CN114057079B - Chain extension detection device of passenger conveyor - Google Patents
Chain extension detection device of passenger conveyor Download PDFInfo
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- CN114057079B CN114057079B CN202110811095.5A CN202110811095A CN114057079B CN 114057079 B CN114057079 B CN 114057079B CN 202110811095 A CN202110811095 A CN 202110811095A CN 114057079 B CN114057079 B CN 114057079B
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B27/00—Indicating operating conditions of escalators or moving walkways
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B25/00—Control of escalators or moving walkways
- B66B25/006—Monitoring for maintenance or repair
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- Escalators And Moving Walkways (AREA)
Abstract
The present invention relates to a chain extension detection device of a passenger conveyor, which can accurately detect the extension of a chain even at a remote place. The chain elongation detection device of the passenger conveyor of the embodiment comprises: a 1 st sensor unit that detects a rotation state of one of a pair of sprockets on which a chain is mounted, and outputs a 1 st rotation detection signal; a 2 nd sensor unit for detecting the rotation state of the other sprocket and outputting a 2 nd rotation detection signal; and a control unit configured to detect elongation of the chain based on a difference between a phase of the 1 st rotation detection signal and a phase of the 2 nd rotation detection signal.
Description
The present application is based on Japanese patent application 2020-131993 (application day: month 3 of 2020), and enjoys priority of the application. The present application is incorporated by reference in its entirety.
Technical Field
The embodiment of the invention relates to a chain extension detection device of a passenger conveyor.
Background
Conventionally, in a passenger conveyor, a plurality of steps are connected in a loop by a step chain. The step chain is driven by the drive of a motor connected via a sprocket, a drive chain, and a speed reducer, whereby the steps are rotated (circulated). Further, the moving handrail is driven by a handrail belt drive chain. These chains are subject to elongation over time. Thus, when elongation (slackening) occurs in the chain, the engagement between the chain and the sprocket becomes poor.
Therefore, maintenance and inspection work is required to confirm whether or not the chain is extended. When an operator goes to the field, the deformation amount when the chain is pushed or pulled and the dimension between chain rollers constituting the chain are directly measured by a vernier caliper or the like, and thus it is confirmed whether or not the chain is elongated, and the elongation of the chain cannot be remotely detected.
Disclosure of Invention
An object of the present embodiment is to provide a chain extension detection device for a passenger conveyor, which can accurately detect the extension of a chain even at a remote location.
The chain elongation detection device of the passenger conveyor of the embodiment comprises: a 1 st sensor unit that detects a rotation state of one of a pair of sprockets on which a chain is mounted, and outputs a 1 st rotation detection signal; a 2 nd sensor unit for detecting the rotation state of the other sprocket and outputting a 2 nd rotation detection signal; and a control unit configured to detect elongation of the chain based on a difference between a phase of the 1 st rotation detection signal and a phase of the 2 nd rotation detection signal.
According to the chain extension detecting device of the passenger conveyor with the above structure, the extension of the chain can be accurately detected even at a remote place.
Drawings
Fig. 1 is a diagram showing a schematic configuration example of an escalator to which the chain extension detection device according to the embodiment is applied.
Fig. 2 is a schematic block diagram of a control system of the escalator.
Fig. 3 is a main part explanatory view of the chain extension detecting device of embodiment 1.
Fig. 4 is an explanatory diagram of the principle of elongation detection in the embodiment.
Fig. 5 is an operation flowchart of the embodiment.
Fig. 6 is a main part explanatory diagram of the chain extension detecting device of embodiment 2.
Detailed Description
The present invention will be described in detail below with reference to the drawings. The following embodiments are examples, and the scope of the invention is not limited thereto. The constituent elements in the following embodiments include elements that can be easily recognized by those skilled in the art or substantially the same elements.
Fig. 1 is a diagram showing a schematic configuration example of an escalator to which the chain extension detection device according to the embodiment is applied.
In the present embodiment, an escalator 100 will be described as an example of a passenger conveyor that moves a plurality of steps connected in a loop in a revolving (circulating) manner.
As shown in fig. 1, a chain extension detecting device (hereinafter, simply referred to as a chain extension detecting device) 10 of an escalator of an embodiment is provided in an escalator 100. The escalator 100 is provided in a building (also referred to as a building), and transports passengers and the like across one floor of the building (hereinafter referred to as a lower floor) and another floor above the lower floor (hereinafter referred to as an upper floor).
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 of 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 speed reducer 106, a drive chain (chain) 112, a drive wheel (sprocket) 113, a driven wheel (sprocket) 114, and a step chain (chain) 115.
The motor 105 is provided on the upper layer side of the escalator 100. A speed reducer 106 is mounted on the output shaft of the motor 105.
The drive chain 112 is formed in a ring shape and spans the drive sprocket 111 and the driven sprocket 113 of the reduction gear 106. The drive chain 112 circulates 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, thereby rotating the driven sprocket 113. 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.
The escalator 100 is operated by driving the driven sprocket 113, thereby driving the step chain 115 provided between the driven sprocket 113 and the driven pulley 114, and rotationally moving the plurality of steps 120 connected in a loop.
When the escalator 100 is operated in the descending direction, the steps 120 adjacent to each other in the traveling direction among the steps 120 in the upper landing (upper landing 101) are horizontally driven out of the truss 110. Then, in the upper transition curve, the step difference between the adjacent steps 120 expands, and the plurality of steps 120 are converted into a step shape. Then, in the intermediate inclined portion, the plurality of steps 120 are stepped down.
Then, in the lower transition curve, the step difference between the adjacent steps 120 is reduced, and the plurality of steps 120 are horizontally changed. Then, at the lower landing (lower landing 102), the steps 120 are again horizontally shaped and enter the truss 110. Then, the steps 120 are reversed upward after entering the truss 110, and rise horizontally on the return side. Then, the steps 120 are reversed again, and the upper landing 101 is driven out of the truss 110.
When the escalator 100 is operated in the upward direction, the operation is reversed to the above.
In this way, the steps 120 are driven out of the truss 110 or into the truss 110 by making the tread surface of the upper surface on which the user sits horizontal at the upper-layer-side entrance 101 and the lower-layer-side entrance 102.
The escalator 100 includes a pair of balustrades 130 on both sides in the traveling direction of the steps 120. The balustrade 130 mainly includes a skirt (not shown), an inner decking 131, glass 132, and a handrail 133.
The skirt guard is provided near and spans between the upper landing port 101 and the lower landing port 102 on both sides in a direction (width direction) orthogonal to the traveling direction (descending direction and ascending direction of the operation of the escalator 100) of the plurality of steps 120.
An inner cover plate 131 is installed on the upper side of the skirt guard. A glass 132 is installed on the upper side of the inner cap plate 131. The handrail belt 133 is movably fitted to a handrail rail (not shown) attached to the outer periphery of the glass 132. The escalator 100 is configured such that the handrail 133 of the balustrade 130 is rotated by a handrail drive chain (not shown) in accordance with the traveling and traveling directions of the plurality of steps 120.
As described above, the escalator 100 uses three chains, i.e., a drive chain 112, a step chain 115, and a handrail drive chain, not shown. The drive chain 112, step chain 115 and handrail drive chain are provided with the following references, respectively: when the center portion is deflected, if the runout amplitude (deformation amount) is equal to or less than a reference value Xmm (for example, several tens of mm), it is judged to be normal.
In other words, when the runout amplitude is larger than Xmm, the drive chain 112, the step chain 115, and the handrail drive chain are elongated, and it is determined that the condition is abnormal.
When such a chain is extended, the rotation start timing of the sprocket on which the chain is mounted is deviated.
For example, in the case of the drive chain 112, in a stage in which the drive sprocket 111 functioning as a drive sprocket and the driven sprocket 113 functioning as a driven sprocket are shifted from a stopped state to an operating state (rotational state), a deviation occurs from the rotation start timing of the drive sprocket 111 functioning as a drive sprocket to the rotation start timing of the driven sprocket 113 functioning as a driven sprocket in accordance with the elongation of the drive chain.
Therefore, when the deviation of the rotation start timing is equal to or longer than the predetermined reference time, it can be determined that the corresponding chain is elongated by a predetermined reference amount or more.
In the following, the present embodiment will be described with reference to a case where the elongation of the drive chain 112 is detected.
Such an operation of the escalator 100 is achieved by controlling the decelerator 106 and the motor 105 by a control panel (control device) 200 provided in the truss 110.
The control panel 200 is a computer physically having a CPU, a RAM, a ROM, and the like. By loading the application program held in the ROM into the RAM and executing the application program by the CPU, the various devices in the escalator 100 are operated under the control of the CPU, and the functions of the control panel 200 are realized by reading and writing data from and into the RAM and the ROM.
Fig. 2 is a schematic block diagram of a control system of the escalator.
As shown in fig. 2, the control panel 200 of the escalator 100 is communicably connected to the chain extension detection device 10 and a remote monitoring device 300 provided at a remote place of the escalator 100, and transmits and receives detection signals, drive signals, and control signals.
The control panel 200 controls the movement start/stop, the movement speed, and the like of the steps 120, thereby driving and controlling the escalator 100.
The control panel 200 includes a control unit 201, a control storage unit 202, and a communication unit 203. Here, the control panel 200 can perform drive control of the escalator 100 based on an instruction from the remote monitoring device 300 input via the communication unit 203. That is, the escalator 100 can be operated remotely by the remote monitoring device 300.
When the control unit 201 receives the detection signal related to the chain extension, which is the distance detection state of the 1 st sensor unit 11 and the 2 nd sensor unit 12, from the control unit 13 of the chain extension detection device 10, it controls the control storage unit 202 to store history information of the detection related to the chain extension. When receiving the detection signal, the control unit 201 performs control to transmit notification data of the detection state related to the chain extension to the remote monitoring apparatus 300.
The control storage unit 202 is a storage device, and stores the distance detection state of the detection signal related to the chain extension received from the control unit 201, the control state information of the control unit 13, and the like. Specifically, the control storage unit 202 stores, as operation history information of the 1 st sensor unit 11 and the 2 nd sensor unit 12, the operation time, the distance detection states of the 1 st sensor unit 11 and the 2 nd sensor unit 12, identification information for identifying the 1 st sensor unit 11 and the 2 nd sensor unit 12, and the like. The control storage unit 202 stores the control time and the control state (including various operation detection states) of the control unit 13 as control history information.
The communication unit 203 performs control of communication with the remote monitoring apparatus 300.
The remote monitoring device 300 is provided at a remote monitoring center remote from the escalator 100, for example.
The remote monitoring device 300 is communicably connected to the control panel 200 via the communication unit 303, and transmits and receives detection data corresponding to a detection signal in the control panel 200, control history data, and control data for controlling the control panel 200 and thus the escalator 100.
A monitor of the remote monitoring apparatus 300 remotely monitors each part of the escalator 100 via a remote monitoring disc (not shown). As shown in fig. 2, the remote monitoring apparatus 300 includes a control unit 301, a monitoring storage unit 302, a communication unit 303, and an alarm unit 304.
The control unit 301 performs control for notifying the alarm unit 304 that the drive chain 112 has been extended, or performs control for causing the monitoring storage unit 302 to store the detection history information of the 1 st sensor unit 11 and the 2 nd sensor unit 12, based on the control signal related to the distance detection state of the 1 st sensor unit 11 and the 2 nd sensor unit 12 received from the control panel 200.
The monitoring storage unit 302 is a storage device, and stores the distance detection states of the 1 st sensor unit 11 and the 2 nd sensor unit 12 received from the control unit 301 as the detection history information of the 1 st sensor unit 11 and the 2 nd sensor unit 12. The monitoring storage unit 302 stores, for each monitor, a contact address including a telephone number, a FAX number, and an email address as monitor contact information.
The communication unit 303 performs control of communication with the control panel 200.
The alarm unit 304 is constituted by, for example, a speaker, an alarm lamp, a communication device including a telephone, FAX, email, and the like. The alarm unit 304 is used to notify the monitor that the drive chain 112 is extended. The alarm unit 304 outputs a sound from, for example, a speaker or an alarm, or lights an alarm lamp, or notifies based on the monitor contact information stored in advance via the communication device, based on a control signal from the control unit 301.
As shown in fig. 1, the chain extension detecting device 10 of the present embodiment detects the extension of the chain of the escalator 100, specifically, detects the extension of the drive chain 112.
The chain extension detection device 10 generally includes a 1 st sensor unit 11, a 2 nd sensor unit 12, a control unit 13, and an alarm unit 14.
In the above configuration, the 1 st sensor unit 11 detects the timing of passing the teeth of the drive sprocket 111 and outputs the 1 st detection pulse signal SG1 as the 1 st detection signal when the escalator 100 is operated.
The 2 nd sensor unit 12 detects the passing timing of the teeth of the driven sprocket 113 and outputs a 2 nd detection pulse signal SG2 as a 2 nd detection signal when the escalator 100 is operated.
In this case, as the 1 st sensor unit 11 and the 2 nd sensor unit 12, a transmissive photoelectric sensor, a reflective photoelectric sensor, a noncontact sensor, or the like can be used.
The control unit 13 is configured as a so-called microcomputer, detects whether or not the drive chain 112 has elongated by a predetermined reference value or more based on the 1 st detection pulse signal SG1 output from the 1 st sensor unit 11 and the 2 nd detection pulse signal SG2 output from the 2 nd sensor unit 12 in accordance with a control program, notifies the control unit 201 of the control panel 200 of the detected state, and controls the alarm unit 14 to output an alarm when the drive chain 112 has elongated by the predetermined reference value or more.
The alarm unit 14 performs alarm processing when the drive chain 112 is extended by a predetermined reference value or more under the control of the control unit 13.
[1] Embodiment 1
Fig. 3 is a main part explanatory view of the chain extension detecting device of embodiment 1.
As shown in fig. 3, the chain extension detecting device 10 according to embodiment 1 includes a 1 st sensor unit 11 and a 2 nd sensor unit 12.
In this case, the 1 st sensor unit 11 is provided to detect the rotation of the teeth of the drive sprocket 111 as the drive sprocket, and the 2 nd sensor unit 12 is provided to detect the rotation of the teeth of the driven sprocket 113 as the driven sprocket, and is fixed via fixing tools, not shown, respectively.
In the above configuration, the 1 st sensor unit 11 outputs the 1 st pulse signal SG1 (see fig. 4) of the number of pulses according to the rotation state of the teeth as the teeth of the drive sprocket 111 rotate.
On the other hand, the 2 nd sensor unit 12 outputs a 2 nd pulse signal SG2 (see fig. 4) of the number of pulses according to the rotation state of the teeth as the teeth of the driven sprocket 113 rotate.
When the drive sprocket 111 and the driven sprocket 113 shift from the stopped state to the rotated state, the 1 st sensor unit 11 and the 2 nd sensor unit 12 start outputting pulse signals (1 st pulse signal SG1 and 2 nd pulse signal SG 2) respectively as rotation starts.
Accordingly, the control unit 13 can detect that the drive chain 112 interposed between the drive sprocket 111 and the driven sprocket 113 is stretched by a predetermined reference amount or more when the deviation between the output start timing of the pulse in the 1 st pulse signal SG1 and the output start timing of the pulse in the 2 nd pulse signal SG2 is equal to or longer than a predetermined reference time.
Even in the case of a steady rotation state, the phase of the 1 st pulse signal SG1 and the phase of the 2 nd pulse signal SG2 are maintained at a predetermined phase difference according to the elongation of the drive chain 112.
The alarm unit 14 performs alarm processing when the drive chain 112 is extended by a predetermined reference value or more under the control of the control unit 13.
Next, the principle of elongation detection according to the embodiment will be described.
Fig. 4 is an explanatory diagram of the principle of elongation detection in the embodiment.
When the escalator 100 is started and the motor 105 is started, the drive chain 112 starts to circulate around the driven sprocket 113 and the drive sprocket 111 of the decelerator 106 by the driving force of the motor 105.
At this time, since the driving force of the motor 105 is transmitted via the decelerator 106, the driving sprocket 111 starts to rotate earlier than the driven sprocket 113.
As a result, as shown in fig. 4, the first pulse of the 1 st pulse signal SG1, which is the pulse signal output from the 1 st sensor unit 11, is output to the control unit 13 at time t 1.
Further, the driving force of the motor 105 is transmitted to the driven sprocket 113 via the driving chain 112 as the teeth of the driving sprocket 111 rotate.
As a result, the driven sprocket 113 starts to rotate at the time when the elongation of the drive chain stretched between the drive sprocket 111 and the driven sprocket 113 is absorbed.
As shown in fig. 4, the first pulse of the 2 nd pulse signal SG2, which is the pulse signal output from the 2 nd sensor unit 12, is output to the control unit 13 at time t 2.
As a result, control unit 13 calculates a time difference Δθ between time t1, which is the output start timing of the pulse of 1 st pulse signal SG1, and time t2, which is the output start timing of the pulse of 2 nd pulse signal SG2, and detects the calculated time difference as a phase difference.
However, as described above, when the deviation between the output start timing of the pulse in the 1 st pulse signal SG1 and the output start timing of the pulse in the 2 nd pulse signal SG2 is equal to or greater than the predetermined reference time, the control unit 13 determines that the drive chain 112 stretched between the drive sprocket 111 and the driven sprocket 113 is elongated by the predetermined reference amount or more, and thus compares the time difference Δθr corresponding to the predetermined reference time with the time difference Δθ, except for the case where the teeth of the sprocket are missing and cannot be detected (in this case, the phase is largely changed and thus can be detected and excluded).
In the example of fig. 4, since the time difference Δθ < the time difference Δθr, the control unit 13 determines that the drive chain 112 stretched between the drive sprocket 111 and the driven sprocket 113 does not extend by a predetermined reference amount or more.
On the other hand, when the time difference Δθ is equal to or larger than the time difference Δθr, the control unit 13 determines that the drive chain 112 stretched between the drive sprocket 111 and the driven sprocket 113 is elongated by a predetermined reference amount or more.
As described above, according to embodiment 1, it is possible to easily detect that the chain is extended by detecting only the deviation in the rotation start timing of the pair of sprockets on which the chain is mounted.
Next, the operation of embodiment 1 will be described.
Fig. 5 is an operation flowchart of the embodiment.
In the following description, the chain extension detecting device 10 according to embodiment 1 of fig. 3 will be described as an example. In addition, in the operation of the drive chain, the driven sprocket 113 functions as a driven wheel with respect to the drive sprocket 111 functioning as a drive wheel.
In this state, power is supplied to the escalator 100.
First, the control unit 201 of the control panel 200 detects whether or not the key switch is on (step S11), and when the key switch is still in the off state (step S11; no), the control panel enters the standby state.
In the judgment of step S11, when the push switch is in the ON state (step S11; yes), the escalator is driven (step S12).
Next, the control unit 13 of the chain extension detection device 10 detects the 1 st pulse signal SG1 output from the 1 st sensor unit 11 (step S13), and detects the timing of the output of the 1 st pulse signal SG1 from the 1 st sensor unit 11, that is, the timing of the start of rotation of the drive sprocket 111 (timing t1 in fig. 4).
Next, the control unit 13 detects the 2 nd pulse signal SG2 output from the 2 nd sensor unit 12 (step S14), and detects the timing of the output of the rotation pulse of the 2 nd pulse signal SG2 from the 2 nd sensor unit 12, that is, the timing of the start of rotation of the driven sprocket 113 (time t2 in fig. 4).
Then, control unit 13 calculates a time difference Δθ between time t1, which is the output start timing of the pulse of 1 st pulse signal SG1, and time t2, which is the output start timing of the pulse of 2 nd pulse signal SG2, as a phase difference, stores the calculated phase difference as a calculation history, and determines whether or not the phase difference is equal to or greater than a phase difference (time difference) Δθr corresponding to a predetermined reference time (step S15).
In the judgment in step S15, when the phase difference Δθ < the phase difference Δθr (step S15; no), the control unit 13 judges that the drive chain 112 stretched between the drive sprocket 111 and the driven sprocket 113 does not extend by a predetermined reference amount or more, shifts the process to step S12 again, and repeats the same process.
In the judgment in step S15, when the time difference Δθ is equal to or greater than the time difference Δθr, the control unit 13 judges that the drive chain 112 stretched between the drive sprocket 111 and the driven sprocket 113 is elongated by a predetermined reference amount or more, and controls the alarm unit 14 to output an alarm (step S16).
Next, the control unit 13 notifies the control unit 201 of the control panel 200 of the abnormality (step S17), and notifies the stored history in the process of step S15 (step S18). Then, the escalator stopping process is performed to end the process (step S19).
In this case, the escalator stopping process is performed by alarming via the alarm unit 14 and slowly stopping the driving of the motor 105.
Then, the operator and the remote monitor determine that the drive chain 112 is extended, and repair and replacement of the drive chain 112 are performed.
The above description has been made with respect to detecting the elongation of the drive chain 112 at the start of the driving of the escalator, but it is also possible to detect the elongation of the drive chain 112 by presetting the rotation reference positions of the drive sprocket 111 as the drive sprocket and the driven sprocket 113 as the driven sprocket, and continuously detecting the phase difference between these rotation reference positions.
With such a configuration, even when the elongation of the drive chain 112 is rapidly generated for some reason, the same can be handled.
As described above, according to the chain extension detection device 10 of the passenger conveyor of embodiment 1, when the phase difference (or the detection time difference of the predetermined rotation reference position) between the rotation of the teeth of the drive sprocket 111 and the rotation of the teeth of the driven sprocket 113 due to the extension of the drive chain 112 becomes larger than the predetermined phase difference (or the time difference), it is determined that the extension is detected, the alarm unit of the chain extension detection device 10 performs the alarm process, or the alarm unit 304 of the remote monitoring device 300 notifies.
Further, according to the chain extension detecting device 10 of embodiment 1, the detection history information of the 1 st sensor unit 11 or the 2 nd sensor unit 12 can be stored in the control storage unit 202 of the control panel 200 and the monitoring storage unit 302 of the remote monitoring device 300.
As described above, according to the chain extension detection device 10 of the passenger conveyor of the present embodiment, the extension of the drive chain 112 can be accurately detected and notified, or the detection histories of the 1 st sensor unit 11 and the 2 nd sensor unit 12, that is, the change in the time series of the extension generated by the drive chain 112 can be recorded.
As described above, according to the chain extension detecting device 10 of embodiment 1, the extension of the chain of the escalator 100 can be accurately detected remotely.
In embodiment 1, the 1 st sensor unit 11 and the 2 nd sensor unit 12 are used as the drive timing detection unit, but the same applies if the rotational position of the sprocket that rotates the detection target can be detected by a reflection type optical sensor, a transmission type optical sensor, or the like.
[2] Embodiment 2
Fig. 6 is a main part explanatory diagram of the chain extension detecting device of embodiment 2.
Embodiment 2 is different from embodiment 1 in that the rotation of the teeth of the sprocket is not detected, but the rotation of the teeth of a disk-shaped detection piece that rotates integrally with the sprocket is detected.
Accordingly, the possibility of tooth missing without applying a load to the detection piece is reduced, maintainability is improved, and the detection piece can be disposed at a certain distance from the sprocket, so that the influence of oil dirt and the like can be reduced.
As shown in fig. 3, the chain extension detecting device 10 according to the embodiment includes a 1 st sensor unit 11 and a 2 nd sensor unit 12.
In this case, the 1 st sensor unit 11 is provided to detect rotation of teeth of a disk-shaped detection piece 21 having a plurality of teeth and rotating integrally with the drive sprocket 111, and is fixed by a fixing tool not shown.
The 2 nd sensor unit 12 is provided to detect rotation of teeth of a disk-shaped detection piece 22 having a plurality of teeth and rotating integrally with the driven sprocket 113, and is fixed by a fixing tool not shown.
In the above configuration, the 1 st sensor unit 11 outputs the 1 st pulse signal SG1 of the number of pulses according to the rotation state of the teeth as the teeth of the detection piece 21 rotate.
On the other hand, the 2 nd sensor unit 12 outputs the 2 nd pulse signal SG2 of the number of pulses according to the rotation state of the teeth as the teeth of the detection piece 22 rotate.
Then, when the drive sprocket 111 and the driven sprocket 113 are shifted from the stopped state to the rotated state, the 1 st sensor unit 11 and the 2 nd sensor unit 12 start outputting pulse signals (1 st pulse signal SG1 and 2 nd pulse signal SG 2) as the detection pieces 21 and 22 start rotating, respectively.
Accordingly, the control unit 13 can detect that the drive chain 112 interposed between the drive sprocket 111 and the driven sprocket 113 is stretched by a predetermined reference amount or more when the deviation between the output start timing of the pulse in the 1 st pulse signal SG1 and the output start timing of the pulse in the 2 nd pulse signal SG2 is equal to or longer than a predetermined reference time.
As described above, according to the chain extension detecting device 10 of embodiment 2, the extension of the chain of the escalator 100 can be accurately detected remotely, and maintenance performance and measurement accuracy can be improved.
[3] Modification of the embodiment
In the above embodiment, the case of detecting the elongation of the drive chain 112 has been described, but the chain elongation detecting device 10 may be configured to detect the elongation of the step chain 115 and the handrail drive chain. Thus, the chain elongation detecting device 10 can accurately detect the elongation of various chains disposed in the escalator 100.
In the above-described embodiment, the escalator 100 is described as an example of a passenger conveyor in which a plurality of steps 120 connected in a loop form are operated to perform a revolving motion, but the present embodiment is not limited to the escalator 100, and can be similarly applied to other types of passenger conveyors such as a moving walk.
The above embodiments and modifications can be combined within a range not departing from the gist of the invention.
While the present invention has been described with reference to several embodiments and modifications thereof, these embodiments and modifications are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other modes, and various omissions, substitutions, and changes can be made without departing from the spirit 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 scope equivalent thereto.
Claims (5)
1. A chain extension detection device for a passenger conveyor is provided with:
a 1 st sensor unit that detects a rotation state of a tooth of one of a pair of sprockets on which a chain is mounted, and outputs a 1 st rotation detection signal;
a 2 nd sensor unit detecting a rotation state of the teeth of the other sprocket and outputting a 2 nd rotation detection signal;
a control unit configured to detect elongation of the chain based on a difference between a phase of the 1 st rotation detection signal and a phase of the 2 nd rotation detection signal; and
and a storage unit configured to store the 1 st rotation detection signal and the 2 nd rotation detection signal as detection history information, and to store a difference between a phase of the 1 st rotation detection signal and a phase of the 2 nd rotation detection signal as calculation history.
2. The chain extension detecting device of a passenger conveyor according to claim 1, wherein,
the control unit determines that chain elongation of a predetermined reference value or more has occurred when a difference between a phase of the 1 st rotation detection signal and a phase of the 2 nd rotation detection signal exceeds a predetermined reference phase difference.
3. The chain extension detecting device of a passenger conveyor according to claim 1, wherein,
the one sprocket is a driving sprocket, and the other sprocket is a driven sprocket driven by the operation of the driving sprocket.
4. The chain extension detecting device for a passenger conveyor according to claim 3, wherein,
the control unit calculates the phase difference when the drive sprocket is shifted from a stopped state to an operating state.
5. The chain extension detecting device for a passenger conveyor according to any one of claims 1 to 4, wherein,
the 1 st sensor unit and the 2 nd sensor unit include a non-contact sensor or an optical sensor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-131993 | 2020-08-03 | ||
| JP2020131993A JP7362562B2 (en) | 2020-08-03 | 2020-08-03 | Passenger conveyor chain stretch detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
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| JP7362562B2 (en) | 2023-10-17 |
| JP2022028525A (en) | 2022-02-16 |
| CN114057079A (en) | 2022-02-18 |
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