CN114057079A - Chain elongation detection device of passenger conveyor - Google Patents
Chain elongation detection device of passenger conveyor Download PDFInfo
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- CN114057079A CN114057079A CN202110811095.5A CN202110811095A CN114057079A CN 114057079 A CN114057079 A CN 114057079A CN 202110811095 A CN202110811095 A CN 202110811095A CN 114057079 A CN114057079 A CN 114057079A
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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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Abstract
The invention relates to a chain elongation detection device of a passenger conveyor, which can accurately detect the elongation of a chain even in a remote place. The chain elongation detection device of a passenger conveyor of an embodiment comprises: a 1 st sensor unit that detects a rotation state of one sprocket 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 a rotation state of the other sprocket and outputting a 2 nd rotation detection signal; and a control unit for detecting the 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
This application is based on Japanese patent application No. 2020-. This application incorporates by reference the entirety of this application.
Technical Field
Embodiments of the present invention relate to a chain elongation detecting 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 driving a motor connected via a sprocket, a drive chain, and a reducer, and the steps are rotated (circulated). In addition, the moving handrail is driven by a handrail drive chain. These chains are subject to elongation over years of use. As such, when the chain is elongated (slackened), the engagement between the chain and the sprocket is deteriorated.
Therefore, maintenance and inspection work is required to confirm whether the chain is elongated. When an operator goes to the site, the amount of deformation when pressing or pulling the chain and the dimension between the chain rollers constituting the chain are directly measured by a vernier caliper or the like, and it is determined whether or not the chain is elongated, and the elongation of the chain cannot be detected remotely.
Disclosure of Invention
An object of the present embodiment is to provide a chain elongation detection device for a passenger conveyor, which can accurately detect the elongation of a chain even at a remote location.
The chain elongation detection device of a passenger conveyor of an embodiment comprises: a 1 st sensor unit that detects a rotation state of one sprocket of a pair of sprockets on which a chain is mounted, and outputs a 1 st rotation detection signal; a 2 nd sensor unit that detects a rotation state of the other sprocket and outputs a 2 nd rotation detection signal; and a control unit for detecting the 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 elongation detection device of the passenger conveyor with the structure, the elongation of the chain can be accurately detected even in a remote place.
Drawings
Fig. 1 is a diagram showing a schematic configuration example of an escalator to which a chain elongation detecting device according to an embodiment is applied.
Fig. 2 is a schematic configuration block diagram of a control system of an escalator.
Fig. 3 is a main part explanatory view of the chain elongation detecting device according to embodiment 1.
Fig. 4 is an explanatory diagram of the principle of elongation detection according to the embodiment.
Fig. 5 is an operation flowchart of the embodiment.
Fig. 6 is a main part explanatory view of the chain elongation detecting device according to embodiment 2.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are illustrative, and the scope of the invention is not limited thereto. The components in the following embodiments include components that can be easily conceived by those skilled in the art or substantially the same components.
Fig. 1 is a diagram showing a schematic configuration example of an escalator to which a chain elongation detecting device according to an embodiment is applied.
In the present embodiment, an escalator 100 will be described as an example of a passenger conveyor that operates by rotating (circulating) a plurality of steps connected in a loop.
As shown in fig. 1, a chain elongation detecting device (hereinafter, simply referred to as a chain elongation detecting device) 10 of an escalator according to an embodiment is provided in an escalator 100. The escalator 100 is installed 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 balustrade 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, 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 as drive sources.
The motor 105 is provided on the upper deck side of the escalator 100. A reducer 106 is attached to an output shaft of the motor 105.
The drive chain 112 is formed in an annular shape, and is spanned over 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 reduction gear 106 by the drive force of the motor 105 transmitted through the reduction gear 106, thereby rotating the driven sprocket 113. That is, the drive chain 112 transmits the driving force of the motor 105 transmitted via the reducer 106 to the driven sprocket 113.
The escalator 100 drives the driven sprocket 113 to drive a step chain 115 that is bridged between the driven sprocket 113 and the driven pulley 114, and operates by rotating and moving a plurality of steps 120 that are connected in an endless manner.
When the escalator 100 is operated in the descending direction, the steps 120 adjacent to each other in the traveling direction among the plurality of steps 120 are horizontally taken out from the truss 110 at the upper landing (the upper landing 101). Then, in the upper transition curve, the step difference between the adjacent steps 120 is enlarged, and the plurality of steps 120 are transitioned into a step shape. Then, in the intermediate inclined portion, the plurality of steps 120 are stepped and descend.
Then, in the lower transition curve, the step difference between the adjacent steps 120 is reduced, and the plurality of steps 120 are shifted to be horizontal. Then, at the lower landing (lower landing 102), the plurality of steps 120 are again horizontal and enter the truss 110. Then, the plurality of steps 120 enter the truss 110, then turn upward, and rise horizontally on the return side. Then, the plurality of steps 120 are reversed again, and the upper landing entrance 101 is pulled out from the truss 110.
When the escalator 100 is operated in the ascending direction, the operation is reversed.
In this way, the steps 120 are extended out of the truss 110 or inserted into the truss 110 with the tread surface of the upper surface on which the user sits being horizontal at the upper landing entrance 101 and the lower landing 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 is mainly composed of a skirt guard (not shown), an inner cover 131, a glass 132, and a handrail 133.
The skirt guard plates are provided 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 so as to be adjacent to and straddle between the upper-stage landing entrance 101 and the lower-stage landing entrance 102.
An inner cover plate 131 is attached to the upper side of the skirt guard. A glass 132 is mounted on the upper side of the inner cover 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 the handrail 133 of the balustrade 130 is rotated and moved by a handrail drive chain (not shown) in accordance with the traveling and traveling directions of the steps 120.
As described above, the escalator 100 uses three chains, i.e., the drive chain 112, the step chain 115, and the handrail drive chain, which is not shown. The drive chain 112, the step chain 115 and the handrail belt drive chain are respectively provided with the following references: when the central portion is deflected, if the runout width (deformation amount) is equal to or less than a reference value Xmm (for example, several tens of mm), it is determined to be normal.
In other words, if the runout width is larger than Xmm, the drive chain 112, the step chain 115, and the handrail drive chain are elongated and determined to be abnormal.
When such a chain is stretched, the rotation start timing of the sprocket on which the chain is mounted varies.
For example, in the case of the drive chain 112, at the stage when the drive sprocket 111 functioning as the drive sprocket and the driven sprocket 113 functioning as the driven sprocket are shifted from the stopped state to the operated state (rotated state), a deviation occurs in accordance with the extension of the drive chain from the rotation start timing of the drive sprocket 111 functioning as the drive sprocket to the rotation start timing of the driven sprocket 113 functioning as the driven sprocket.
Therefore, when the deviation of the rotation start timing becomes equal to or longer than a predetermined reference time, it can be determined that the corresponding chain has elongated by a predetermined reference amount or more.
Hereinafter, in the present embodiment, a case of detecting the elongation of the drive chain 112 will be described as an example.
The operation of the escalator 100 is realized by controlling the speed reducer 106 and the motor 105 with a control panel (control device) 200 provided in the truss 110.
The control panel 200 is a computer physically having a CPU, RAM, ROM, and the like. The functions of the control panel 200 are realized by loading an application program held in the ROM into the RAM and executing the application program by the CPU, thereby operating various devices in the escalator 100 under the control of the CPU, and reading and writing data from and into the RAM and the ROM.
Fig. 2 is a schematic configuration block diagram of a control system of an escalator.
As shown in fig. 2, the control panel 200 of the escalator 100 is connected to the chain extension detection device 10 and the remote monitoring device 300 installed at a remote location of the escalator 100 so as to be able to communicate with each other, and transmits and receives a detection signal, a drive signal, and a control signal.
The control panel 200 controls the start and stop of movement, the movement speed, and the like of the steps 120, thereby controlling the drive of 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 control the driving of the escalator 100 based on an instruction from the remote monitoring apparatus 300 input via the communication unit 203. That is, the escalator 100 can be remotely operated by the remote monitoring apparatus 300.
When receiving the distance detection states of the 1 st sensor unit 11 and the 2 nd sensor unit 12, that is, the detection signals relating to the chain elongation, from the control unit 13 of the chain elongation detecting device 10, the control unit 201 performs control to cause the control storage unit 202 to store history information of the detection relating to the chain elongation. Further, the control unit 201, upon receiving the detection signal, performs control of transmitting notification data of the detection state relating to the chain elongation to the remote monitoring device 300.
The control storage unit 202 is a storage device that stores the distance detection state of the detection signal relating to chain elongation 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, operation time, 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 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 apparatus 300.
The remote monitoring apparatus 300 is installed at a remote monitoring center, for example, which is remote from the escalator 100.
The remote monitoring apparatus 300 is connected to the control panel 200 via the communication unit 303 so as to be capable of communicating with each other, and transmits and receives detection data and control history data corresponding to the detection signal in the control panel 200, and control data for controlling the control panel 200 and further the escalator 100.
A monitor of the remote monitoring apparatus 300 remotely monitors each part of the escalator 100 by a remote monitoring panel (not shown). As shown in fig. 2, the remote monitoring apparatus 300 includes a control unit 301, a storage unit 302 for monitoring, 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 storing detection history information of the 1 st sensor unit 11 and the 2 nd sensor unit 12 in the monitoring storage unit 302, based on a control signal relating 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 that 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 detection history information of the 1 st sensor unit 11 and the 2 nd sensor unit 12. The monitoring storage unit 302 stores contact information including a telephone number, a FAX number, and an email address for each monitor as monitor contact information.
The communication unit 303 controls 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, a FAX, an e-mail, and the like. The alarm unit 304 is used to notify the monitor that the drive chain 112 is elongated. The alarm unit 304 outputs a sound from, for example, a speaker or an alarm, or lights an alarm lamp, or performs notification based on the pre-stored contact information of the monitor via the communication device, based on a control signal from the control section 301.
As shown in fig. 1, the chain elongation detecting device 10 of the present embodiment detects elongation of the chain of the escalator 100, specifically, elongation of the drive chain 112.
The chain elongation detecting device 10 is basically provided with 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 operating.
The 2 nd sensor unit 12 detects the timing of passage of the teeth of the driven sprocket 113 when the escalator 100 is operating, and outputs a 2 nd detection pulse signal SG2 as a 2 nd detection signal.
In this case, as the 1 st sensor unit 11 and the 2 nd sensor unit 12, a transmission type photosensor, a reflection type photosensor, a non-contact sensor, or the like can be used.
The control unit 13 is configured as a so-called microcomputer, and detects whether or not the drive chain 112 has elongated at a predetermined reference value or more based on a 1 st detection pulse signal SG1 output from the 1 st sensor unit 11 and a 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 detection state, and controls the alarm unit 14 to output an alarm when the drive chain 112 has elongated at the predetermined reference value or more.
The alarm unit 14 performs alarm processing when the drive chain 112 has elongated 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 elongation detecting device according to embodiment 1.
As shown in fig. 3, the chain elongation 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 rotation of the teeth of the drive sprocket 111 as a drive sprocket, and the 2 nd sensor unit 12 is provided to detect rotation of the teeth of the driven sprocket 113 as a driven sprocket, and is fixed via a fixing tool, not shown, respectively.
In the above configuration, the 1 st sensor unit 11 outputs the 1 st pulse signal SG1 (see fig. 4) having the number of pulses corresponding 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 the 2 nd pulse signal SG2 (see fig. 4) having the number of pulses corresponding to the tooth rotation state as the teeth of the driven sprocket 113 rotate.
When the driving sprocket 111 and the driven sprocket 113 transition from the stopped state to the rotated state, the 1 st sensor cell 11 and the 2 nd sensor cell 12 start outputting pulse signals (the 1 st pulse signal SG1 and the 2 nd pulse signal SG2) as the rotation starts, respectively.
Therefore, 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 becomes equal to or longer than the predetermined reference time, the control unit 13 can detect that the drive chain 112 stretched between the drive sprocket 111 and the driven sprocket 113 has extended by a predetermined reference amount or more.
Even when the rotation is in the 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 has elongated 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 according to 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 through the reduction gear 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 cell 11, is output to the controller 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 also starts rotating 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 cell 12, is output to the controller 13 at time t 2.
As a result, the controller 13 calculates and detects a time difference Δ θ between time t1, which is the output start timing of the pulse of the 1 st pulse signal SG1, and time t2, which is the output start timing of the pulse of the 2 nd pulse signal SG2, 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 becomes equal to or longer 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 has been elongated by a predetermined reference amount or more, and compares the time difference Δ θ r corresponding to the predetermined reference time with the time difference Δ θ, except for the case where the sprocket tooth is missing and cannot be detected (in this case, the phase is greatly changed and can be detected and excluded).
In the example of fig. 4, since the time difference Δ θ < the time difference Δ θ r, 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 Δ θ is equal to or greater than the time difference Δ θ r, the control unit 13 determines that the drive chain 112 stretched between the drive sprocket 111 and the driven sprocket 113 has extended by a predetermined reference amount or more.
As described above, according to embodiment 1, the occurrence of chain elongation can be easily detected only by detecting a deviation in the rotation start timing of a pair of sprockets on which a 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 elongation detecting device 10 according to embodiment 1 of fig. 3 is described as an example. During the operation of the drive chain, driven sprocket 113 functions as a driven pulley with respect to drive sprocket 111, which functions as a drive pulley.
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 enters the standby state when the key switch is in the off state (step S11; no).
If the key switch is turned on in the judgment of step S11 (step S11; yes), the escalator is driven (step S12).
Next, the controller 13 of the chain elongation detecting device 10 detects the 1 st pulse signal SG1 output from the 1 st sensor unit 11 (step S13), and detects the timing of outputting the pulse of the 1 st pulse signal SG1 from the 1 st sensor unit 11, that is, the timing of starting the rotation of the drive sprocket 111 (time t1 in fig. 4).
Next, the controller 13 detects the 2 nd pulse signal SG2 output from the 2 nd sensor unit 12 (step S14), and detects the timing of output of the rotation pulse of the 2 nd pulse signal SG2 from the 2 nd sensor unit 12, that is, the timing of start of rotation of the driven sprocket 113 (time t2 in fig. 4).
Then, the control unit 13 calculates a time difference Δ θ between the time t1, which is the output start timing of the pulse of the 1 st pulse signal SG1, and the time t2, which is the output start timing of the pulse of the 2 nd pulse signal SG2, as a phase difference, stores the 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) Δ θ r corresponding to a predetermined reference time (step S15).
When the phase difference Δ θ < the phase difference Δ θ r is determined in step S15 (step S15; no), the control unit 13 determines that the drive chain 112 stretched between the drive sprocket 111 and the driven sprocket 113 has not been extended by a predetermined reference amount or more, and shifts the process to step S12 again, and thereafter repeats the same process.
When the time difference Δ θ is equal to or greater than the time difference Δ θ r in the determination of step S15, the control unit 13 determines that the drive chain 112 stretched between the drive sprocket 111 and the driven sprocket 113 has extended by a predetermined reference amount or more, and controls the alarm unit 14 to output an alarm (step S16).
Next, the controller 13 notifies the controller 201 of the control panel 200 of an abnormality (step S17), and notifies the stored history in the processing of step S15 (step S18). Thereafter, the escalator stopping process is performed to end the process (step S19).
In this case, the escalator stopping process is performed by giving an alarm via the alarm unit 14 and slowly stopping the driving of the motor 105.
After that, the operator or the remote monitor determines that the drive chain 112 is extended, and repairs or replaces the drive chain 112.
In the above description, the elongation of the drive chain 112 is detected when the drive of the escalator is started, but it is also possible to set the rotation reference positions of the drive sprocket 111 as the drive sprocket and the driven sprocket 113 as the driven sprocket in advance, and to detect the elongation of the drive chain 112 similarly by continuously detecting the phase difference between these rotation reference positions.
With such a configuration, even when the drive chain 112 is rapidly extended for some reason, the same measures can be taken.
As described above, according to the chain elongation detecting device 10 of the passenger conveyor according to 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 becomes larger than the predetermined phase difference (or the time difference) due to the elongation of the drive chain 112, it is determined that the elongation is detected, and the alarm unit of the chain elongation detecting device 10 performs the alarm process or the alarm unit 304 of the remote monitoring device 300 notifies the elongation.
Further, according to the chain elongation detecting device 10 of the present 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 elongation detecting device 10 of the passenger conveyor of the present embodiment, it is possible to accurately detect and notify the elongation of the drive chain 112, and to record the detection history of the 1 st sensor unit 11 and the 2 nd sensor unit 12, that is, the time-series change in the elongation of the drive chain 112.
As described above, according to the chain elongation detecting device 10 of embodiment 1, the elongation of the chain of the escalator 100 can be accurately detected at a remote place.
Although the configuration of embodiment 1 described above uses the 1 st sensor unit 11 and the 2 nd sensor unit 12 as the drive timing detecting unit, the present invention can be similarly applied if the rotational position of the sprocket to be detected can be detected by a reflective optical sensor, a transmissive optical sensor, or the like.
[2] Embodiment 2
Fig. 6 is a main part explanatory view of the chain elongation detecting device according to embodiment 2.
The present 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 the disc-shaped detection piece that rotates integrally with the sprocket is detected.
Accordingly, since the possibility of tooth loss due to no load applied to the detection piece is reduced, maintainability is improved, and the detection piece can be disposed at a fixed distance from the sprocket, the influence of oil contamination or the like can be reduced.
As shown in fig. 3, the chain elongation detecting device 10 of 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 the rotation of the teeth of the disc-shaped detection piece 21 that rotates integrally with the drive sprocket 111 and has a plurality of teeth, and is fixed via a fixing tool not shown.
The 2 nd sensor unit 12 is provided to detect rotation of teeth of the disc-shaped detection piece 22 that rotates integrally with the driven sprocket 113 and has a plurality of teeth, and is fixed via a fixing tool not shown.
In the above configuration, the 1 st sensor unit 11 outputs the 1 st pulse signal SG1 having the number of pulses corresponding 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 having the number of pulses corresponding to the rotation state of the teeth as the teeth of the detection piece 22 rotate.
When the driving sprocket 111 and the driven sprocket 113 are shifted from the stopped state to the rotated state, the 1 st sensor cell 11 and the 2 nd sensor cell 12 start to output pulse signals (the 1 st pulse signal SG1 and the 2 nd pulse signal SG2) as the detection pieces 21 and 22 start to rotate, respectively.
Therefore, 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 becomes equal to or longer than the predetermined reference time, the control unit 13 can detect that the drive chain 112 stretched between the drive sprocket 111 and the driven sprocket 113 has extended by a predetermined reference amount or more.
As described above, according to the chain elongation detecting device 10 of embodiment 2, the elongation of the chain of the escalator 100 can be accurately detected at a remote place, and the maintainability and the measurement accuracy can be improved.
[3] Modification of the embodiment
In the above-described embodiment, the case of detecting the extension of the drive chain 112 has been described, but the chain extension detecting device 10 may be configured to detect the extension of the step chain 115 or the handrail drive chain. Accordingly, the chain elongation detection device 10 can accurately detect the elongation of each of the chains disposed in the escalator 100.
In the above-described embodiment, the escalator 100 is described as an example of the passenger conveyor in which the plurality of steps 120 connected in a loop shape are operated so as to rotate, 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 walkway.
The above embodiments and modifications can be combined without departing from the scope of the invention.
Several embodiments and modifications of the present invention have been described, but 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 other various ways, and various omissions, substitutions, and changes can be made without departing from the spirit of the invention. These embodiments and modifications 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 (7)
1. A chain elongation detection device for a passenger conveyor includes:
a 1 st sensor unit which detects a rotation state of one sprocket 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 a rotation state of the other sprocket and outputting a 2 nd rotation detection signal; and
and a control unit for detecting the 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.
2. The chain elongation detecting device of a passenger conveyor according to claim 1,
the 1 st sensor unit detects a rotation state of the teeth of the one sprocket and outputs the 1 st rotation detection signal,
the 2 nd sensor unit detects a rotation state of the other sprocket tooth and outputs the 2 nd rotation detection signal.
3. The chain elongation detecting device of a passenger conveyor according to claim 1,
a disc-shaped 1 st detecting piece which rotates integrally with the one sprocket and has a plurality of teeth is mounted on the one sprocket,
a disk-shaped 2 nd detecting piece having a plurality of teeth and rotating integrally with the other sprocket is attached to the other sprocket,
the 1 st sensor unit detects a rotation state of the teeth of the 1 st detection piece and outputs the 1 st rotation detection signal,
the 2 nd sensor unit detects a rotation state of the teeth of the 2 nd detection piece and outputs the 2 nd rotation detection signal.
4. The chain elongation detecting device of a passenger conveyor according to claim 1,
the control unit determines that the chain is elongated above a predetermined reference value when a difference between the phase of the 1 st rotation detection signal and the phase of the 2 nd rotation detection signal exceeds a predetermined reference phase difference.
5. The chain elongation detecting device of a passenger conveyor according to claim 1,
the one sprocket is a drive sprocket, and the other sprocket is a driven sprocket driven by the operation of the drive sprocket.
6. The chain elongation detecting device of a passenger conveyor according to claim 5,
the control unit calculates the phase difference when the drive sprocket is shifted from a stopped state to an operated state.
7. The chain elongation detecting device of a passenger conveyor according to any one of claims 1 to 6,
the 1 st sensor unit and the 2 nd sensor unit include a non-contact sensor or an optical sensor.
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| JP2020-131993 | 2020-08-03 | ||
| JP2020131993A JP7362562B2 (en) | 2020-08-03 | 2020-08-03 | Passenger conveyor chain stretch detection device |
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| CN114057079A true CN114057079A (en) | 2022-02-18 |
| CN114057079B CN114057079B (en) | 2024-01-09 |
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| JP2022028525A (en) | 2022-02-16 |
| JP7362562B2 (en) | 2023-10-17 |
| CN114057079B (en) | 2024-01-09 |
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