WO2024099920A1 - Procédé de surveillance d'un mouvement rotatif d'un engrenage dans l'entraînement d'un escalier mécanique ou d'un trottoir roulant - Google Patents

Procédé de surveillance d'un mouvement rotatif d'un engrenage dans l'entraînement d'un escalier mécanique ou d'un trottoir roulant Download PDF

Info

Publication number
WO2024099920A1
WO2024099920A1 PCT/EP2023/080754 EP2023080754W WO2024099920A1 WO 2024099920 A1 WO2024099920 A1 WO 2024099920A1 EP 2023080754 W EP2023080754 W EP 2023080754W WO 2024099920 A1 WO2024099920 A1 WO 2024099920A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulse
gear
sensor
sensor signal
sensors
Prior art date
Application number
PCT/EP2023/080754
Other languages
German (de)
English (en)
Inventor
Alexander Prenner
Original Assignee
Inventio Ag
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Inventio Ag filed Critical Inventio Ag
Publication of WO2024099920A1 publication Critical patent/WO2024099920A1/fr

Links

Classifications

    • 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

Definitions

  • the present invention relates to a method for monitoring a rotary movement of a gear in the drive of an escalator. Furthermore, the invention relates to a signal processing device, a computer program and a computer-readable medium for carrying out the method as well as a sensor device and an escalator.
  • the rotational speed and/or direction of rotation of a gear wheel on an escalator can be monitored using two inductive sensors that are located opposite the gear teeth at different scanning points.
  • the number of pulses available to detect the respective movement parameter per revolution is limited by the number of sensors. Using more than two sensors does increase the number of pulses per revolution, i.e. the resolution of the resulting sensor signal, but on the other hand this can lead to signal irregularities that can lead to undesirable measurement inaccuracies despite the increased resolution.
  • a corresponding signal processing device a corresponding computer program, a corresponding computer-readable medium, a corresponding sensor device and a corresponding escalator.
  • a first aspect of the invention relates to a method for monitoring a rotary movement of a gear in the drive of an escalator.
  • the method comprises the following steps: receiving a sensor signal which is determined using at least a sensor for scanning the gearing, in a signal processing device; detecting pulses by scanning the sensor signal, wherein the pulses are counted by assigning a count value to each pulse, wherein each pulse is further assigned a time value which indicates a time interval of the pulse from the next pulse; carrying out the following steps for each detected pulse: selecting a reference time value by comparing the count value assigned to the detected pulse with a list which assigns reference time values to possible count values; determining a deviation of the time value assigned to the detected pulse from the selected reference time value; detecting from the deviation whether the gear is rotating at a desired speed.
  • the method can be computer-implemented and carried out automatically by a processor, for example a signal processing device of the escalator.
  • the method makes it possible to compensate for irregularities in the sensor signal, for example due to inaccuracies in the gear and/or the sensor and/or due to the so-called polygon effect in a chain drive.
  • the method allows for each detected pulse, i.e. for each tooth of the gearing for which a pulse was generated, to select a separate threshold value from several possible threshold values.
  • geometric irregularities of the gearing and/or other given inaccuracies for example in the alignment of an active surface of the sensor (sensor detection area) with the gearing and/or with each other (e.g. due to wear and/or temperature variations), can be taken into account in the monitoring, which significantly increases the accuracy and/or reliability of the monitoring compared to methods in which the same threshold value is used for all sections of the gearing.
  • the individual irregularities described above can result in a sensor signal in which long and short periods alternate regularly.
  • Such a long-short pattern can have a particularly severe impact on the measurement of the gear's rotational speed if the periods of the long-short pattern are compared with the same reference period regardless of their respective length.
  • Such irregularities can be effectively compensated using the method. For example, it can be detected that the gear is rotating too fast if the time value is less than the selected reference time value and/or rotating too slow if the time value is greater than the selected reference time value.
  • a control command to stop the escalator can be generated in an additional step.
  • Such a control command usually causes a safety circuit of the escalator to be interrupted.
  • time value can be understood as a time interval between two adjacent rising edges in the sensor signal.
  • the gear can be, for example, a sprocket of a chain drive of the escalator.
  • the chain drive can be designed to drive a step or pallet belt and/or a handrail of the escalator.
  • the teeth of the sprocket can be connected to a drive pinion of the escalator via a drive chain when the escalator is in working order.
  • the individual teeth of the sprocket can be used as a measuring embodiment for detecting the rotary movement.
  • an additional measuring embodiment is not necessary, which makes the escalator cheaper to manufacture.
  • a gear in the form of an additional measuring gear is also possible, which rotates when the escalator is in operation but does not transmit any driving forces itself.
  • a second aspect of the invention relates to a signal processing device with a processor that is configured to carry out the method described above and below.
  • the signal processing device can comprise hardware and/or software modules.
  • the signal processing device can comprise a memory and a data communication interface for wireless and/or wired data communication with peripheral devices.
  • the signal processing device can, for example, be part of an escalator control of the escalator. However, it can also be designed as a unit that is physically separate from the escalator. Of course, it is also possible for the signal processing device to be implemented in a data cloud (cloud and cloud computing) and to use decentralized hardware on the Internet.
  • a third aspect of the invention relates to a sensor device.
  • the sensor device comprises at least four sensors for scanning a toothing of a gear in the drive of an escalator at at least four scanning points, each sensor having an active surface and being mountable such that the active surface is opposite the toothing at the respective scanning point.
  • Each of these sensors is designed such that it emits an electrical pulse every time one of the teeth of the toothing passes the respective active surface.
  • the sensor device further comprises at least two outputs for connecting the sensor device to at least two inputs of a signal processing device (for example the signal processing device described above and below), a first of the outputs being connectable to a first of the inputs via a first signal line, a second of the outputs being connectable to a second of the inputs via a second signal line (separate from the first signal line), at least two of the sensors being connected to the first output for providing a first sensor signal and at least two further sensors being connected to the second output for providing a second sensor signal.
  • a signal processing device for example the signal processing device described above and below
  • Such a sensor device enables a significantly more precise and/or reliable measurement compared to designs with fewer than four sensors, for example with only two sensors or with only one sensor. This also makes it possible to check the correct functioning of the escalator by comparing the signals from both measuring channels.
  • the term “sensor” as used above and below may be understood to mean, for example, an inductive sensor, a Hall sensor, an optical sensor or a combination of at least two of these examples.
  • the sensors of the sensor device can therefore be of the same type or of different types. If the sensors are inductive sensors, the inductive sensors can differ from one another in their oscillation frequency, for example. This can prevent the sensors from interfering with one another during operation. The inductive sensors can also have the same oscillation frequency.
  • the sensors can be mounted such that the active surfaces have different positions with respect to a circumferential direction of the gear.
  • the sensors can each be mounted using a special holder.
  • a special holder can be designed to enable precise alignment of the active surface of the respective sensor in three spatial directions, i.e. in the x, y and z directions, relative to the gearing.
  • the method described above and below may further comprise: generating the first sensor signal and/or the second sensor signal by the sensor device described above and below.
  • the first sensor signal provided at the first output of the sensor device and/or the second sensor signal provided at the second output of the sensor device may be suitable for being processed using the method described above and below.
  • a fourth aspect of the invention relates to an escalator.
  • the escalator comprises: a drive with a gear; at least one sensor for sensing a toothing of the gear at at least one sensing point, the sensor having an active surface and being mounted such that the active surface is opposite the toothing at the sensing point, the sensor being designed to emit an electrical pulse each time one of the teeth of the toothing passes the active surface; and the signal processing device described above and below.
  • the escalator can comprise the sensor device described above and below, wherein each sensor of the sensor device is mounted such that the active surface of the respective sensor is opposite the toothing at the respective scanning point.
  • the computer program comprises instructions which cause a processor of a signal processing device to carry out the method described above and below when the computer program is executed by the processor.
  • the computer-readable medium may be a volatile or non-volatile data storage device.
  • the computer-readable medium may be a hard disk, a universal serial bus (USB) storage device, a random-access memory (RAM), a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a flash memory, or a combination of at least two of these examples.
  • the computer-readable medium may also be a data communications network that enables downloading of program code (e.g., over the Internet), or a cloud.
  • Embodiments of the invention may be considered based on the ideas and findings described below. These embodiments are not to be construed as limiting the scope of the invention.
  • the counting of the pulses can be started from when the count value of the last detected pulse matches a stop value that indicates a number of pulses within a pulse pattern repeating in the sensor signal.
  • the counting can be started from the beginning by resetting a counter for counting the pulses to a starting value, for example to 0 or 1.
  • the counting is then continued from the starting value, with the counter being increased incrementally, for example by the value 1, for each pulse detected until the stop value is reached again.
  • the counting can be carried out continuously while the escalator is in operation.
  • the set of possible count values that can be assigned to the detected pulses is not indeterminate, but limited to certain count values.
  • the set of possible count values can include values for counting to four (e.g. "0, 1, 2, 3" or "1, 2, 3, 4") if the repeating pulse pattern includes four consecutive pulses.
  • the repeating pulse pattern can be a known pulse pattern with a known number of pulses.
  • the known pulse pattern can, for example, result from the configuration of a chain drive of the escalator that has the gear wheel. It is also possible that the pulse pattern was determined in tests or in one or more separate long-distance runs before or parallel to the normal operation of the escalator.
  • the stop value can be equal to 2.
  • the repeating pulse pattern comprises exactly two consecutive pulses.
  • the stop value can also be significantly greater than 2.
  • the stop value can be equal to a number of teeth on the gear (or an integer multiple thereof) and/or equal to a number of links on the drive chain (or an integer multiple thereof).
  • the stop value can be equal to a number of pulses generated by sampling the sensor signal using the sensor or sensors during one or more complete revolutions of the gear and/or drive chain in the same direction.
  • the pulse pattern changes during operation of the escalator, for example due to temperature fluctuations or increasing wear. It is therefore useful to automatically scan the sensor signal for repeating pulse patterns and determine a corresponding stop value from this.
  • the method may further comprise a step in which a repeating pulse pattern is detected by sampling the sensor signal.
  • the pulses may be repeated taking into account the detected pulse pattern can be detected. This enables automatic detection of repeating pulse patterns in the sensor signal.
  • the sensor signal can be scanned for rising and/or falling edges.
  • detection can be carried out, for example, every time the escalator starts and/or during normal operation of the escalator (e.g. at regular intervals and/or when certain events are detected).
  • Detection can, for example, take place during a long-distance run of the escalator in which the gear wheel is rotated by 360 degrees or by an integer multiple of 360 degrees in the same direction.
  • the gear wheel can also be rotated by less than 360 degrees during the long-distance run.
  • the detected pulse patterns can, for example, differ from one another in at least one of the following ways: the number of pulses, the time intervals between pulses, and the total duration. Accordingly, a separate list with count values and reference time values can be generated for each detected pulse pattern. One of these lists can then be automatically selected to evaluate the sensor signal, for example depending on the current operating conditions of the escalator. It is therefore possible to switch between the different lists several times while the escalator is in operation. It is also conceivable for the sensor signal to be evaluated simultaneously using several such lists. This creates a certain degree of redundancy, which improves the reliability of the process.
  • the stop value can indicate a number of pulses within the detected pulse pattern.
  • it can be determined, among other things, how many pulses the pulse pattern consists of and a corresponding stop value can be set (for example, with four pulses, a stop value "4" for a count from 1 to 4 or a stop value "3" for a count from 0 to 3). This enables the stop value to be automatically updated when a new pulse pattern is detected, for example as a result of temperature fluctuations and/or increasing wear.
  • the detection of the pulse pattern may include: counting the pulses within the pulse pattern by assigning a count value to each pulse; determining a time value for each pulse within the pulse pattern, wherein the time value indicates a time interval of the pulse to the next pulse.
  • the method may further comprise: determining a reference time value for each count value that was assigned to a pulse upon detection of the pulse pattern by multiplying the time value of the respective pulse by a factor; storing the reference time values together with the respective count values in the list.
  • a number of possible count values that are later used to count the pulses, and the associated reference time values can be determined from the sensor signal. If, for example, the count values "1, 2, 3, 4" (or “0, 1, 2, 3") were assigned one after the other when the pulse pattern was recognized, then when the pulses are recognized the count is up to the count value 4 (or 3) before counting starts again from 1 (or 0). In other words, each count ends after the fourth pulse, i.e. the stop value is 4 (or 3) and corresponds to the number of pulses within the recognized pulse sequence. For each of the above-mentioned count values, a specific reference time value is stored in the list. The above steps can be carried out during a learning phase outside of normal operation of the escalator and/or parallel to normal operation of the escalator.
  • the detected pulse pattern can be used to identify properties of the respective chain drive of the escalator, for example to determine whether the escalator is equipped with the correct chain drive.
  • the factor can, for example, be between 0.80 and 0.95, preferably 0.90.
  • the method may further comprise a step in which it is determined whether the recognized pulse pattern is plausible by comparing a total duration of the recognized pulse pattern with a reference duration.
  • the recognized pulse pattern is retained if it is plausible and/or discarded if it is not plausible.
  • the sensor signal can be re-sampled in response to discarding the pulse pattern to detect a repeating pulse pattern.
  • the total duration of the detected pulse pattern can be measured and/or calculated.
  • the total duration is determined by adding the time values of the pulses within the detected pulse pattern.
  • the reference duration can, for example, be a quotient of a distance travelled by the gear during the total duration of the detected pulse pattern (i.e. when counting the pulses until the respective stop value is reached) and the desired speed of the gear, or can be determined depending on this quotient.
  • the detected pulse pattern may be classified as implausible if the total duration is outside a certain tolerance range (e.g. plus/minus 1%, plus/minus 5% or plus/minus 10%) around the reference duration.
  • a certain tolerance range e.g. plus/minus 1%, plus/minus 5% or plus/minus 10%
  • the sensor signal can be generated using at least two sensors for scanning the gear teeth at different scanning points, in particular by superimposing output signals from the at least two sensors over the same period of time.
  • the accuracy of the method can be significantly increased compared to embodiments with only one sensor.
  • the sensor signal was generated in such a way that the pulses in the sensor signal do not overlap in time. This enables a clear determination of the number and length of the pulses.
  • the sensor signal (generated using the at least two sensors) can be a first sensor signal and a second sensor signal, which was generated using at least two further sensors, in particular by superimposing output signals of the at least two further sensors over the same period of time, can be received in the signal processing device. Both sensor signals can have been generated in such a way that each pulse in the first sensor signal partially overlaps in time with a pulse in the second sensor signal. Accordingly, the method can further comprise: determining a current direction of rotation of the gear by evaluating the first sensor signal together with the second sensor signal and/or using the second sensor signal to detect whether the gear is rotating at the desired speed.
  • the direction of rotation can be determined, for example, by a characteristic sequence of rising and/or falling edges of pulses in a superposition of the two sensor signals over the same period of time or, in other words, based on a characteristic sequence of overlapping pulses of the two sensor signals.
  • a control command to stop the escalator can be generated in an additional step.
  • the second sensor signal can be processed in the same or similar way as the (first) sensor signal.
  • the two sensor signals can be processed in parallel for this purpose, creating a certain degree of redundancy. This has the advantage that speed monitoring still works with sufficient accuracy even if one of the two sensor signals fails or is disrupted for some reason.
  • the sensors of the sensor device can be mounted in such a way that the active surfaces have the same position in relation to an axial direction of the gear.
  • the active surfaces can be located one behind the other in the circumferential direction of the gear.
  • the active surfaces can also partially overlap in the circumferential direction of the gear. Such a linear arrangement of the active surfaces can be advantageous for reasons of space.
  • the sensors can be mounted such that at least two of the active surfaces each have a first position and at least two further active surfaces each have a second position deviating from the first position with respect to an axial direction of the gear.
  • the gear is a duplex gear with a first toothing and a second toothing, the teeth of which are aligned with the teeth of the first toothing in the axial direction of the gear, then, for example, the active surfaces of the first toothing in the first position and the active surfaces of the second toothing in the second position can be opposite each other.
  • the sensors whose active surfaces each have the first position are connected to the first output of the sensor device, while the sensors whose active surfaces each have the second position are connected to the second output of the sensor device.
  • the sensors whose active Surfaces having different positions with respect to the axial direction can be connected to the same output.
  • the first positions can be offset from each other in the circumferential direction of the gear by more than one whole tooth pitch (p) of the gear.
  • the second positions can be offset from each other in the circumferential direction of the gear by more than one whole tooth pitch (p) of the gear.
  • the respective offset can be, for example, at least 1.01p, at least 1.1p or at least 1.5p.
  • the respective offset can be less than twice the entire tooth pitch, for example at most 1.99p, at most 1.9p or at most 1.6p. This has the effect that the pulses from the respective sensors (which can be connected to the same output, for example) do not overlap in time. This enables the number and frequency of the pulses to be clearly determined.
  • the first positions in the circumferential direction of the gear can have the same distance from each other as the second positions.
  • each first position can be offset from one of the second positions in the circumferential direction of the gear by less than a whole tooth pitch (p) of the gear, in particular by less than half a tooth pitch of the gear.
  • the offset can be, for example, 0.99p or less, 0.9p or less, in particular 0.49p or less, or 0.4p or less.
  • an offset of between 1 mm and 5 mm, in particular 3 mm has proven to be particularly favorable. This has the effect that the pulses of a sensor whose active surface has the first position partially overlap in time with the pulses of a sensor whose active surface has the second position offset from the first position. This enables, for example, the detection of a current direction of rotation of the gear (see also above).
  • Fig. 1 shows an escalator according to an embodiment of the invention.
  • Fig. 2 shows a sensor device according to an embodiment of the invention.
  • Fig. 3 shows a sensor device according to an alternative embodiment of the invention.
  • Fig. 4 shows sections of sensor signals as they are processed in a method according to an embodiment of the invention.
  • Fig. 1 shows an escalator 1 with a chain drive 3 for driving a step belt 5 and a handrail 7 of the escalator 1.
  • the chain drive 3 comprises a drive pinion 9, which is connected via a drive chain 11 to a gear 13 in the form of a chain wheel.
  • the gear 13 can be a main drive wheel, which is connected via a shaft to a first drive wheel for driving the step belt 5 and a second drive wheel for driving the handrail 7.
  • the drive pinion 9 can be driven by an electric motor.
  • a gear can be arranged between the drive pinion 9 and the electric motor to transmit rotational movement and torque.
  • the escalator 1 comprises a sensor 15 for scanning a toothing 17 of the gear 13 at a scanning point 18 and a signal processing device 19 for processing a sensor signal 21 that was generated using the sensor 15.
  • the sensor 15 can be, for example, an inductive sensor, a Hall sensor, an optical sensor or a combination of at least two of these sensor examples.
  • the sensor 15 is arranged such that its active surface 23 is opposite the toothing 17 at the scanning point 18 at a certain distance. Every time one of the teeth of the toothing 17 passes the active surface 23, the sensor 15 generates an electrical pulse 25 (see Fig. 4).
  • the sensor signal 21 can be a Output signal of the sensor 15. Alternatively, the sensor signal 21 can be based on the output signal.
  • the escalator 1 can alternatively comprise a sensor device 27 with a plurality of sensors for scanning the toothing 17 at a plurality of scanning points 18, here with a first sensor 15a, a second sensor 15b, a third sensor 15c and a fourth sensor 15d (Fig. 2 and Fig. 3 each show a toothed section of the gear 13 in plan view, wherein the head surfaces 28 of the individual teeth are directed against the plane of the drawing).
  • the four sensors 15a, 15b, 15c, 15d can be mounted, for example, such that their active surfaces 23 are opposite the same side of the gearing 17, here one of the side flanks of the gearing 17.
  • the active surfaces 23 can have essentially the same position with respect to an axial direction y of the gear 13 and can be located one behind the other at a certain distance in the circumferential direction x of the gear 13.
  • the distance in the x-direction between adjacent active surfaces 23 is here greater than a whole tooth pitch p and smaller than twice the tooth pitch p.
  • An arrangement is also conceivable in which the distance is greater than 2p or smaller than p, for example smaller than 0.5p, in particular smaller than 0.25p.
  • the sensors 15a, 15b, 15c, 15d are arranged here such that - viewed in the x-direction - the active surface 23 of the sensor 15b lies between the active surfaces 23 of the sensors 15a, 15c and the active surface 23 of the sensor 15c lies between the active surfaces 23 of the sensors 15b, 15d.
  • Fig. 3 shows a variant in which the gear 13 is designed as a duplex gear with a first toothing 17a and a second toothing 17b, wherein the teeth of the first toothing 17a are aligned with the teeth of the second toothing 17b in the y-direction (axially).
  • the two toothings 17a, 17b can match each other in their geometric properties.
  • the active surfaces 23 of the sensors 15a, 15c are opposite a side of the first toothing 17a having the head surfaces 28, while the active surfaces 23 of the sensors 15b, 15d are opposite a side of the second toothing 17b having the head surfaces 28.
  • the active surfaces 23 opposite the first gear 17a may be those of the sensors 15a, 15b and the active surfaces 23 opposite the second gear 17b may be those of the sensors 15c, 15d.
  • the active surfaces 23 can also be opposite a side flank of the respective toothing 17a or 17b.
  • the active surfaces 23 opposite the first toothing 17a each have a first position in the y-direction.
  • the active surfaces 23 opposite the second toothing 17b each have a second position in the y-direction that differs from the first position.
  • the first positions in the x-direction have the same distance from each other as the second positions. However, the distances can also differ from each other.
  • every second position in the x-direction is offset by less than half a tooth pitch p from one of the first positions.
  • the offset can be between 1 mm and 5 mm, for example. In tests with common gear types, an offset of 3 mm proved to be particularly suitable for obtaining sensor signals that can be easily evaluated.
  • the four sensors 15a, 15b, 15c, 15d can, for example, be mounted on a common plate 29 as a holder, in particular screwed into it, whereby the plate 29 should be adjustable at least in the x and y directions relative to the gear 13.
  • a radial distance (relative to a rotation axis of the gear 13 (not shown)) of each active surface 23 to the teeth 17a or 17b can be adjusted by screwing the respective sensor 15a, 15b, 15c or 15d more or less deeply into the plate 29.
  • the plate 29 can be radially adjustable as a whole.
  • the first sensor 15a and the third sensor 15c are connected to a first output 30a of the sensor device 27 to form a first measuring channel for providing a first sensor signal 21, wherein the second sensor 15b and the fourth sensor 15d are connected to a separate second output 30b the sensor device 27 to form a second measuring channel for providing a second sensor signal 31.
  • the first output 30a is connected via a first signal line to a first input 32a of the signal processing device 19.
  • the second output 30b is connected via a separate second signal line to a second input 32b of the signal processing device 19.
  • the sensor signal 21 or 31 can be a superposition of the output signals of different sensors of the same measuring channel over the same period of time, here a first output signal 21a or 31a with a second output signal 21b or 31b (see also Fig. 4).
  • each sensor 15a, 15b, 15c, 15d can be connected at its output to its own input of the signal processing device 19. In this case, there are four measuring channels.
  • the signal processing device 19 may comprise a processor 33 and a memory 35 in which a special computer program is stored.
  • the processor 33 may be configured to carry out a method for monitoring a rotational movement of the gear 13 by executing the computer program, as will be described in more detail below.
  • the sensor signal 21 is received in the signal processing device 19.
  • the sensor signal 21 is sampled to detect pulses 25 (see Fig. 4).
  • the first sensor signal 21 can be sampled for rising edges, for example.
  • the detected pulses 25 are counted by assigning a count value 37 to each pulse 25, or more precisely to each period comprising a pulse 25, with the count value 37 being increased each time a new pulse 25 is detected (here by 1).
  • a time value 39 is determined for each detected pulse 25, which indicates a time interval between the pulse 25 and the next pulse, i.e. a duration of the respective period.
  • a reference time value 41 (see Fig. 2) is determined by comparing the count value 37 with a list 43 which assigns a reference time value 41 to each count value 37.
  • the list 43 can be stored in the memory 35.
  • the deviation is ultimately used to detect whether the gear 13 is rotating at a desired speed. For example, it is detected that the gear 13 is rotating too quickly if the time value 39 is smaller than the selected reference time value 41, or that it is rotating too slowly if the time value 39 is larger than the selected reference time value 41.
  • the signal processing device 19 can generate a control command in an additional step which causes the escalator 1 to be transferred to a safe state. This is usually achieved by interrupting a safety circuit of the escalator 1, which causes the escalator 1 to stop.
  • the counting of the pulses 25 can be continued until the count value 37 of the last counted pulse 25 matches a predefined stop value 45. The counting then starts again from a predefined start value 47 (here at «1»).
  • the stop value 45 indicates after how many consecutive pulses 25 a certain pulse pattern 49 repeats in the sensor signal 21.
  • the pulse pattern 49 comprises four consecutive pulses 25.
  • the stop value 45 is therefore “4”.
  • the pulse pattern 49 can be detected, for example, by evaluating the sensor signal 21.
  • the pulse pattern 49 can be a known pulse pattern that can be known, among other things, from the geometric properties of the gear 13 or the chain drive 3. Sensory detection of the pulse pattern 49 is therefore not absolutely necessary.
  • the detection of the pulse pattern 49 may include the following steps.
  • the pulses 25 within the recognized pulse pattern 49 are counted by assigning a count value 37 to each pulse 25.
  • the count value 37 (here "4") of the last pulse 25 is stored as the stop value 45.
  • a time value 39 is determined for each pulse 25 within the recognized pulse pattern 49.
  • a reference time value 41 is determined for each count value 37 that has been assigned to one of the pulses 25 of the recognized pulse pattern 49, for example by multiplying the time value 39 of the respective pulse 25 by a certain factor (here by 0.90).
  • the resulting reference time values 41 are then stored together with the respective count values 37 in the list 43.
  • the detected pulse pattern 49 is plausible by comparing its total duration, i.e. the sum of all time values 39 related to the pulse pattern 49, with a reference duration.
  • the reference duration can be determined experimentally and/or calculated, for example by dividing a distance corresponding to the number of pulses 25 within the pulse pattern 49 by the desired speed of the gear 13.
  • the pulse pattern 49 is only used further if it is plausible. Otherwise, the pulse pattern 49 is discarded.
  • the sensor signal 21 can then be sampled again, for example, in order to detect a pulse pattern 49.
  • Such a learning phase can last at least until a repeating pulse pattern is detected with sufficient accuracy.
  • the list 43 can be kept up to date.
  • each list 43 ie the number of value pairs consisting of a count value 37 and a reference time value 41
  • the number of entries in each list 43 corresponds to the number of periods within the respective pulse pattern. In the simplest case, the number of periods is two. However, the number of periods can also be equal to the number of teeth on gear 13 (or an integer multiple thereof) or equal to a product of the number of teeth on gear 13 and the number of chain links on drive chain 11 and/or another chain on chain drive 3 (or an integer multiple thereof).
  • Such a method offers the possibility of precise overspeed measurement with the shortest possible response time, even when the sensor signal 21 is highly non-uniform.
  • Each individual pulse 25 can be used for the overspeed measurement, i.e. after each individual pulse 25 a decision can be made as to whether the escalator 1 should be stopped or not. False shutdowns of the escalator 1 as a result of unevenly distributed pulses 25 within a pulse pattern 49 can thus be avoided by the present method.
  • the speed monitoring steps described above and below using the example of the (first) sensor signal 21 can additionally be carried out in the same (or similar) manner using the second sensor signal 31.
  • the special arrangement of the active surfaces 23 shown in Fig. 3 has the effect that both sensor signals 21, 31 are generated in such a way that each pulse 25 in the first sensor signal 21 partially overlaps in time with a pulse 25 in the second sensor signal 31 (see Fig. 4).
  • This circumstance can be used to detect in an additional step whether the gear 13 is rotating in a desired direction. If the gear 13 does not rotate in the desired direction, a control command to transfer the escalator 1 to a safe state can be generated in an additional step, as with speed monitoring.

Landscapes

  • Escalators And Moving Walkways (AREA)

Abstract

L'invention concerne un procédé de surveillance d'un mouvement de rotation d'un engrenage (13) dans l'entraînement (3) d'un escalier mécanique (1), comprenant : la réception d'un signal de capteur (21), qui a été généré à l'aide d'un capteur (15) pour balayer des dents (17, 17a, 17b) de l'engrenage (13), dans un dispositif de traitement de signal (19) ; la détection d'impulsions (25) par balayage du signal de capteur (21), les impulsions (25) étant comptées par attribution d'une valeur de comptage (37) à chaque impulsion (25), chaque impulsion (25) étant également attribuée à une valeur de temps (39) qui indique un intervalle de temps entre l'impulsion (25) et l'impulsion suivante (25) ; la réalisation des étapes suivantes pour chaque impulsion détectée (25) : sélectionner une valeur de temps de référence (41) en comparant la valeur de comptage (37) attribuée à l'impulsion détectée (25) à une liste (43) qui attribue des valeurs de temps de référence (41) à des valeurs de comptage possibles (37) ; déterminer un écart de la valeur de temps (39) attribuée à l'impulsion détectée (25) à partir de la valeur de temps de référence (41) sélectionnée ; sur la base de l'écart, détecter si l'engrenage (13) tourne à une vitesse souhaitée.
PCT/EP2023/080754 2022-11-08 2023-11-06 Procédé de surveillance d'un mouvement rotatif d'un engrenage dans l'entraînement d'un escalier mécanique ou d'un trottoir roulant WO2024099920A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP22206026.1 2022-11-08
EP22206026 2022-11-08

Publications (1)

Publication Number Publication Date
WO2024099920A1 true WO2024099920A1 (fr) 2024-05-16

Family

ID=84330322

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2023/080754 WO2024099920A1 (fr) 2022-11-08 2023-11-06 Procédé de surveillance d'un mouvement rotatif d'un engrenage dans l'entraînement d'un escalier mécanique ou d'un trottoir roulant

Country Status (1)

Country Link
WO (1) WO2024099920A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4664247A (en) * 1984-04-30 1987-05-12 Westinghouse Electric Corp. Conveyor brake control
EP1850087A1 (fr) * 2006-04-25 2007-10-31 Prüftechnik Dieter Busch Ag Procédé et dispositf destiné à surveiller l'extension d'une chaîne d'entraînement
US20120283870A1 (en) * 2009-04-20 2012-11-08 Alois Senger Conveyor safety control

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4664247A (en) * 1984-04-30 1987-05-12 Westinghouse Electric Corp. Conveyor brake control
EP1850087A1 (fr) * 2006-04-25 2007-10-31 Prüftechnik Dieter Busch Ag Procédé et dispositf destiné à surveiller l'extension d'une chaîne d'entraînement
US20120283870A1 (en) * 2009-04-20 2012-11-08 Alois Senger Conveyor safety control

Similar Documents

Publication Publication Date Title
DE3880299T2 (de) Verfahren zum Messen von Zahnradfehlern durch Abwälzen und Maschine dafür.
EP2549257B1 (fr) Procédé de détection de dommages sur des engrenages
DE102009016257B4 (de) Wälzfräser
EP3347295B1 (fr) Installation de transport de passagers ayant un dispositif destiné a determiner l'état de fonctionnement
EP0382115A2 (fr) Système de contrôle pour une transmission à courroie
DE102017104884B4 (de) System und Verfahren zum Bestimmen von Fehlerbildern aus Sensordaten in Produktvalidierungs- und Fertigungsprozessen
DE102016113149A1 (de) Aufnahme von Entfernungsprofilen
EP1674832B1 (fr) Roue dentée munie d'un codage de rotation inverse destinée à un capteur d'arbre à manivelle ou d'arbre à cames
DE3538309C2 (fr)
DE102016113702A1 (de) Geschwindigkeitsdetektion unter Verwendung von mehreren Verarbeitungspfaden
EP2649416B1 (fr) Procédé et dispositif pour une transmission numérique cyclique d'une valeur de position d'un objet se déplaçant, pourvu d'une masse d'inertie
WO2024099920A1 (fr) Procédé de surveillance d'un mouvement rotatif d'un engrenage dans l'entraînement d'un escalier mécanique ou d'un trottoir roulant
EP0504578B1 (fr) Procédé et dispositif pour contrôler des chenilles d'un véhicule en operation de mouvement
DE2627131A1 (de) Automatische, zyklisch arbeitende maschine zur konditionierung prismatischer erzeugnisse
WO1998050772A1 (fr) Dispositif pour la mesure complete des dentures d'engrenages, y compris de la topographie des flancs des dents
EP1583215B1 (fr) Méthode et dispositif pour contrôler un moteur électrique
DE2627209C3 (de) Gerät zur Registrierung der zurückgelegten Lastzyklen von umlaufenden Maschinen
DE3314601C2 (fr)
DE102019113300B3 (de) Verfahren zum Betrieb eines elektromechanischen Nockenwellenverstellers
EP1468782A1 (fr) Méthode et appareil pour determiner automatiquement le diamètre d'un outil en forme de disque entrainé par un moteur
DE3601197A1 (de) Drehgeber
DE102021100751B3 (de) Verarbeitungsvorrichtung und Verfahren zum Verarbeiten eines Sensorsignals eines Sensors für ein Fahrzeug und Sensorsystem mit einem Sensor und einer Verarbeitungsvorrichtung
DE102018216225A1 (de) Verfahren zur Erkennung von Fehlern in einem Zahnstangengetriebe
EP1954861B1 (fr) Procede et dispositif de determination de la quantite de fil sur une machine a tricoter
EP1672347B1 (fr) Procédé et dispositif destinés à la réalisation d'une mesure sur un accouplement à griffes

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23800854

Country of ref document: EP

Kind code of ref document: A1