JP2019199329A - Detection system for abnormality of passenger conveyor - Google Patents

Abstract

To recognize abnormal condition of a footstep during operation and appropriately address the abnormal condition.SOLUTION: A detection system for abnormality of a passenger conveyor according to one embodiment comprises: a plurality of first sensors 32a, 32b ..., 33a, 33b ... that are provided at fixed intervals in guide rails 31a, 31b and detect the abnormality of each footstep 11 during traveling; a second sensor 34 that detects a preset reference footstep among the steps 11; at least one camera 36 that is provided in an optional place on the traveling path of each footstep 11; and an information processing device 40 that detects the abnormality on the basis of a detection signal output from each of the first sensors 32a, 32b ..., 33a, 33b ..., and a detection signal of the reference footstep output from the second sensor 34, and identifies and moves a footstep having a cause of the abnormality to the installation position of the camera 36.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to an abnormality detection system for passenger conveyors such as escalators and moving walkways.

  Passenger conveyors (man conveyors) such as escalators and moving walkways include a large number of steps connected endlessly by a chain. These steps are circulated and moved by a motor drive along guide rails arranged inside the truss, so that passengers who have boarded the steps are transported from one boarding gate to the other boarding gate.

  On the left and right sides of the step, there are provided a front wheel that is pivotally supported by the chain and a rear wheel that is attached below the step-up surface (riser) of the step. These wheels (front wheels and rear wheels) are composed of rubber rollers and bearings that rotatably support the rubber rollers, and move on the guide rail.

  In the passenger conveyor having such a configuration, there is known a method of detecting the presence or absence of an abnormality by installing a vibration sensor on a step and monitoring a signal of the vibration sensor during operation.

JP 7-1333088 A Japanese Patent No. 4305342

  In the above-described method, it is necessary to install a vibration sensor for each step, and wiring for these vibration sensors becomes complicated. Even if an abnormality is detected, it is impossible to grasp what kind of abnormality has occurred until the maintenance staff actually visits the site and confirms it.

  The problem to be solved by the present invention is to provide a passenger conveyor abnormality detection system capable of grasping an abnormal state of a step during driving and appropriately dealing with it.

  An abnormality detection system for a passenger conveyor according to an embodiment has a plurality of steps, and wheels that support these steps travel along a guide rail disposed inside the truss.

  The abnormality detection system for the passenger conveyor is installed on the guide rail at regular intervals, and includes a plurality of first sensors for detecting an abnormality during travel of each step, and a reference set in advance in each step. A second sensor for detecting a step, at least one camera installed at an arbitrary position on the travel route of each step, a detection signal output from each of the first sensors, and the second sensor An information processing device that detects an abnormality based on the detection signal of the reference step output from the camera, identifies the step having the cause of the abnormality, and moves the step to the installation position of the camera.

FIG. 1 is a diagram showing an overall schematic configuration of an escalator in one embodiment. FIG. 2 is a perspective view showing the configuration of the steps of the escalator in the same embodiment. FIG. 3 is a cross-sectional view showing a configuration of a step wheel in the same embodiment. FIG. 4 is a diagram showing a configuration of the abnormality detection system in the same embodiment. FIG. 5 is a diagram showing an arrangement example of the first sensors in the same embodiment. FIG. 6 is a diagram showing another arrangement example of the first sensors in the same embodiment. FIG. 7 is a block diagram showing a functional configuration of the information processing apparatus in the embodiment. FIG. 8 is a flowchart showing the operation of the abnormality detection system in the same embodiment. FIG. 9 is a diagram for explaining a method for identifying a step having an abnormality cause in the embodiment. FIG. 10 is a diagram showing an output waveform of the vibration sensor at the time of abnormality in the embodiment. FIG. 11 is a diagram illustrating a positional relationship between the vibration sensor and the step in the embodiment.

Hereinafter, embodiments will be described with reference to the drawings.
In the following, a typical escalator will be described as an example of a passenger conveyor. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant description thereof will be simplified or omitted as appropriate.

  FIG. 1 is a diagram showing an overall schematic configuration of an escalator in one embodiment. 10 in the figure indicates the entire escalator.

  The escalator 10 is installed, for example, between the upper floor and the lower floor of a building, and circulates a number of steps (steps) 11 between the entrance / exit of the upper machine room 12 and the entrance / exit of the lower machine room 13. Move. The steps 11 are connected by endless connecting chains 14a and 14b shown in FIG. 2, and are arranged in a truss 15 installed under the floor of the building. Inside the truss 15, an upper sprocket 16 and a lower sprocket 17 are arranged, and a connecting chain 14 is wound around them.

  A driving device 18 having a motor, a speed reducer, or the like is connected to one of the upper sprocket 16 and the lower sprocket 17 (in this example, the upper sprocket 16). By driving the drive device 18, the sprockets 16, 17 are rotated, and the plurality of steps 11 are guided by the guide rails 30, 31 through the connecting chain 14 that meshes with the sprockets 16, 17. It circulates between the entrance and exit of the lower machine room 13.

  A pair of skirt guards (not shown) are installed on the truss 15 along the moving direction of the steps 11 so as to face both side surfaces of each step 11. A balustrade 19 is erected on the pair of skirt guards. A belt-like handrail 20 is mounted around the balustrade 19. The handrail 20 is a handrail gripped by a passenger boarding the step 11 and circulates in synchronization with the movement of the step 11.

FIG. 2 is a perspective view showing the configuration of the step 11 of the escalator 10.
The step 11 includes a bracket 21 having a substantially fan-shaped side surface shape, a step plate 22 provided on the upper portion of the bracket 21, and a riser 23 arranged along the arc shape of the bracket 21.

  A shaft attachment portion 24 is formed at the distal end portion of the bracket 21, and a step connecting shaft 25 is rotatably attached thereto. The step connection shafts 25 are arranged in the horizontal direction at predetermined intervals along the moving direction of the step 11. The step connection shaft 25 is engaged with the left and right connection chains 14a and 14b, and a pair of left and right wheels (hereinafter referred to as front wheels) 26a and 26b are provided at both ends thereof.

  A pair of left and right wheels (hereinafter referred to as rear wheels) 27 a and 27 b are provided on both sides of the lower end portion of the riser 23 of the bracket 21.

  A pair of guide rails 30 and 31 are disposed on the left and right sides of the step 11 along the traveling route, and are fixed in the truss 15 with bolts or the like. The guide rail 30 supports a front wheel 26 provided on the front side of the step 11, and the guide rail 31 supports a rear wheel 27 provided on the rear side of the step 11.

  FIG. 3 is a cross-sectional view showing the configuration of the wheels of the step 11. The “wheels” referred to here are a pair of front wheels 26 a and 26 b and rear wheels 27 a and 27 b provided on both sides of the step 11.

  In general, the wheel of the step 11 includes a bearing 28 that is rotatably provided at the center, and a rubber roller 29 that covers the periphery of the bearing 28. If the escalator 10 is operated for a long period of time, the wheels may not rotate smoothly due to deterioration of the rubber roller 29 or the bearing 28, and an abnormal noise may occur due to contact with the side surface of the guide rail during traveling. If the operation is continued in such a state, the rubber roller 29 may be detached from the bearing 28 and fall off.

  Usually, maintenance personnel inspect each part including the step 11 in a periodic inspection or the like. However, an operation such as stopping the operation of the escalator 10 and removing the step 11 is necessary for every inspection, and the burden on maintenance personnel is large. Moreover, since the escalator 10 cannot be used during that time, the user is inconvenienced.

  The present embodiment has been made in view of such points, and does not require maintenance personnel, and automatically detects an abnormality of the escalator 10, particularly an abnormality of the step 11, during operation, and grasps the state of the abnormality. We propose a system that can

Hereinafter, the configuration of the abnormality detection system will be described in detail.
FIG. 4 is a diagram showing the configuration of the abnormality detection system. In FIG. 4, only one step 11 is shown for the sake of convenience, but in reality, a large number of steps 11 are connected endlessly by connecting chains 14a and 14b, and these steps 11 are in the direction of the arrows. Drive to.

  A plurality of first sensors 32a, 32b,..., 33a, 33b... Are provided at a constant interval d on the back of the pair of left and right guide rails 31a, 31b provided at both ends of the step 11. As shown in FIG. 5, the distance d is the same as the distance L between the steps 11 and is, for example, 400 mm.

  The first sensors 32a, 32b..., 33a, 33b... Are sensors for detecting an abnormality while each step 11 is traveling. Specifically, the first sensors 32a, 32b,..., 33a, 33b... Are vibration sensors and are arranged 1: 1 with respect to each step 11, and the rear wheels 27a, 27b of the step 11 are located at the respective positions. Detect vibration when passing.

  If the vibration detection accuracy of the first sensors 32a, 32b,..., 33a, 33b... Is high, they may be arranged at two-step intervals as shown in FIG. If the sensor arrangement interval at this time is d ′, d ′ = 2L. With such an arrangement, the number of first sensors can be reduced.

  Furthermore, it is good also as a structure which provides 1st sensor 32a, 32b ... only in the one end side (for example, guide rail 31a) of the step 11, and detects abnormality from an output signal from these 1st sensor 32a, 32b ....

  On the other hand, a second sensor 34 for detecting a reference step is provided on one of the guide rails 31a and 31b (the right guide rail 31b in the example of FIG. 4). On the side surface of the step 11 set as the reference step, a marking 35 having reflection characteristics is provided.

  Specifically, the second sensor 34 is a reflective photoelectric sensor in which a light transmitting unit and a light receiving unit are integrated, and optically detects a reference step. Specifically, the second sensor 34 emits light toward the traveling step 11 and detects the light reflected by the marking 35 attached to the side surface of the step 11 set as the reference step.

  The first sensors 32a, 32b..., 33a, 33b... And the second sensor 34 are connected to the information processing apparatus 40, respectively. The connection form may be wired or wireless. The information processing apparatus 40 is a general-purpose computer. The information processing apparatus 40 detects an abnormality based on detection signals output in time series from the first sensors 32a, 32b,..., 33a, 33b. And a function for identifying a step having the cause of the abnormality.

  In the example of FIG. 4, the first sensors 32a, 32b,..., 33a, 33b,... Are provided on the rear wheel guide rails 31a, 31b. The sensor may be installed at regular intervals, and these may be connected to the information processing apparatus 40 by wire or wirelessly.

  However, in general, the rear wheels 27a and 27b have a larger load than the front wheels 26a and 26b and are likely to break down. Therefore, it is preferable to provide the first sensors 32a, 32b,..., 33a, 33b... On the rear wheel guide rails 31a, 31b as in the example of FIG.

  Further, for example, a camera 36 is installed near the handrail near the lower entrance. The camera 36 is used to verify the cause of the abnormality, and images the entire surface of the step 11 (the step board 22 and the riser 23) located near the installation position. The camera 36 is connected to the information processing device 40 in the same manner as the above sensors. The connection form may be wired or wireless.

  The camera 36 may be always in a shooting state, or may be appropriately activated at the timing when an abnormality is detected. Further, when a monitoring camera is installed in advance, the monitoring camera may be used as the abnormality verification camera 36.

  If the camera 36 has a zoom function, the subject to be photographed may be enlarged / reduced by controlling the zoom function by remote operation from the outside. If the camera 36 is movable, the shooting range may be changed by moving the camera 36 up and down, left and right by remote operation from the outside.

  The outside includes a portable terminal 52 held by a maintenance staff 51 to be described later, a monitoring terminal 54 installed in the monitoring center 53, and the like.

  The information processing apparatus 40 is connected to a mobile terminal 52 held by a maintenance staff 51 and a monitoring terminal 54 installed in a monitoring center 53 via a communication network 50 such as the Internet. The portable terminal 52 is a terminal device dedicated for maintenance and inspection, and has various functions for maintenance and inspection in addition to a general communication function. The maintenance staff 51 uses each portable terminal 52 to inspect each property. “Property” as used herein refers to a building where an escalator to be inspected is installed.

  The monitoring center 53 exists in a remote place, and remotely monitors the operating state of the escalator of each property via the communication network 50. Specifically, the monitoring person in the monitoring center 53 monitors the operating state of the escalator of each property through the monitoring terminal 54. If any abnormality is confirmed, the maintenance person 51 is contacted and sent to the site. deal with.

FIG. 7 is a block diagram illustrating a functional configuration of the information processing apparatus 40.
The information processing apparatus 40 includes a control unit 41, a storage unit 42, a display unit 43, and a communication unit 44. The control unit 41 includes a CPU and controls the entire apparatus. The control unit 41 includes an abnormality detection unit 41a, an operation control unit 41b, a camera control unit 41c, and a notification unit 41d as functions for realizing the present system.

  The abnormality detection unit 41a outputs detection signals that are sequentially output from the first sensors 32a, 32b,..., 33a, 33b... And the second sensor 34 when the reference steps pass. Detection signals are acquired in time series, and an abnormality is detected based on these detection signals, and the step 11 having the cause of the abnormality is specified.

  The operation control unit 41b stops the operation of the escalator 10 when an abnormality is detected, and after confirming that the user is not on the escalator 10, the operation control unit 41b operates the escalator 10 temporarily to cause the abnormality. Is moved to the installation position of the camera 36.

  The camera control unit 41c controls the photographing operation of the camera 36 in the event of an abnormality, and photographs the step 11 located near the installation position of the camera 36.

  When an abnormality is detected, the notification unit 41d sends an image captured by the camera 36 to a preset notification destination to notify that an abnormality has occurred. The notification destination includes the portable terminal 52 held by the maintenance staff 51, the monitoring terminal 54 installed in the monitoring center 53, and the like.

  The storage unit 42 stores various data necessary for the processing of the control unit 41 including a program. In the storage unit 42, data relating to abnormality detected by the first sensors 32a, 32b,..., 33a, 33b... And the second sensor 34, images of the steps 11 taken by the camera 36, and the like are recorded. .

  The display unit 43 is used when displaying an image of the step 11 taken by the camera 36. The communication unit 44 performs communication processing with the portable terminal 52 held by the maintenance staff 51 and the monitoring terminal 54 installed in the monitoring center 53.

  The operation of this system will be described below assuming that a vibration sensor is installed as the first sensor 32a, 32b,..., 33a, 33b, and a reflective photoelectric sensor is installed as the second sensor.

  FIG. 8 is a flowchart showing the operation of the abnormality detection system. Each process shown in this flowchart is executed when the control unit 41 of the information processing apparatus 40, which is a computer, reads a predetermined program.

  First, when the operation of the escalator 10 is started by operating an operation button (not shown), the plurality of steps 11 travels via the connecting chains 14a and 14b (step S11).

  At this time, the plurality of first sensors 32a, 32b,..., 33a, 33b,... Detect vibrations during stepping at the respective installation positions, and these detection signals are sequentially input to the information processing apparatus 40 (step S12). ). Further, the step 11 having the marking 35 is optically detected as a reference step by the second sensor 34, and the detection signal is input to the information processing apparatus 40 (step S13).

  Here, when a detection signal exceeding a preset reference level TH is output from any one of the first sensors 32a, 32b,..., 33a, 33b, during operation of the escalator 10 (Yes in step S14). The information processing apparatus 40 determines that some abnormality has occurred, and records the vibration data obtained at that time in the storage unit 42 (step S15).

  The reference level TH is based on a vibration level that is constantly generated during driving (for example, a vibration level that occurs when the user walks on the step 11 or a vibration level that occurs when a load is placed on the step 11). Is also set larger.

  The vibration data may be recorded by recording at least one round from when the reference level TH is exceeded, or by recording only abnormal values exceeding the reference level TH.

  Further, the information processing apparatus 40 identifies the step 11 having the cause of the abnormality (that is, the step 11 that has generated abnormal vibration), and records a number for identifying the step 11 in the storage unit 42 (step S16). . The data relating to the abnormality recorded in the storage unit 42 can be used later for analysis of the cause of the abnormality.

  A method for identifying the step 11 having the cause of abnormality will be described with reference to FIGS. 9 to 11.

  Now, as shown in FIG. 9, it is assumed that the plurality of steps 11 are circularly moved in the direction indicated by the arrows. The No. 11 step 11 having the marking 35 is a reference step and is detected by the light reflection type sensor (second sensor 34).

  Z, A, B, C, and D in the figure are vibration sensors (first sensors 32a, 32b... Or first sensors 33a, 33b...), And are attached to one of the pair of left and right guide rails 31a and 31b. It is installed at the same interval as each step 11.

  If a vibration sensor is installed on the other guide rail, the vibration state of each step 11 can be detected with high accuracy by dividing it into left and right, but here it is installed on one side for the sake of simplicity. And

  FIG. 10 is a diagram showing an output waveform of the vibration sensor at the time of abnormality. FIG. 11 is a diagram illustrating a positional relationship between the vibration sensor and the step.

  While each step 11 is traveling, the vibration sensors Z, A, B, C, and D detect vibrations at the respective installation positions. Here, it is assumed that there is a large impact on the No. 3 step 11 disposed two steps after the reference step, and a detection signal exceeding the reference level TH is output from the vibration sensor B as shown in FIG.

  First, when abnormal vibration is detected by the vibration sensor B, it is determined how far the reference step (No. 11 step 11) is from the position of the light reflection type sensor (second sensor 34). This can be determined from the elapsed time after passing through the light reflection type sensor of the reference step and the operating speed of the escalator 10 (traveling speed of the step 11). In the example of FIG. 9, it can be determined that the reference step is at the position of the vibration sensor Z.

  If the current position of the reference step is known, as shown in FIG. 11, an abnormality occurred two steps after the reference step from the relationship between the position of the vibration sensor B and the position of the reference step (in this example, the position of the vibration sensor). It can be judged. In this example, the No. 3 step 11 is two steps behind the reference step. Therefore, the No. 3 step 11 is regarded as a step having an abnormality cause (abnormal step).

  When detection signals exceeding the reference level TH are output from a plurality of vibration sensors, the steps 11 that cause an abnormality are identified from the relationship between the positions of these vibration sensors and the positions of the reference steps.

  The cause of the abnormality may be damage to the step 11 or wheel removal, but it is difficult to analyze the cause only by the vibration waveform. Therefore, when an abnormality is detected, the information processing apparatus 40 temporarily stops the operation of the escalator 10 (step S17), and confirms that there is no user through the first sensors 32a, 32b, 33a, 33b,. After that, the escalator 10 is restarted (steps S18 to S20), and the step 11 specified in step S16 is moved to the installation position of the camera 36 (step S21).

  When the identified step 11 reaches the installation position of the camera 36, the information processing apparatus 40 captures the step 11 with the camera 36 and records it in the storage unit 42 (step S22). In addition, the information processing apparatus 40 transmits an image of the step 11 taken by the camera 36 to a preset report destination to notify that an abnormality has occurred (step S23). After the abnormality is reported, the information processing apparatus 40 completely stops the operation of the escalator 10 (step S24).

  The notification destination includes the portable terminal 52 of the maintenance staff 51 shown in FIG. 4 and the monitoring terminal 54 installed in the monitoring center 53. Either one of the portable terminal 52 and the monitoring terminal 54 may be notified, or both may be notified.

  When the notification is issued to the portable terminal 52 held by the maintenance staff 51, the maintenance staff 51 determines the quality of the step 11 by looking at the image displayed on the portable terminal 52. When it is determined that the parts need to be replaced, etc., the operation is performed at the site and the parts are replaced. After confirming the safety, the operation of the escalator 10 is resumed.

  When the alarm is issued to the monitoring terminal 54 installed in the monitoring center 53, the monitoring person in the monitoring center 53 judges the quality of the step 11 by looking at the image displayed on the monitoring terminal 54, and replaces the part. When the above is necessary, the maintenance staff 51 close to the site is contacted for countermeasures.

  As described above, according to the present embodiment, when an abnormality is detected, it is possible to determine the quality of the step 11 from the photographed image by moving the step 11 having the abnormality cause to the installation position of the camera 36. it can.

  Therefore, for example, when a large vibration is generated by a user dropping a heavy object on the step 11, if it is found that there is no particular problem with the step 11 on the image, the escalator 10 is not required to be inspected by the maintenance staff 51. Can be resumed, and the burden on the maintenance staff 51 is reduced. Further, if a crack or the like of the step 11 is found on the image, the maintenance staff 51 can prepare a tool for replacing parts in advance and go to the site, and can appropriately and quickly cope with the site. .

  According to at least one embodiment described above, it is possible to provide an abnormality detection system for a passenger conveyor that can grasp an abnormal state of a step during driving and appropriately deal with it.

  In the above embodiment, a vibration sensor is assumed as the first sensor. However, for example, a sound sensor may be used. In short, any sensor may be used as long as it can detect an abnormality at each location while the step is running.

  In addition, although the reflection type photoelectric sensor is assumed as the second sensor, for example, a light transmission unit and a light receiving unit may be separate transmission type photoelectric sensors, or the reference step may be mechanically detected. .

  Moreover, the installation location of the camera 36 is not limited to one location, and another camera may be installed in the truss so as to photograph the back side of the step 11, for example.

  In addition, the information processing apparatus 40 shown in FIG. 4 is installed in a monitoring room of a building, for example, and an image of the step 11 displayed so that a worker resident in the monitoring room can visually recognize the information processing apparatus 40 is seen. You may make it perform a quality determination.

  Furthermore, although each said embodiment demonstrated the escalator as an example as a passenger conveyor, it is applicable also to a moving sidewalk.

  In short, several embodiments of the present invention have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 10 ... Escalator, 11 ... Step, 12, 13 ... Machine room, 14a, 14b ... Connection chain, 15 ... Truss, 16, 17 ... Sprocket, 18 ... Drive device, 19 ... Railing, 20 ... Hand rail, 21 ... Bracket, 22 ... Tread plate, 23 ... Riser, 24 ... Shaft mounting portion, 25 ... Step connecting shaft, 26a, 26b ... Front wheel, 27a, 27b ... Rear wheel, 28 ... Bearing, 29 ... Rubber roller, 31a, 31b ... Guide rail, 32a, 32b, 32c, 33a, 33b, 33c ... first sensor, 34 ... second sensor, 35 ... marking, 36 ... camera, 40 ... information processing device, 41 ... control unit, 41a ... abnormality detection unit, 41b ... driving Control unit 41, 41c ... Camera control unit, 41d ... Notification unit, 42 ... Storage unit, 43 ... Display unit, 44 ... Communication unit, 50 ... Communication network, 1 ... maintenance personnel, 52 ... portable terminal, 53 ... monitoring center, 54 ... monitor terminal.

Claims (11)

In a passenger conveyor abnormality detection system that has a plurality of steps and wheels that support these steps travel along a guide rail disposed in the truss,
A plurality of first sensors installed on the guide rail at regular intervals to detect abnormalities during travel of the steps;
A second sensor for detecting a preset reference step among the steps;
At least one camera installed at any location on the travel route of each step;
Installation of the camera by detecting an abnormality based on the detection signal output from each of the first sensors and the detection signal of the reference step output from the second sensor, identifying the step having the abnormality An abnormality detection system for a passenger conveyor, comprising: an information processing device that moves to a position. The information processing apparatus
A step having an abnormal cause from the relationship between the position of the sensor that outputs a detection signal exceeding a preset reference level in each of the first sensors and the position of the reference step detected by the second sensor. 2. The passenger conveyor abnormality detection system according to claim 1, wherein: The information processing apparatus
2. The identified step is moved to the installation position of the camera after confirming that the user is not on the passenger conveyor when the step having the cause of abnormality is identified. The passenger conveyor abnormality detection system described. The information processing apparatus
4. The passenger conveyor abnormality detection system according to claim 3, wherein whether or not a user is on the passenger conveyor is determined based on a detection signal output from each of the first sensors. The information processing apparatus
The passenger conveyor abnormality detection system according to claim 1, wherein an image of the step taken by the camera is displayed so as to be visible. The information processing apparatus
2. The passenger conveyor abnormality detection system according to claim 1, wherein an image of the step taken by the camera is transmitted to a preset report destination to notify that an abnormality has occurred.   7. The passenger conveyor abnormality detection system according to claim 6, wherein the notification destination includes a portable terminal held by a maintenance staff.   7. The passenger conveyor abnormality detection system according to claim 6, wherein the notification destination includes a monitoring terminal installed in a monitoring center that remotely monitors the operating state of the passenger conveyor.   2. The passenger conveyor abnormality detection system according to claim 1, wherein each of the first sensors is a vibration sensor that detects vibration during travel of each of the steps. 3.   2. The passenger conveyor abnormality detection system according to claim 1, wherein each of the first sensors is a sound sensor that detects a sound during traveling of each of the steps.   2. The passenger conveyor abnormality detection according to claim 1, wherein the second sensor is a photoelectric sensor that optically detects a marking provided on a step set as a reference step among the steps. system.

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