JP6522203B1 - Passenger conveyor anomaly detection system - Google Patents

Abstract

An object of the present invention is to grasp an abnormal state of a step during operation and appropriately cope with it. An abnormality detection system for a passenger conveyor according to one embodiment is installed at a constant interval on guide rails 31a and 31b, and detects a plurality of first sensors 32a and 32b for detecting an abnormality during traveling of each step 11. ..., 33a, 33b..., A second sensor 34 for detecting a reference step set in advance in each step 11, and at least one camera installed at an arbitrary place on the traveling path of each step 11. An abnormality is detected based on detection signals output from the first sensor 32 and the first sensors 32a, 32b, 33a, 33b and the detection signal of the reference step output from the second sensor 34, and the cause of the abnormality is detected. The information processing apparatus 40 is provided which specifies the step having and moves it to the installation position of the camera 36. [Selected figure] Figure 1

Description

  Embodiments of the present invention relate to anomaly detection systems for passenger conveyors such as escalators and moving walkways.

  Passenger conveyors (man conveyors) such as escalators and moving walkways are provided with a number of steps connected endlessly by chains. By circulating the steps by means of motor drive along the guide rails disposed inside the truss, the passengers on the steps are transported from one of the entrances to the other.

  On the left and right sides of the step, there are provided a front wheel pivotally supported by the chain and a rear wheel mounted below the riser of the step. These wheels (front and rear wheels) are composed of rubber rollers and bearings rotatably supporting the rubber rollers, and move on the guide rails.

  In the passenger conveyor of such a configuration, a method is known in which a vibration sensor is installed on the step and the signal of the vibration sensor is monitored during operation to detect the presence or absence of abnormality.

JP 7-133088 A Patent No. 4305342

  In the method described above, it is necessary to install vibration sensors on each of the steps, and wiring to these vibration sensors becomes complicated. Further, even if an abnormality is detected, it can not be grasped what kind of abnormality has occurred until a maintenance worker actually visits the site for confirmation.

  The problem to be solved by the present invention is to provide an abnormality detection system for a passenger conveyor capable of grasping and appropriately coping with an abnormal state of steps during operation.

  The abnormality detection system for a passenger conveyor according to one embodiment has a plurality of steps, and wheels supporting the steps travel along guide rails disposed inside the truss.

  The abnormality detection system for the passenger conveyor is installed at regular intervals on the guide rail, and a plurality of first sensors for detecting an abnormality during traveling of each step, and a reference set in advance among the steps. A second sensor for detecting a step, at least one camera installed at an arbitrary position on the traveling route of each step, a detection signal output from each first sensor, and the second sensor And an information processing apparatus configured to detect an abnormality based on the detection signal of the reference step output from the control unit, identify a step having the abnormality cause, and move the step to the installation position of the camera.

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

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

  FIG. 1 is a diagram showing an overall schematic configuration of an escalator according to an 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 the building at an incline, and circulates a large number of steps 11 between the entrance of the upper machine room 12 and the entrance of the lower machine room 13. Move it. Each step 11 is connected by endless connecting chains 14a and 14b shown in FIG. 2, and is disposed in a truss 15 installed under the floor of the building. An upper sprocket 16 and a lower sprocket 17 are disposed inside the truss 15, and a connecting chain 14 is wound around them.

  A drive device 18 having a motor, a reduction gear, and the like is connected to one of the upper sprocket 16 and the lower sprocket 17 (the upper sprocket 16 in this example). The driving of the drive unit 18 rotates the sprockets 16 and 17, and the plurality of steps 11 are guided by the guide rails 30 and 31 via the connecting chain 14 engaged with the sprockets 16 and 17, and the entrance and exit of the upper machine room 12 It circulates between the entrance to the lower machine room 13 and the entrance.

  Further, at the upper part of the truss 15, a pair of skirt guards (not shown) are installed 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 each of 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 on the step 11, and orbits 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. As shown in FIG.
The step 11 includes a bracket 21 having a substantially fan-shaped side shape, a tread plate 22 provided on an upper portion of the bracket 21, and a riser 23 disposed along an arc of the bracket 21.

  A shaft attachment portion 24 is formed at the tip end of the bracket 21, and the step connection shaft 25 is rotatably attached thereto. The step connecting shaft 25 is horizontally disposed at a predetermined interval along the moving direction of the steps 11. The step connecting shaft 25 is engaged with the left and right connecting 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.

  A pair of left and right wheels (hereinafter referred to as rear wheels) 27a and 27b 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 path, and fixed in the truss 15 with a bolt 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 wheel of the step 11. As shown in FIG. In addition, a "wheel" said here is a pair of front wheel 26a, 26b provided in the both sides of the step 11, and rear-wheel 27a, 27b.

  Generally, the wheel of the step 11 is composed of a bearing 28 rotatably provided at the center and a rubber roller 29 covering the circumference of the bearing 28. When the escalator 10 is operated for a long time, deterioration of the rubber roller 29 and the bearing 28 may prevent the wheels from rotating smoothly, and may contact the side surface of the guide rail during traveling to generate noise. If the operation is continued in such a state, the rubber roller 29 may come off from the bearing 28.

  Normally, maintenance personnel check each part including the step 11 by periodic inspection and the like. However, it is necessary to stop the operation of the escalator 10 and to remove the steps 11 each time the inspection is performed, which places a heavy burden on maintenance personnel. In addition, since the escalator 10 can not be used during that time, the user suffers inconvenience.

  In the present embodiment, in view of such a point, it is not necessary to have maintenance personnel to automatically detect an abnormality of the escalator 10, particularly an abnormality of the step 11 at the time of operation, and grasp a state of the abnormality. We propose a system that can

The configuration of the abnormality detection system will be described in detail below.
FIG. 4 is a diagram showing the configuration of the abnormality detection system. Although only one step 11 is shown in FIG. 4 for the sake of convenience, in practice many steps 11 are endlessly connected by the connecting chains 14a and 14b, and these steps 11 are in the direction of the arrow. It is driven by.

  A plurality of first sensors 32a, 32b, 33a, 33b,... Are provided on the back of a pair of left and right guide rails 31a, 31b provided at both ends of the step 11 at a constant interval d. 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 abnormalities while the steps 11 are 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 at respective positions. Detects vibration when passing.

  If the vibration detection accuracy of the first sensors 32a, 32b, 33a, 33b,... Is high, for example, as shown in FIG. Assuming that the sensor arrangement interval at this time is d ', d' = 2L. Such an arrangement can reduce the number of first sensors installed.

  Furthermore, the first sensors 32a, 32b,... May be provided only at one end side (for example, the guide rail 31a) of the step 11, and an abnormality may be detected from output signals from these first sensors 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 guide rail 31b on the right side in the example of FIG. 4). A marking 35 having a reflection characteristic is provided on the side surface of the step 11 set as the reference step.

  Specifically, the second sensor 34 is a reflection type 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 running 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 respectively connected to the information processing apparatus 40. The connection may be wired or wireless. The information processing apparatus 40 is formed of 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 the second sensor 34 as the steps 11 travel. , It has a function to identify the step having the cause of the abnormality.

  In the example of FIG. 4, the first sensors 32a, 32b,... 33a, 33b are provided on the guide rails 31a, 31b for the rear wheels, but the same is applied to the back of the guide rails 30a, 30b for the front wheels. The sensors may be installed at regular intervals, and these may be connected to the information processing apparatus 40 in a wired or wireless manner.

  However, in general, the load on the rear wheels 27a and 27b is larger than that on the front wheels 26a and 26b, and the rear wheels 27a and 27b are easily broken. Therefore, as in the example of FIG. 4, it is preferable to provide the first sensors 32a, 32b,... 33a, 33b... On the guide rails 31a, 31b for the rear wheel.

  Furthermore, 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 photographs the entire surface (the step board 22 and the riser 23) of the step 11 located in the vicinity of the installation position. The camera 36 is connected to the information processing apparatus 40 in the same manner as each of the above-described sensors. The connection may be wired or wireless.

  The camera 36 may be constantly in the shooting state, or may be appropriately activated at the timing when an abnormality is detected. When a surveillance camera is installed in advance, the surveillance camera may be used as the camera 36 for abnormality verification.

  If the camera 36 has a zoom function, the zoom function may be controlled by remote control from the outside to zoom in / out the object to be photographed. If the camera 36 is movable, the imaging range may be changed by moving the camera 36 vertically and horizontally by remote control from the outside.

  The outside includes a portable terminal 52 owned by a maintenance worker 51 described later, a monitoring terminal 54 installed in the monitoring center 53, and the like.

  The information processing apparatus 40 is connected to the portable terminal 52 held by the maintenance worker 51 and the monitoring terminal 54 installed in the monitoring center 53 via the communication network 50 such as the Internet. The portable terminal 52 is a terminal device dedicated to maintenance and inspection, and has various functions for maintenance and inspection in addition to general communication functions. The maintenance worker 51 uses the mobile terminal 52 to check each property. The "property" referred to here is a building where an escalator to be checked is installed.

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

FIG. 7 is a block diagram showing a functional configuration of the information processing apparatus 40. As shown in FIG.
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 sequentially output from the first sensors 32a, 32b, 33a, 33b, ... as the traveling of each step 11 and the second sensor 34 when the reference step passes. The detection signals are acquired in time series, an abnormality is detected based on these detection signals, and the steps 11 having the abnormality cause are identified.

  The operation control unit 41 b 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 41 b temporarily operates the escalator 10 and causes the abnormality. Are moved to the installation position of the camera 36.

  The camera control unit 41 c controls the photographing operation of the camera 36 when abnormal, and photographs the steps 11 positioned in the vicinity of 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 predetermined notification destination to notify that an abnormality has occurred. The notification destination includes the portable terminal 52 owned by the maintenance worker 51, the monitoring terminal 54 installed in the monitoring center 53, and the like.

  The storage unit 42 stores various data necessary for processing of the control unit 41, including a program. In the storage unit 42, data relating to an abnormality detected by the first sensors 32a, 32b,... 33a, 33b... And the second sensor 34, an image of the step 11 taken by the camera 36, etc. .

  The display unit 43 is used, for example, to display the image of the step 11 photographed by the camera 36. The communication unit 44 performs communication processing with the portable terminal 52 owned by the maintenance worker 51 and the monitoring terminal 54 installed in the monitoring center 53.

  The operation of this system will be described below on the assumption that vibration sensors as the first sensors 32a, 32b,..., 33a, 33b,... And reflection type photoelectric sensors as the second sensor 34 are installed.

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

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

  At this time, the plurality of first sensors 32a, 32b,..., 33a, 33b,... Detect vibrations during step travel at their 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 the reference step by the second sensor 34, and the detection signal is input to the information processing device 40 (step S13).

  Here, when a detection signal exceeding a preset reference level TH is output from any 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 refers to a vibration level that occurs constantly during driving (for example, a vibration level that occurs when a user walks on the steps 11 or a vibration level that occurs when a load is placed on the steps 11) Is also set large.

  Note that the vibration data may be recorded at least one turn since the time when the reference level TH is exceeded, or only an abnormal value which exceeds the reference level TH may be recorded.

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

  A method of specifying the steps 11 having the cause of abnormality will be described using FIGS. 9 to 11.

  Now, as shown in FIG. 9, it is assumed that the plurality of steps 11 circulate in the direction indicated by the arrow. The step 11 of No. 1 having the marking 35 is a reference step and is detected by the light reflection type sensor (second sensor 34).

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

  In addition, if a vibration sensor is installed also in the other guide rail, the vibration state of each step 11 can be divided into right and left and detected with high accuracy, but in order to simplify the explanation here, it is installed on one side I assume.

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

  During traveling of each step 11, the vibration sensors Z, A, B, C, D detect vibrations at their respective installation positions. Here, it is assumed that there is a large impact on the No. 3 step 11 disposed two steps behind the reference step, and as shown in FIG. 10, the vibration sensor B outputs a detection signal exceeding the reference level TH.

  First, when an abnormal vibration is detected by the vibration sensor B, it is determined how far away from the position of the light reflection type sensor (the second sensor 34) the reference step (the step 11 of No1) is. This can be determined from the elapsed time after passing through the light reflection type sensor of the reference step and the operation 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 error occurs behind the second step from the relationship between the position of the vibration sensor B and the position of the reference step (the position of the vibration sensor in this example). It can be judged as a thing. In this example, two steps behind the reference step are steps 11 of No3. Therefore, this No. 3 step 11 is regarded as a step having an abnormality cause (abnormal step).

  In addition, when the detection signal exceeding reference level TH is output from several vibration sensors, the step 11 used as the cause of abnormality is each specified from the relationship of the position of these vibration sensors and the position of a reference step.

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

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

  The notification destination includes the mobile terminal 52 owned by the maintenance worker 51 shown in FIG. 4 and the monitoring terminal 54 installed in the monitoring center 53. The notification may be issued to one of the portable terminal 52 and the monitoring terminal 54, or may be issued to both.

  When a notification is issued to the portable terminal 52 possessed by the maintenance worker 51, the maintenance worker 51 looks at the image displayed on the portable terminal 52 and determines whether the step 11 is good or bad. If it is determined that the parts need to be replaced, it goes to the site to perform the work such as the parts replacement, and after confirming the safety, the operation of the escalator 10 is restarted.

  When a signal is issued to the monitoring terminal 54 installed in the monitoring center 53, the monitoring staff in the monitoring center 53 checks the image displayed on the monitoring terminal 54 to judge the quality of the step 11 and replace the parts. If you need to, etc., contact maintenance staff 51 near the site to deal with it.

  As described above, according to the present embodiment, when abnormality is detected, the quality of the step 11 can be judged 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 the user drops a heavy object onto the steps 11 or the like, and a large vibration occurs, if it is known that there is no particular problem with the steps 11 on the image, the escalator 10 does not need inspection. Operation can be resumed, and the burden on maintenance personnel 51 is reduced. Further, if a crack or the like of the step 11 is found on the image, the maintenance worker 51 can prepare in advance a tool or the like for part replacement and go to the site, and can appropriately and promptly cope with the site. .

  According to at least one embodiment described above, it is possible to provide a passenger conveyor abnormality detection system capable of grasping and appropriately coping with an abnormal state of a step during operation.

  In addition, although the vibration sensor was assumed as a 1st sensor in the said embodiment, you may use a sound sensor, for example. The point is that any sensor can be used as long as it can detect an abnormality in each part while the step is traveling.

  Further, although the reflection type photoelectric sensor is assumed as the second sensor, for example, a transmission type photoelectric sensor may be used in which the traveling light portion and the light receiving portion are separate bodies, or the reference step may be detected mechanically. .

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

  Further, the information processing apparatus 40 shown in FIG. 4 is installed in, for example, a monitoring room of a building, and a worker who is resident in the monitoring room looks at the image of the steps 11 displayed visibly on the information processing apparatus 40 You may make it perform quality determination.

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

  In summary, although several embodiments of the present invention have been described, 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, substitutions, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and the 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 ... Connecting chain, 15 ... Truss, 16, 17 ... Sprocket, 18 ... Drive device, 19 ... Barrage, 20 ... Handrail, 21 ... Bracket, 22: tread plate, 23: riser, 24: shaft mounting portion, 25: step coupling 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 processor 41: controller 41a: abnormality detector 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 an abnormality detection system of a passenger conveyor having a plurality of steps, and a wheel supporting the steps travels along a guide rail disposed inside the truss,
A plurality of first sensors installed at constant intervals on the guide rail and detecting an abnormality during traveling of each step;
A second sensor that detects a preset reference step among the steps;
At least one camera installed at any place on the travel route of each step;
An abnormality is detected 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, and the step having the abnormality cause is identified to install the camera. What is claimed is: 1. An abnormality detection system for a passenger conveyor, comprising: an information processing device for moving to a position. The above information processing apparatus is
A step having an abnormality cause from the relationship between the position of the sensor that has output a detection signal exceeding a reference level set in advance among the first sensors and the position of the reference step detected by the second sensor The abnormality detection system for a passenger conveyor according to claim 1, wherein: The above information processing apparatus is
When the step having the abnormality cause is identified, after confirming that the user is not on the passenger conveyor, the identified step is moved to the installation position of the camera. Abnormality detection system for passenger conveyors as described. The above information processing apparatus is
4. The passenger conveyor abnormality detection system according to claim 3, wherein it is determined whether or not the user is on the passenger conveyor based on detection signals output from the first sensors. The above information processing apparatus is
The passenger conveyor abnormality detection system according to claim 1, wherein the image of the step taken by the camera is visibly displayed. The above information processing apparatus is
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 predetermined reporting destination to notify that an abnormality has occurred.   The abnormality detection system for a passenger conveyor according to claim 6, wherein the notification destination includes a portable terminal owned by a maintenance worker.   The abnormality detection system for a passenger conveyor according to claim 6, wherein the notification destination includes a monitoring terminal installed in a monitoring center that remotely monitors an operation 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 traveling of each step.   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 step.   2. The abnormality detection of the passenger conveyor according to claim 1, wherein the second sensor is a photoelectric sensor which optically detects a marking provided on a step set as a reference step among the steps. system.

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