position signal, switches from detection to no detection, to the time t8 when the fully closed signal switches from no detection to detection. The door state calculation unit 33 performs calculation processing during the determined opening period, calculating the state of the car door 2. Figure 5 In the example shown, during the period from time t1 to time t4, the door opening / closing position of car door 2 moves in the opening direction. During the period from time t4 to time t5, since the door opening / closing acceleration and speed are both zero, the door opening / closing position remains constant in the open state. Then, during the period from time t5 to time t8, the door opening / closing position of car door 2 moves in the closing direction, and at time t8, car door 2 is fully closed. Thus, according to the door monitoring system 100 of Embodiment 1, the state of car door 2 can be monitored during the opening period determined based on the fully closed signal.

[0052] 1-5. Specific processes performed in the elevator door monitoring system of Implementation Method 1

[0053] Next, the specific processes performed in the elevator door monitoring system 100 of Embodiment 1 will be described. Figure 6 This is a flowchart showing the routines executed in the door monitoring system of Implementation Method 1. Figure 6 The routine shown is executed by the processor 40 of the monitoring device 30 executing the monitoring program 52.

[0054] Figure 6 The steps S100 and S102 of the illustrated routine are equivalent to the determination process during door opening. Specifically, in step S100, it is determined whether the car door 2 is detected as fully closed. Here, it is determined whether the position sensor 22 detects a fully closed signal. As a result, if the determination is confirmed to be true, the process proceeds to step S102; if the determination is not confirmed to be true, the process of this routine ends.

[0055] In step S102, it is determined whether the car door 2 has begun to open. Here, it is determined whether the fully closed signal detected by the position sensor 22 has changed to no detection. Alternatively, it is determined whether the door opening and closing acceleration detected by the first acceleration sensor 20 exceeds the determination value indicating door opening. The determination value here is, for example, 0 or a positive value near that value. As a result, if the determination is confirmed to be true, it is determined to be the beginning of the door opening period, and the process proceeds to step S104. On the other hand, if the determination is not confirmed to be true, the process of step S102 is repeatedly executed until the determination is confirmed to be true.

[0056] Steps S104 and S106 are equivalent to computational processing. Specifically, in step S104, the door opening / closing acceleration detected by the first accelerometer 20 is obtained through input processing. When the processing in step S104 is completed, the process proceeds to the next step, S106.

[0057] In step S106, the state of the car door 2 is calculated. Here, the door opening / closing acceleration, door opening / closing speed, and door opening / closing position are calculated as the state of the car door 2. The calculated state of the car door 2 is stored in the data 54 area of ​​the storage device 50. When the processing in step S106 is completed, the process proceeds to step S108.

[0058] The process in step S108 is equivalent to the door opening period determination process. Specifically, in step S108, it is determined whether the car door 2 has been fully closed. Here, it is determined whether the fully closed signal received from the position sensor 22 has changed from no detection to detection. As a result, if the determination is confirmed to be true, it is determined to be the end of the door opening period, and the process of this routine ends. On the other hand, if the determination is not confirmed to be true, the process in step S104 is executed again. Thus, the processes in steps S104 to S108 are repeatedly executed until the determination in step S108 is true.

[0059] As can be seen from the above description, the elevator door monitoring system 100 according to Embodiment 1 can monitor the status of the car door 2 without using the elevator control signal.

[0060] Furthermore, the first acceleration sensor 20, the position sensor 22, and the monitoring device 30 constituting the door monitoring system 100 are mounted on a common suspension component 6, thus allowing the first acceleration sensor 20 and the position sensor 22 to be wiredly connected to the monitoring device 30 via cables 26 and 28. This eliminates the need for complex structures such as wireless functionality, simplifying the system.

[0061] 1-6. Variations

[0062] The door monitoring system 100 of Embodiment 1 can also be modified as follows. Furthermore, the modifications shown below can also be applied to door monitoring systems of other embodiments described later.

[0063] 1-6-1. Monitoring device 30

[0064] Figure 7 This is a diagram illustrating a variation of the hardware resources of a monitoring device. Figure 7 In the example shown, the monitoring device 30 includes, for example, a processing circuit 62 that includes a processor 40, a storage device 50 as memory, and dedicated hardware 60. Figure 7This illustrates an example of implementing a portion of the functions of the monitoring device 30 using dedicated hardware 60. All the functions of the monitoring device 30 can also be implemented by dedicated hardware 60. The dedicated hardware 60 can be a single circuit, a composite circuit, a programmable processor, a parallel programmable processor, an ASIC, an FPGA, or a combination thereof.

[0065] The storage device 50 can also function independently of the monitoring device 30, with the cloud or similar devices performing the same function.

[0066] The functional configuration of the monitoring device 30 is not limited. That is, all or part of the functions of the monitoring device 30 can also be mounted on the first acceleration sensor 20, the position sensor 22, or a cloud server that can communicate.

[0067] The configuration of the monitoring device 30 is not limited to the suspension component 6. However, if the monitoring device 30 is installed on the car door 2 or a door structure that opens and closes integrally with the car door 2, a wired connection can be made between the first acceleration sensor 20 and the position sensor 22 and the monitoring device 30.

[0068] The monitoring device 30 can also switch to a power-saving mode that suppresses power consumption compared to the normal mode when it detects that the car door 2 is fully closed. In this case, the monitoring device 30 is configured to switch to the power-saving mode if the determination is confirmed in step S100, and then switch to the normal mode if the determination is confirmed in the subsequent step S102.

[0069] 1-6-2. First accelerometer 20 and position sensor 22

[0070] The first accelerometer 20 and the position sensor 22 can also be integrated into one unit. Alternatively, one or both of the first accelerometer 20 and the position sensor 22 can be integrated into the monitoring device 30.

[0071] Implementation method 2.

[0072] 2-1. Features of the elevator door monitoring system in Implementation Method 2

[0073] Figure 8 This is a front view used to illustrate the features of the elevator door monitoring system in Embodiment 2. Furthermore, in Figure 8 In the door device shown, the same or equivalent parts as the door device 1 in Embodiment 1 are labeled with the same reference numerals and the description is omitted.

[0074] In addition to the first acceleration sensor 20, position sensor 22, first magnet 24 and monitoring device 30, the door monitoring system 100 of embodiment 2 also includes a second magnet 25.

[0075] Position sensor 22 is a Hall sensor that detects the approach of the magnet and outputs a signal. Furthermore, a second magnet 25 is disposed on the door frame 5. The second magnet 25 is a magnet with a polarity different from that of the first magnet 24, and is disposed at a position that is separate from and opposite to position sensor 22 at the fully open position of car door 2, and can be detected by position sensor 22. Therefore, when car door 2 is fully open, position sensor 22 outputs a position signal different from the fully closed signal in response to the approach of the second magnet 25. This position signal is hereinafter referred to as the "fully open signal".

[0076] In the door monitoring system 100 of Embodiment 2, the door opening period determination unit 32 determines the period from when the fully closed car door 2 starts to open until it is fully open, or the period from when the fully open car door 2 starts to close until it is fully closed, as the door opening period during the door opening period determination process.

[0077] Figure 9 This is a timing diagram illustrating an example of the changes in the opening and closing state of the car door monitored in the door monitoring system of Embodiment 2. Figure 5 In the diagram, (A) represents the change in the position signal of the position sensor 22, (B) represents the change in the door switch acceleration calculated based on the detection value of the first acceleration sensor 20, (C) represents the change in the door switch velocity obtained by integrating the door switch acceleration, and (D) represents the change in the door switch position obtained by further integrating the door switch velocity.

[0078] In the example shown in the figure, a fully off signal of position sensor 22 is detected during the period from time t0 to time t1, a fully open signal of position sensor 22 is detected during the period from time t4 to time t5, and then a fully off signal of position sensor 22 is detected again during the period starting from time t8. In this case, the door opening period determination unit 32 determines one or both of the period from time t1 to time t4 and the period from time t5 to time t8 as the door opening period during the door opening period determination process.

[0079] The door status calculation unit 33 performs calculation processing during the determined door opening period to calculate the status of the car door 2. In this way, the door monitoring system 100 according to Embodiment 2 can monitor the status of the car door 2 during the door opening period determined based on the fully open signal and fully closed signal of the position sensor 22.

[0080] 2-2. Specific processing performed in the elevator door monitoring system of Implementation Method 2

[0081] Next, the specific processing performed in the elevator door monitoring system 100 of Embodiment 2 will be described. Figure 10 and Figure 11 This is a flowchart showing the routines executed in the door monitoring system of Implementation Method 2. Figure 10 and Figure 11 The routine shown is executed by the processor 40 of the monitoring device 30 executing the monitoring program 52.

[0082] Figure 10 The steps S200 and S202 of the illustrated routine are equivalent to the door opening determination process. Here, the same process as steps S100 and S102 is performed. If the determination is confirmed to be true in step S202, the process proceeds to step S204.

[0083] The processes in steps S204 and S206 are equivalent to computational processing. Here, the same processing as in steps S104 and S106 is performed. When the processing in step S206 is completed, the process proceeds to step S208.

[0084] The processing in step S208 is equivalent to the door opening period determination process. Specifically, in step S208, it is determined whether the car door 2 has fully opened. Here, it is determined whether the position sensor 22 has detected a fully open signal. As a result, if the determination is confirmed to be true, it is determined that it is the end of the door opening period, and the processing of this routine proceeds. Figure 11 The example shown is step S210. On the other hand, if the determination is not confirmed, the process of step S204 is executed again. Thus, the processes of steps S204 to S208 are executed repeatedly until the determination of step S208 is confirmed.

[0085] The process in step S210 is equivalent to the determination process during door opening. Specifically, in step S210, it is determined whether the car door 2 has begun to close. Here, it is determined whether the position sensor 22 no longer detects a fully open signal. Alternatively, it is determined whether the door opening and closing acceleration detected by the first acceleration sensor 20 exceeds the determination value indicating that the door is closed. The determination value here is, for example, 0 or a negative value near that value. As a result, if the determination is confirmed to be true, the process proceeds to step S212; if the determination is not confirmed to be true, the process in step S210 is repeatedly executed until the determination is confirmed to be true.

[0086] The processes in steps S212 and S214 are equivalent to computational processing. Here, the same processing as in steps S204 and S206 is performed. Upon completion of the process in step S214, the process proceeds to the next step, S216.

[0087] The process in step S216 is equivalent to the determination process during door opening. Specifically, in step S216, it is determined whether the car door 2 has been fully closed. Here, the same process as in step S108 is performed. As a result, if the determination is confirmed to be true, the process of this routine ends; if the determination is not confirmed to be true, the process of step S212 is executed again. Thus, the processes of steps S212 to S216 are repeatedly executed until the determination in step S216 is true.

[0088] As can be seen from the above description, the elevator door monitoring system 100 according to Embodiment 2 can monitor the status of the car door 2 without using elevator control signals during the opening period from when the car door 2 starts to open from when it is fully closed until it is fully open, and during the opening period from when the car door 2 starts to close from when it is fully open until it is fully closed.

[0089] Implementation method 3.

[0090] 3-1. Features of the elevator door monitoring system in Implementation Method 3

[0091] The door monitoring system 100 of Embodiment 3 is the same as the door monitoring system 100 of Embodiment 2, except that the polarity of the second magnet 25 is the same as that of the first magnet 24.

[0092] The position sensor 22 is a Hall sensor that detects the approach of the magnet and outputs a position signal. Furthermore, a first magnet 24 and a second magnet 25 are disposed in the door frame 5. The second magnet 25 is a magnet having the same polarity as the first magnet 24. With this configuration, the position sensor 22 outputs a fully closed signal in response to the approach of the first magnet 24 when the car door 2 is fully closed. Additionally, the position sensor 22 outputs a fully open signal in response to the approach of the second magnet 25 when the car door 2 is fully open.

[0093] Here, since the second magnet 25 is a magnet with the same polarity as the first magnet 24, it is impossible to distinguish between the fully closed signal and the fully open signal. Therefore, the door opening period determination unit 32 of the door monitoring system 100 in Embodiment 2 determines whether the door opening period starts from when the car door 2 is fully closed or from when it is fully open based on the sign of the door opening acceleration at the moment when the fully closed signal or the fully open signal, which is a position signal, switches from detection to no detection, i.e., the direction of the door opening speed at that moment.

[0094] Figure 12 This is a timing diagram illustrating an example of the changes in the opening and closing state of the car door monitored in the door monitoring system of Embodiment 3. Figure 12In the diagram, (A) represents the change in the position signal of the position sensor 22, (B) represents the change in the door switch acceleration calculated based on the detection value of the first acceleration sensor 20, (C) represents the change in the door switch velocity obtained by integrating the door switch acceleration, and (D) represents the change in the door switch position obtained by further integrating the door switch velocity.

[0095] In the example shown in the figure, the position signal of the position sensor 22 is detected during the period from time t0 to time t1, and a door opening acceleration (positive value) is generated during the time t1 when the position signal switches from detection to no detection. Therefore, in the door opening period determination process, the door opening period determination unit 32 determines time t1 as the time when the car door 2 starts to open from fully closed, and determines the period from time t0 to time t1 as the fully closed period.

[0096] Furthermore, in the example shown in the figure, a position signal from position sensor 22 is detected during the period from time t4 to time t5. At time t5, when the position signal switches from detection to no detection, a door opening / closing acceleration (negative value) is generated in the closing direction. Therefore, in the door opening period determination process, the door opening period determination unit 32 determines time t5 as the start of closing from full opening, determines the period from time t4 to time t5 as the full opening period, and determines time t4 as the completion of full opening. Then, in the door opening period determination process, the door opening period determination unit 32 determines the period from the start of door opening time t1 to the completion of door opening time t4 as the door opening period.

[0097] The door state calculation unit 33 performs calculation processing during the determined door opening period to calculate the state of the car door 2. Thus, according to the door monitoring system 100 of Embodiment 3, the door opening period can be determined based on the position signal of the position sensor 22 and the sign of the door opening / closing acceleration detected by the first acceleration sensor 20. Therefore, the state of the car door 2 during the door opening period can be monitored.

[0098] 3-2. Specific processing performed in the elevator door monitoring system of Implementation Method 3

[0099] Next, the specific processing performed in the elevator door monitoring system 100 of Embodiment 3 will be described. Figure 13 This is a flowchart showing the routines executed in the door monitoring system of Implementation Method 3. Figure 13 The routine shown is executed by the processor 40 of the monitoring device 30 executing the monitoring program 52.

[0100] Figure 13The steps S300, S302, and S304 of the illustrated routine are equivalent to the door opening determination process. Specifically, in step S300, it is determined whether the car door 2 is detected to be fully closed or fully open. Here, it is determined whether the position sensor 22 detects a position signal. As a result, if the determination is confirmed to be true, the process proceeds to step S302; if the determination is not confirmed to be true, the process of this routine ends.

[0101] In step S302, it is determined whether the car door 2 has begun to open. Here, it is determined whether the door opening acceleration detected by the first acceleration sensor 20 exceeds the determination value indicating that the door is open. The determination value here is 0 or a positive value near that value. As a result, if the determination is confirmed to be true, it is determined that the car door 2 has begun to open from fully closed, and the process proceeds to step S308. On the other hand, if the determination in step S302 is not confirmed to be true, the process proceeds to step S304.

[0102] In step S304, it is determined whether the car door 2 has begun to close. Here, it is determined whether the door opening and closing acceleration detected by the first acceleration sensor 20 is lower than the determination value indicating that the door is closed. The determination value here is 0 or a negative value near that value. As a result, if the determination is confirmed to be true, it is determined that the car door 2 has begun to close from fully open, and the process proceeds to step S308. On the other hand, if the determination in step S304 is not confirmed to be true, the process returns to step S302.

[0103] The processes in steps S308 and S310 are equivalent to computational processing. Here, the same processing as in steps S104 and S106 is performed. Upon completion of the process in step S310, the process proceeds to the next step, S312.

[0104] The process in step S312 is equivalent to the determination process during door opening. Specifically, in step S312, it is determined whether the car door 2 has fully opened or fully closed. Here, it is determined whether the position sensor 22 has detected a position signal. As a result, if the determination is confirmed to be true, the process of this routine ends; if the determination is not confirmed to be true, the process in step S308 is executed again. Thus, the processes of steps S308 to S312 are repeatedly executed until the determination in step S312 is true.

[0105] As can be seen from the above description, the elevator door monitoring system 100 according to Embodiment 3 can determine the door opening period based on the position signal of the position sensor 22 and the door opening and closing acceleration detected by the first acceleration sensor 20.

[0106] Implementation method 4.

[0107] 4-1. Features of the elevator door monitoring system in Implementation Method 4

[0108] Figure 14 This is a front view used to illustrate the features of the elevator door monitoring system in Embodiment 4. Furthermore, in Figure 14 In the door device shown, the same or equivalent parts as the door device 1 in Embodiment 1 are labeled with the same reference numerals and the description is omitted.

[0109] In Embodiment 4, the door monitoring system 100, in addition to the first acceleration sensor 20, position sensor 22, first magnet 24, and monitoring device 30, also includes a second acceleration sensor 21. The second acceleration sensor 21 is a sensor that detects the vertical acceleration of the elevator car 4. Hereinafter, the acceleration detected by the second acceleration sensor 21 will be referred to as "vertical acceleration." The second acceleration sensor 21 is installed on the suspension member 6, which is a door structure that moves and opens integrally with the car door 2. Furthermore, the location of the second acceleration sensor 21 is not limited; it can be installed on the car door 2 or a door structure that moves and opens integrally with the car door. The second acceleration sensor 21 is electrically connected to the monitoring device 30 via a cable 27.

[0110] Furthermore, the type and structure of the second acceleration sensor 21 are not limited. For example, the second acceleration sensor 21 can also be configured as a 2-axis sensor or a 3-axis sensor integrated with the first acceleration sensor 20.

[0111] If the monitoring device 30 detects vertical movement of the car 4 during door opening, it determines that there is an abnormality in door opening and reports the abnormality. Hereinafter, this process will be referred to as "reporting process". In this way, the door monitoring system 100 according to Embodiment 4 can detect abnormalities in door opening using the second acceleration sensor 21.

[0112] 4-2. Specific processing performed in the elevator door monitoring system of Implementation Method 4

[0113] Next, the specific processing performed in the elevator door monitoring system 100 of Embodiment 4 will be described. Figure 15 This is a flowchart showing the routines executed in the door monitoring system of Implementation Method 4. Figure 15 The routine shown is executed by the processor 40 of the monitoring device 30 executing the monitoring program 52.

[0114] Figure 15 The processes in steps S400 and S402 of the illustrated routine are equivalent to the door opening determination process. Here, the same processing as in steps S100 and S102 is performed. In step S400, if the determination is not confirmed, the process proceeds to step S404.

[0115] In step S404, it is determined whether the second acceleration sensor 21 detects vertical movement of the car 4. If the determination is confirmed, it is determined that the car 4 moved while the car door 2 was not fully closed, and the process proceeds to step S406. Conversely, if the determination is not confirmed in step S404, the process ends.

[0116] In step S406, a report is processed. This notifies the administrator that car 4 has moved with the doors open. The process ends when step S406 is completed.

[0117] If the determination is confirmed in step S402, it can be determined that the car door 2 is open. In this case, the process proceeds to step S408, where it is determined whether the second acceleration sensor 21 detects vertical movement of the car 4. If the determination is confirmed, it is determined that the car 4 moved during the door opening period, and the process proceeds to step S410. In step S410, a report is executed. This notifies the administrator that the car 4 moved while the door is open.

[0118] On the other hand, if the determination is not confirmed in step S408, the process proceeds to step S412. The processes in steps S412 and S414 are equivalent to arithmetic operations. Here, the same processing as in steps S104 and S106 is performed. When the processing in step S414 is completed, the process proceeds to the next step, S416.

[0119] The process in step S416 is equivalent to the determination process during door opening. Specifically, in step S416, it is determined whether the car door 2 has been fully closed. Here, the same process as in step S108 is performed. As a result, if the determination is confirmed to be true, the process of this routine ends; if the determination is not confirmed to be true, the process of step S408 is executed again.

[0120] As can be seen from the above description, the elevator door monitoring system 100 according to embodiment 4 can monitor abnormal door opening without using elevator control signals during the opening period from when the car door 2 is fully closed.

[0121] Label Explanation

[0122] 1: Door device; 2: Car door; 3: Door opening and closing mechanism; 4: Car; 5: Door frame; 6: Suspension component; 7: Hanging wheel; 8: Track; 9: Pulley; 10: Belt; 11: Connecting component; 12: Door motor; 20: First acceleration sensor; 21: Second acceleration sensor; 22: Position sensor; 24: First magnet; 25: Second magnet; 26, 27, 28: Cable; 30: Monitoring device; 31: Input processing unit; 32: Door opening period determination unit; 33: Door status calculation unit; 40: Processor; 50: Storage device; 52: Monitoring program; 54: Data; 60: Dedicated hardware; 62: Processing circuit; 100: Door monitoring system.

Claims

1. An elevator door monitoring system, the elevator door monitoring system having: A first acceleration sensor, disposed on the car door or a door structure that moves integrally with the car door, detects the acceleration in the opening and closing direction of the car door, wherein... The car door opens and closes the car entrance and exit located in the elevator car; A position sensor that detects the car door being fully closed; as well as The monitoring device does not use control signals for opening and closing the car door, but monitors the state of the car door based on the detection value of the first acceleration sensor during the opening period after the position sensor detects that the car door is fully closed.

2. The elevator door monitoring system according to claim 1, wherein, The position sensor and the monitoring device are installed on the car door or the door structure. The first acceleration sensor and the position sensor are respectively wired to the monitoring device.

3. The elevator door monitoring system according to claim 2, wherein, The door structure includes a suspension component fixed to the upper part of the car door and slidably suspended from a track fixed to the car. The first acceleration sensor, the position sensor, and the monitoring device are disposed on the suspension component.

4. The elevator door monitoring system according to any one of claims 1 to 3, wherein, The monitoring device is configured to determine the opening period as the time from when the car door is detected to be fully closed until it is detected to be fully closed again.

5. The elevator door monitoring system according to claim 4, wherein, The position sensor is a Hall sensor that detects approach to the magnet. The elevator door monitoring system also includes a first magnet installed on a fixed object in the car. The first magnet is positioned opposite the Hall sensor when the car door is fully closed and is detectable by the Hall sensor.

6. The elevator door monitoring system according to any one of claims 1 to 3, wherein, The position sensor is configured to also detect the full opening of the car door. The monitoring device is configured to determine the opening period as the time from when the car door is detected to be fully closed until it is detected to be fully open, or from when the car door is detected to be fully open until it is detected to be fully closed.

7. The elevator door monitoring system according to claim 6, wherein, The position sensor is a Hall sensor that detects approach to the magnet. The elevator door monitoring system also includes a first magnet installed on a fixed object in the car and a second magnet installed on a fixed object in the car. The first magnet is positioned opposite the Hall sensor when the car door is fully closed, and is detectable by the Hall sensor. The second magnet is positioned opposite the Hall sensor when the car door is fully open and can be detected by the Hall sensor.

8. The elevator door monitoring system according to claim 7, wherein, The polarity of the first magnet is different from that of the second magnet.

9. The elevator door monitoring system according to claim 7, wherein, The first magnet has the same polarity as the second magnet. The monitoring device is configured to, when the position sensor detects that the car door is fully open or fully closed, determine whether the car door detected as fully closed begins to open or the car door detected as fully open begins to close, based on whether the change in the detection value of the first acceleration sensor is positive or negative.

10. The elevator door monitoring system according to any one of claims 1 to 9, wherein, The elevator door monitoring system also includes a second acceleration sensor to detect the vertical acceleration of the car. The monitoring device is configured to monitor the movement of the car during the door opening period based on the detection value of the second acceleration sensor.

11. The elevator door monitoring system according to any one of claims 1 to 10, wherein, The monitoring device is configured to execute a power-saving mode that suppresses power consumption compared to the normal mode when the position sensor detects that the car door is fully closed.

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