JP7362562B2 - Passenger conveyor chain stretch detection device - Google Patents

Description

Embodiments of the present invention relate to a chain elongation detection device for a passenger conveyor.

Conventionally, in a passenger conveyor, a plurality of steps are connected endlessly by a step chain. The step chain is driven by the drive of the motor connected via the sprocket, the drive chain, and the speed reducer, and the steps are moved around (circulation). The moving handrail is also driven by a handrail belt drive chain. These chains develop elongation after years of use. If the chain becomes stretched (loose) in this way, the engagement between the chain and the sprocket will deteriorate.

Japanese Patent Application Publication No. 2010-149970

Therefore, it is necessary to perform maintenance and inspection work to check whether or not the chain is stretched. To check whether or not the chain is stretched, a worker must go to the site and directly measure the amount of deformation when the chain is pushed or pulled, and the dimensions between the chain rollers that make up the chain using calipers. This was done by measurement, and chain elongation could not be detected remotely.

The present embodiment aims to provide a chain elongation detection device for a passenger conveyor that can accurately detect chain elongation even remotely.

The chain elongation detection device for a passenger conveyor according to an embodiment detects a plurality of teeth that rotate together with the rotation of one sprocket of a pair of sprockets around which a chain is stretched, and determines the first rotation. a first sensor unit that outputs a detection signal; a second sensor unit that detects a plurality of teeth that rotate together with the rotation of the other sprocket regarding the rotation state of the other sprocket and outputs a second rotation detection signal; The control unit includes a control unit that detects elongation of the chain based on a difference between the phase of the one rotation detection signal and the phase of the second rotation detection signal.

FIG. 1 is a diagram showing a schematic configuration example of an escalator to which a chain elongation detection device according to an embodiment is applied. FIG. 2 is a schematic block diagram of the escalator control system. FIG. 3 is an explanatory diagram of main parts of the chain elongation detection device of the first embodiment. FIG. 4 is an explanatory diagram of the elongation detection principle of the embodiment. FIG. 5 is an operation flowchart of the embodiment. FIG. 6 is an explanatory diagram of main parts of a chain elongation detection device according to a second embodiment.

The present invention will be described in detail below with reference to the drawings. Note that the embodiments described below are merely examples, and the scope of the invention is not limited thereto. Furthermore, the components in the embodiments described below include those that can be easily imagined by those skilled in the art or those that are substantially the same.

FIG. 1 is a diagram showing a schematic configuration example of an escalator to which a chain elongation detection device according to an embodiment is applied.
In this embodiment, an escalator 100 will be described as an example of a passenger conveyor that operates by moving a plurality of steps connected in an endless manner.

An escalator chain elongation detection device (hereinafter simply referred to as chain elongation detection device) 10 according to the embodiment is installed on an escalator 100, as shown in FIG. The escalator 100 is installed in a building (also referred to as a building), and includes one floor (hereinafter referred to as the lower floor) of this building and other floors above the lower floor (hereinafter referred to as upper floors). ) to transport passengers, etc.

The escalator 100 includes a truss (structural frame) 110, a plurality of steps 120, and a handrail 130. A frame (not shown) and a drive mechanism for the escalator 100 are disposed inside the truss 110.

The drive mechanism of the escalator 100 includes a motor 105 as a drive source, a reducer 106, a drive chain 112, a drive wheel (sprocket) 113, a driven wheel (sprocket) 114, and a step chain 115. It is equipped with

The motor 105 is provided on the upper floor side of the escalator 100. A speed reducer 106 is attached to the output shaft of the motor 105.
The drive chain 112 is formed in an endless shape, and extends across the drive sprocket 111 and the driven sprocket 113 of the reduction gear 106 . The drive chain 112 rotates the driven sprocket 113 by circulating around the driven sprocket 113 and the drive sprocket 111 of the speed reducer 106 by the driving force of the motor 105 transmitted through the speed reducer 106. That is, the drive chain 112 transmits the driving force of the motor 105 transmitted via the reduction gear 106 to the driven sprocket 113.

By driving the driven sprocket 113, the escalator 100 drives the step chain 115 that is stretched between the driven sprocket 113 and the driven wheel 114, and moves the plurality of steps 120 connected in an endless manner in circles. Operate.

When the escalator 100 operates in the downward direction, at the upper entrance (upper floor side entrance/exit 101), among the plurality of steps 120, adjacent steps 120 in the direction of travel are horizontal and advance from inside the truss 110. be done. Then, in the upper transition curve, the step difference between adjacent steps 120 is enlarged, and the plurality of steps 120 are transitioned into a step-like shape. Then, at the intermediate tilting portion, the plurality of steps 120 are lowered in a step-like manner.

Then, in the lower transition curve, the step difference between adjacent steps 120 is reduced, and the plurality of steps 120 are transitioned horizontally. Then, at the lower exit (lower floor side entrance/exit 102), the plurality of steps 120 become horizontal again and enter the truss 110. After the plurality of steps 120 enter the truss 110, they are turned upward and raised horizontally on the return side. Then, the plurality of steps 120 are reversed again and advanced from inside the truss 110 at the upper floor side entrance/exit 101.

When the escalator 100 operates in the upward direction, the above operation is reversed.
In this way, at the upper floor entrance/exit 101 and the lower floor entrance/exit 102, the steps 120 advance from or into the truss 110 with the upper tread surface on which the user gets on the horizontal surface. .

The escalator 100 includes a pair of handrails 130 on both sides of the plurality of steps 120 in the traveling direction. The parapet 130 mainly includes a skirt guard panel (not shown), an inner deck 131, glass 132, and a handrail belt 133.

The skirt guard panels are adjacent to each other on both sides in a direction (width direction) perpendicular to the running direction of the plurality of steps 120 (the descending direction and ascending direction in which the escalator 100 operates), and are adjacent to the upper floor entrance 101. It is provided across from the lower floor side entrance/exit 102.

An inner deck 131 is attached to the upper side of the skirt guard panel. A glass 132 is attached to the upper side of the inner deck 131. A handrail belt 133 is movably fitted into a handrail rail (not shown) attached to the outer periphery of the glass 132. The escalator 100 is configured such that a handrail belt 133 of a handrail 130 moves around by a handrail belt drive chain (not shown) in accordance with the progress and direction of movement of the plurality of steps 120.

In this way, the escalator 100 uses three chains: the drive chain 112, the step chain 115, and the handrail belt drive chain (not shown). The drive chain 112, the step chain 115, and the handrail belt drive chain are determined to be normal if the swing width (deformation amount) is less than a reference value of X mm (for example, several tens of mm) when the central portion is bent. are provided for each.

In other words, when the swing width is larger than X mm, the drive chain 112, the step chain 115, and the handrail belt drive chain are stretched, and it is determined that they are abnormal.
When the chain is stretched in this way, a shift occurs in the rotation start timing of the sprocket around which the chain is stretched.

For example, in the case of the drive chain 112, the drive sprocket 111, which functions as a drive sprocket, and the driven sprocket 113, which functions as a driven sprocket, are switched from the stopped state to the operating state (rotating state). A shift occurs between the rotation start timing of the sprocket 111 and the rotation start timing of the driven sprocket 113, which is a driven sprocket, depending on the elongation of the drive chain.
Therefore, when the rotation start timing deviation exceeds a predetermined reference time, it can be determined that the corresponding chain has elongated by a predetermined reference amount or more.

In the following, this embodiment will be described using an example in which elongation of the drive chain 112 is detected.

Such operation of the escalator 100 is realized by controlling the speed reducer 106 and the motor 105 by a control panel (control device) 200 installed in the truss 110.
The control panel 200 is physically a computer having a CPU, RAM, ROM, and the like. The function of the control panel 200 is to operate various devices in the escalator 100 under the control of the CPU by loading an application program held in the ROM into the RAM and executing it on the CPU, and also to operate the various devices in the escalator 100 under the control of the CPU. This is achieved by reading and writing.

FIG. 2 is a schematic block diagram of the escalator control system.
As shown in FIG. 2, the control panel 200 of the escalator 100 is connected to the chain elongation detection device 10 and the remote monitoring device 300 provided remotely of the escalator 100 so as to be able to communicate with each other. Send and receive signals.

The control panel 200 drives and controls the escalator 100 by controlling the movement start/stop of the steps 120, the movement speed, etc.
The control panel 200 includes a control section 201, a control storage section 202, and a communication section 203. Here, the control panel 200 can perform drive control of the escalator 100 based on instructions from the remote monitoring device 300 input via the communication unit 203. That is, the escalator 100 can be remotely controlled by the remote monitoring device 300.

When the control unit 201 receives a detection signal related to the distance detection state of the first sensor unit 11 and the second sensor unit 12 from the control unit 13 of the chain elongation detection device 10, that is, the chain elongation, the control unit 201 stores the information in the control storage unit 202. Performs control to store detection history information regarding chain elongation. Furthermore, when the control unit 201 receives the detection signal, it controls the remote monitoring device 300 to transmit notification data of the detection state regarding chain elongation.

The control storage unit 202 is a storage device, and stores the distance detection state of the detection signal related to chain elongation received from the control unit 201, control state information of the control unit 13, and the like. Specifically, the control storage unit 202 stores information such as operation time, distance detection states of the first sensor unit 11 and the second sensor unit 12, and identification information for identifying the first sensor unit 11 and the second sensor unit 12. The information is stored as operation history information of the first sensor unit 11 and the second sensor unit 12. Further, the control storage unit 202 stores the control time and control state (including various operation detection states) of the control unit 13 as control history information.
The communication unit 203 controls communication with the remote monitoring device 300.

The remote monitoring device 300 is installed, for example, in a remote monitoring center remote from the escalator 100.
The remote monitoring device 300 is connected to the control panel 200 via the communication unit 303 so as to be able to communicate with each other, and collects detection data corresponding to detection signals in the control panel 200, control history data, and for controlling the control panel 200 and the escalator 100. Send and receive control data.
In the remote monitoring device 300, a supervisor remotely monitors each part of the escalator 100 through a remote monitoring panel (not shown). As shown in FIG. 2, the remote monitoring device 300 includes a control section 301, a monitoring storage section 302, a communication section 303, and an alarm unit 304.

The control unit 301 detects from the alarm unit 304 that the drive chain 112 is stretched, based on a control signal related to the distance detection state of the first sensor unit 11 and the second sensor unit 12 received from the control panel 200. Control is performed to make a notification, and control is performed to store detection history information of the first sensor unit 11 and the second sensor unit 12 in the monitoring storage section 302.

The monitoring storage unit 302 is a storage device, and stores the distance detection states of the first sensor unit 11 and the second sensor unit 12 received from the control unit 301 as detection history information of the first sensor unit 11 and the second sensor unit 12. Remember. Furthermore, the monitoring storage unit 302 stores contact information including a telephone number, fax number, and e-mail address for each supervisor as supervisor contact information.
The communication unit 303 controls communication with the control panel 200.

The alarm unit 304 includes, for example, a speaker, an alarm, a warning light, and communication equipment including a telephone, fax, and e-mail. The alarm unit 304 is for notifying a supervisor that the drive chain 112 is stretched. Based on the control signal from the control unit 301, the alarm unit 304 outputs sound from a speaker or an alarm device, turns on a warning light, or sends pre-stored supervisor contact information via a communication device, for example. Make announcements based on information.

The chain elongation detection device 10 of this embodiment detects the elongation of the chain of the escalator 100, specifically, the drive chain 112, as shown in FIG.
The chain elongation detection device 10 is broadly divided into a first sensor unit 11, a second sensor unit 12, a control section 13, and an alarm unit 14.

In the above configuration, when the escalator 100 is in operation, the first sensor unit 11 detects the passing timing of the teeth of the drive sprocket 111 and outputs the first detection pulse signal SG1 as the first detection signal.
The second sensor unit 12 detects the passage timing of the teeth of the driven sprocket 113 when the escalator 100 is in operation, and outputs a second detection pulse signal SG2 as a second detection signal.
In this case, as the first sensor unit 11 and the second sensor unit 12, a transmission type photoelectric sensor, a reflection type photoelectric sensor, a proximity sensor, etc. can be used.

The control unit 13 is configured as a so-called microcomputer, and based on the first detection pulse signal SG1 outputted by the first sensor unit 11 and the second detection pulse signal SG2 outputted by the second sensor unit 12, according to a control program. , detects whether or not the elongation of the drive chain 112 is greater than a predetermined reference value, and notifies the control unit 201 of the control panel 200 of the detected state, and the elongation of the drive chain 112 that is greater than the predetermined reference value is detected. If so, the alarm unit 14 is controlled to output an alarm.

The alarm unit 14 performs an alarm process under the control of the control unit 13 when the drive chain 112 has elongated by a predetermined reference value or more.

[1] First Embodiment FIG. 3 is an explanatory diagram of main parts of a chain elongation detection device according to a first embodiment.
The chain elongation detection device 10 of the first embodiment includes a first sensor unit 11 and a second sensor unit 12, as shown in FIG.

In this case, the first sensor unit 11 is provided to detect the rotation of the teeth of the driving sprocket 111 which is the driving sprocket, and the second sensor unit 12 is provided to detect the rotation of the teeth of the driven sprocket 113 which is the driven sprocket. They are each fixed via a fixing jig (not shown).

In the above configuration, as the teeth of the drive sprocket 111 rotate, the first sensor unit 11 outputs the first pulse signal SG1 (see FIG. 4) with a pulse number corresponding to the rotational state of the teeth.
On the other hand, as the teeth of the driven sprocket 113 rotate, the second sensor unit 12 outputs a second pulse signal SG2 (see FIG. 4) with the number of pulses depending on the rotational state of the teeth.

Then, when the driving sprocket 111 and the driven sprocket 113 transition from the stopped state to the rotating state, the first sensor unit 11 and the second sensor unit 12 each send a pulse signal (first pulse signal SG1 , starts outputting the second pulse signal SG2).

Therefore, when the difference between the pulse output start timing in the first pulse signal SG1 and the pulse output start timing in the second pulse signal SG2 becomes equal to or more than a predetermined reference time, the control unit 13 controls the drive sprocket 111 This means that it is possible to detect that the drive chain 112, which is stretched between the drive sprocket 113 and the driven sprocket 113, has elongated by a predetermined reference amount or more.

Further, even in a steady rotation state, a predetermined phase difference corresponding to the elongation of the drive chain 112 is maintained between the phase of the first pulse signal SG1 and the phase of the second pulse signal SG2.

The alarm unit 14 performs an alarm process under the control of the control unit 13 when the drive chain 112 has elongated by a predetermined reference value or more.

Next, the elongation detection principle of the embodiment will be explained.
FIG. 4 is an explanatory diagram of the elongation detection principle of the embodiment.
When the escalator 100 is started and the motor 105 is started, the driving force of the motor 105 causes the drive chain 112 to start circulating around the driven sprocket 113 and the drive sprocket 111 of the reducer 106.
At this time, the driving sprocket 111 starts rotating before the driven sprocket 113 because the driving force of the motor 105 is transmitted through the reducer 106 .
As a result, as shown in FIG. 4, the first pulse of the first pulse signal SG1, which is the pulse signal output by the first sensor unit 11, is output to the control section 13 at time t1.

Furthermore, the driving force of the motor 105 is transmitted to the driven sprocket 113 via the drive chain 112 as the teeth of the drive sprocket 111 rotate.

As a result, the driven sprocket 113 also starts rotating at the time when the elongation of the drive chain stretched between the driving sprocket 111 and the driven sprocket 113 is absorbed.
Then, as shown in FIG. 4, the first pulse of the second pulse signal SG2, which is the pulse signal output by the second sensor unit 12, is output to the control section 13 at time t2.
As a result, the control unit 13 calculates the time difference Δθ between the time t1, which is the pulse output start timing of the first pulse signal SG1, and the time t2, which is the pulse output start timing of the second pulse signal SG2, as a phase difference. and will be detected.

By the way, as mentioned above, if the difference between the pulse output start timing in the first pulse signal SG1 and the pulse output start timing in the second pulse signal SG2 becomes a predetermined reference time or more, the teeth of the sprocket The control unit 13 controls the sprocket between the driving sprocket 111 and the driven sprocket 113, except when the Since it is determined that the passed drive chain 112 has elongated by a predetermined reference amount or more, the time difference Δθr corresponding to the predetermined reference time is compared with the time difference Δθ.

In the case of the example in FIG. 4, since the time difference Δθ<time difference Δθr, the control unit 13 causes the drive chain 112, which is stretched between the drive sprocket 111 and the driven sprocket 113, to elongate by a predetermined reference amount or more. It is determined that this has not occurred.
On the other hand, when the time difference Δθ≧time difference Δθr, the control unit 13 determines that the drive chain 112 stretched between the drive sprocket 111 and the driven sprocket 113 has elongated by a predetermined reference amount or more. It is determined that the

As described above, according to the first embodiment, chain elongation can be easily detected by simply detecting a difference in the rotation start timing of a pair of sprockets around which a chain is stretched. can do.

Next, the operation of the first embodiment will be explained.
FIG. 5 is an operation flowchart of the embodiment.
In the following description, the chain elongation detection device 10 of the first embodiment shown in FIG. 3 will be described as an example. Furthermore, in the operation of the drive chain, the driven sprocket 113 functions as a driven wheel with respect to the driving sprocket 111 that functions as a driving wheel.
In this state, it is assumed that power is being supplied to the escalator 100.
First, the control unit 201 of the control panel 200 detects whether the key switch is on or not (step S11), and if the key switch is still in the off state (step S11; No), the control unit 201 enters the standby state. Become.

In the determination in step S11, if the key switch is turned on (step S11; Yes), the escalator is driven (step S12).
Subsequently, the control unit 13 of the chain elongation detection device 10 detects the first pulse signal SG1 output from the first sensor unit 11 (step S13), and detects the pulse of the first pulse signal SG1 from the first sensor unit 11. The output timing, that is, the rotation start timing of the drive sprocket 111 (time t1 in FIG. 4) is detected.
Next, the control unit 13 detects the second pulse signal SG2 outputted by the second sensor unit 12 (step S14), and determines the output timing of the rotation pulse of the second pulse signal SG2 from the second sensor unit 12, that is, The rotation start timing of the driven sprocket 113 (time t2 in FIG. 4) is detected.

Then, the control unit 13 calculates the time difference Δθ between the time t1, which is the pulse output start timing of the first pulse signal SG1, and the time t2, which is the pulse output start timing of the second pulse signal SG2, as a phase difference, It is stored as a calculation history, and it is determined whether the phase difference is greater than or equal to a phase difference (time difference) Δθr corresponding to a predetermined reference time (step S15).

In the determination in step S15, if the phase difference Δθ<phase difference Δθr (step S15; No), the control unit 13 controls the drive chain 112 that is stretched between the drive sprocket 111 and the driven sprocket 113. , it is determined that no elongation exceeding a predetermined reference amount has occurred, and the process returns to step S12, whereupon the same process is repeated.
Further, in the judgment in step S15, if the time difference Δθ≧time difference Δθr, the control unit 13 controls the drive chain 112, which is stretched between the drive sprocket 111 and the driven sprocket 113, by a predetermined reference amount or more. It is determined that an elongation has occurred, and the alarm unit 14 is controlled to output an alarm (step S16).

Subsequently, the control unit 13 notifies the control unit 201 of the control panel 200 of the abnormality (step S17), and notifies the history stored in the process of step S15 (step S18). Thereafter, an escalator stop process is performed and the process ends (step S19).

In this case, the escalator stop processing is performed by issuing an alarm via the alarm unit 14 and slowly stopping the drive of the motor 105.
Thereafter, an operator or a remote monitor determines that the drive chain 112 is stretched, and the drive chain 112 is repaired or replaced.

In the above explanation, the elongation of the drive chain 112 is detected at the start of driving the escalator, but the rotation reference positions of the drive sprocket 111 as a drive sprocket and the driven sprocket 113 as a driven sprocket are set in advance, It is also possible to continuously detect the phase difference between these rotational reference positions and similarly detect elongation of the drive chain 112.
With this configuration, even if the drive chain 112 suddenly stretches for some reason, it is possible to deal with it in the same way.

As described above, according to the passenger conveyor chain elongation detection device 10 according to the first embodiment, the elongation of the drive chain 112 causes a difference between the rotation of the teeth of the drive sprocket 111 and the rotation of the teeth of the driven sprocket 113. When the phase difference (or the detection time difference between the predetermined rotation reference position) becomes larger than the predetermined phase difference (or time difference), it is determined that elongation has been detected, and the alarm unit of the chain elongation detection device 10 performs an alarm process. , the alarm unit 304 of the remote monitoring device 300 may issue a notification.
Furthermore, according to the chain elongation detection device 10 according to the first embodiment, the first sensor unit 11 or the second sensor Detection history information of the unit 12 can be stored.
As described above, according to the passenger conveyor chain elongation detection device 10 of the present embodiment, elongation of the drive chain 112 can be accurately detected and reported, and the detection history of the first sensor unit 11 and the second sensor unit 12 can be checked. That is, it is possible to record time-series changes in the elongation that occurs in the drive chain 112.

In this way, according to the chain elongation detection device 10 according to the first embodiment, the elongation of the chain of the escalator 100 can be accurately detected remotely.

In the first embodiment, the first sensor unit 11 and the second sensor unit 12 are used as the drive timing detecting section, but a reflective optical sensor or a transmissive optical sensor is used to detect the rotation of the object to be detected. The same application is possible by detecting the rotational position of the sprocket.

[2] Second Embodiment FIG. 6 is an explanatory diagram of main parts of a chain elongation detection device according to a second embodiment.
The second embodiment is different from the first embodiment in that it is configured to detect the rotation of the teeth of a disk-shaped detection piece that rotates integrally with the sprocket, rather than detecting the rotation of the teeth of the sprocket. It is a point.
According to this, no load is applied to the detection piece, reducing the possibility of tooth chipping, improving maintainability, and placing the detection piece at a certain distance from the sprocket. Therefore, the effects of oil stains and the like can be reduced.

The chain elongation detection device 10 of the embodiment includes a first sensor unit 11 and a second sensor unit 12, as shown in FIG .

In this case, the first sensor unit 11 is provided so as to detect the rotation of the teeth of a disc-shaped detection piece 21 having a plurality of teeth that rotates together with the drive sprocket 111, and Fixed.

Further, the second sensor unit 12 is provided to detect the rotation of the teeth of a disc-shaped detection piece 22 having a plurality of teeth that rotates together with the driven sprocket 113, and is fixed via a fixing jig (not shown). has been done.

In the above configuration, as the teeth of the detection piece 21 rotate, the first sensor unit 11 outputs the first pulse signal SG1 with the number of pulses depending on the rotational state of the teeth.
On the other hand, the second sensor unit 12 outputs the second pulse signal SG2 with the number of pulses depending on the rotational state of the teeth as the teeth of the subordinate detection piece 22 rotate.

Then, when the driving sprocket 111 and the driven sprocket 113 transition from the stopped state to the rotating state, the first sensor unit 11 and the second sensor unit 12 each receive a pulse signal as the detection pieces 21 and 22 start rotating. The output of (first pulse signal SG1, second pulse signal SG2) is started.

Therefore, when the difference between the pulse output start timing in the first pulse signal SG1 and the pulse output start timing in the second pulse signal SG2 becomes equal to or more than a predetermined reference time, the control unit 13 controls the drive sprocket 111 This means that it is possible to detect that the drive chain 112, which is stretched between the drive sprocket 113 and the driven sprocket 113, has elongated by a predetermined reference amount or more.

As described above, according to the chain elongation detection device 10 according to the second embodiment, the elongation of the chain of the escalator 100 can be accurately detected remotely, and it is possible to improve maintainability and measurement accuracy. I can do it.

[3] Modification of Embodiment In addition, in the above embodiment, a case has been described in which the elongation of the drive chain 112 is detected. It is also possible to configure Thereby, the chain elongation detection device 10 can accurately detect elongation of various chains disposed on the escalator 100.

In the above-mentioned embodiment, the escalator 100 was described as an example of a passenger conveyor in which a plurality of steps 120 connected in an endless manner operate in a circular motion, but the present embodiment is not limited to the escalator 100. It can be applied to other types of passenger conveyors as well, such as moving walkways.

The above embodiments and modifications can be combined without departing from the gist of the invention.

Although some embodiments and modifications of the present invention have been described, these embodiments and modifications are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included within the scope and gist of the invention as well as within the scope of the invention described in the claims and its equivalents.

DESCRIPTION OF SYMBOLS 10... Detection device, 11... First sensor unit, 12... Second sensor unit, 13... Control section, 14... Alarm unit, 21... First detection piece, 22... Second detection piece, 100... Escalator (passenger conveyor) , 105... Motor, 106... Reducer, 111... Sprocket (driving sprocket), 112... Drive chain, 113... Drive wheel (driven sprocket), 114... Driven wheel, 115... Step chain, 120... Step, 200... Control panel , 201...Control unit, 202...Control storage unit, 203...Communication unit, 300...Remote monitoring device, 301...Control unit, 302...Notification unit, 302...Monitoring storage unit, 303...Communication unit, 304...Alarm unit .

Claims (5)

a first sensor unit that detects the rotational state of one of the pair of sprockets around which the chain is stretched, and outputs a first rotation detection signal;
a second sensor unit that detects the rotational state of the other sprocket and outputs a second rotation detection signal;
a control unit that detects elongation of the chain based on a difference between a phase of the first rotation detection signal and a phase of the second rotation detection signal;
Equipped with
A disk-shaped first detection piece having a plurality of teeth that rotates together with the one sprocket is attached to the one sprocket,
A second disc-shaped detection piece having a plurality of teeth that rotates together with the other sprocket is attached to the other sprocket,
The first detection piece and the second detection piece have mutually corresponding rotation reference positions set in advance, and
The first sensor unit is provided inside a ring constituted by the chain so as to detect a rotation reference position of the first detection side, and the first sensor unit is arranged to detect a rotation reference position of the first detection side, and is arranged to detect a rotation reference position of the first detection side of the sprocket. detecting the rotation state of teeth of the first detection piece located nearby and outputting the first rotation detection signal;
The second sensor unit is provided inside a ring formed by the chain so as to detect the rotation reference position of the second detection side, and the second sensor unit is arranged to detect a rotation reference position of the second detection side of the second sprocket. detecting the rotation state of teeth of the second detection piece located nearby and outputting the second rotation detection signal;
The control unit sets the time difference between the timing of output start of the first rotation detection signal and the output start timing of the second rotation detection signal as a phase difference, and when the phase difference exceeds a predetermined reference phase difference. It is determined that the chain has elongated beyond a predetermined reference value.
Passenger conveyor chain stretch detection device. a first sensor unit that detects the rotational state of one of the pair of sprockets around which the chain is stretched, and outputs a first rotation detection signal;
a second sensor unit that detects the rotational state of the other sprocket and outputs a second rotation detection signal;
a control unit that detects elongation of the chain based on a difference between a phase of the first rotation detection signal and a phase of the second rotation detection signal;
Equipped with
The one sprocket and the other sprocket have mutually corresponding rotation reference positions set in advance,
The first sensor unit is provided inside a ring formed by the chain to detect a rotation reference position on the one sprocket side, and the first sensor unit is arranged to detect a rotation reference position on the one sprocket side. detecting the rotational state of the teeth and outputting the first rotation detection signal;
The second sensor unit is provided inside a ring constituted by the chain to detect a rotation reference position on the other sprocket side, and the second sensor unit is arranged to detect a rotation reference position on the other sprocket side. detecting the rotation state of the teeth and outputting the second rotation detection signal;
The control unit sets the time difference between the timing of output start of the first rotation detection signal and the output start timing of the second rotation detection signal as a phase difference, and when the phase difference exceeds a predetermined reference phase difference. It is determined that the chain has elongated beyond a predetermined reference value.
Passenger conveyor chain stretch detection device. The one sprocket is a driving sprocket, and the other sprocket is a driven sprocket driven by the operation of the driving sprocket.
A chain elongation detection device for a passenger conveyor according to claim 1 or 2. The control unit calculates the phase difference when the drive sprocket transitions from a stopped state to an operating state.
The chain elongation detection device for a passenger conveyor according to claim 3. The first sensor unit and the second sensor unit include a proximity sensor or an optical sensor.
A chain elongation detection device for a passenger conveyor according to any one of claims 1 to 4.

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