JP2013049550A - Elevator door diagnostic system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator door diagnostic system capable of not only detecting a failure in an opening and closing operation of an elevator door appropriately but also grasping a place where the failure has occurred.SOLUTION: The elevator door diagnostic system includes: a current detector 3 for detecting a current flowing through an electric motor 2 that drives an opening and closing operation of a car door 6 that is the elevator door; a position calculation part 10 for calculating the position of the car door 6 between the open end and the closed end of the car door 6; a waveform measurement part 12 for measuring the waveform of the detected current for the calculated position; a normal waveform storage part 14 for storing the waveform of the detected current for the calculated position in a state that the car door 6 is opened and closed normally; a waveform comparison part 13 as a difference calculation means for calculating a difference in the result of comparison between the measured waveform and the stored waveform; an interval integration part 15 for acquiring a waveform by squaring the calculated difference and integrating the value for each interval; and an failure detection part 16 for detecting an failure in an opening and closing operation of the car door 6 on the basis of the waveform for which the interval integration has been made.

Description

  The present invention relates to an elevator door diagnostic apparatus for diagnosing a door opening / closing operation state in an elevator.

  2. Description of the Related Art Conventionally, an elevator car has been provided with a car door (elevator door) that is electrically opened and closed, and the car door is driven by an electric motor. Depending on the usage of the elevator, if foreign objects such as garbage get caught in the car door and the driving force (load state) of the car door increases, it will take time to open or close the car door, etc. Trouble will occur.

  Therefore, as a known technique for detecting whether there is an abnormality in the load state of such a car door, the current value of a drive motor (electric motor) for opening and closing the door is integrated, and this current integrated value is compared with a reference value, An “elevator door load state inspection device” (see Patent Document 1) that detects an abnormality in the load state of the door from the comparison result is cited.

JP 11-278777 A

  In the technique of Patent Document 1 described above, since the abnormality detection of the load state of the car door is performed only by the integrated value of the electric current value of the motor in the period from the start to the end of the car door drive, for example, the car door Even if there is a change in the operation, if the integrated values are the same, there is a problem that an abnormality cannot be detected, and it is impossible to determine where the abnormality has occurred in the car door.

  The present invention has been made to solve such problems, and the technical problem thereof is an elevator door diagnostic apparatus that can accurately detect an abnormality in the opening / closing operation of the elevator door and can also grasp an abnormality occurrence location. Is to provide.

  In order to solve the above technical problem, a first means of the present invention is an elevator door diagnostic apparatus for diagnosing an opening / closing operation of an elevator door driven by an electric motor, a current detecting means for detecting a current flowing through the electric motor, and an elevator Position calculating means for calculating the position of the elevator door between the open end and the closed end of the door, waveform measuring means for measuring the waveform of the detected current with respect to the calculated position, and the elevator door are normally opened and closed Based on the calculated difference, normal waveform storage means for storing the waveform of the detected current for the calculated position in the state, difference calculation means for calculating the difference between the measured waveform and the stored waveform, And an abnormality detection means for detecting an abnormality in the opening / closing operation of the elevator door.

  The second means is characterized in that, in the first means, the abnormality detecting means detects an abnormality in the opening / closing operation of the elevator door based on a waveform obtained by squaring and integrating the calculated difference.

  The third means is the second means, wherein the abnormality detection means opens and closes the elevator door when the section length of the section in which the magnitude of the waveform obtained by integration exceeds a predetermined value exceeds a predetermined length. It is characterized by determining abnormal operation.

  According to the elevator door diagnostic apparatus of the present invention, with respect to the current waveform of the motor corresponding to the position of the elevator door, the difference between the waveform actually measured by the waveform measuring unit and the normal waveform stored by the waveform storing unit is calculated. In order to detect an abnormality in the opening / closing operation of the elevator door based on the difference calculated by the means and the abnormality detecting means, the door load state abnormality detection is started after the door is driven as in Patent Document 1. The abnormality in the opening / closing operation of the elevator door can be detected more accurately than in the case where only the integrated value of the electric current value of the electric motor during the period until the completion is completed, and the abnormality occurrence point can be grasped.

It is the schematic block diagram which showed the basic composition of the elevator door diagnostic apparatus which concerns on Example 1 of this invention. It is the timing chart which showed an example of the waveform of the processing signal according to the opening / closing operation | movement of the elevator door in each part of the elevator door diagnostic apparatus shown in FIG. It is the timing chart which showed the other example of the waveform of the processing signal according to the opening / closing operation | movement of the elevator door in each part of the elevator door diagnostic apparatus shown in FIG.

  Hereinafter, an elevator door diagnostic apparatus according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic block diagram showing a basic configuration of an elevator door diagnostic apparatus according to Embodiment 1 of the present invention. The door opening / closing mechanism to be diagnosed by this elevator door diagnostic apparatus opens and closes a car door 6 of a car that is an elevator door, and includes a driving roller 4a and a driven roller 4b connected to the rotating shaft of the electric motor 2. A car door 6 for moving a landing door (not shown) in conjunction with the endlessly wound drive belt 5 is connected via a connecting member 20 and receives a command signal for door opening / closing from a control unit (not shown). The drive belt 5 is driven when the drive roller 4a rotates in accordance with the rotation of the rotating shaft of the electric motor 2 that is rotationally driven by the electric motor drive unit 11 as a door control unit, and the car door 6 is thereby opened and closed. It has become. The driving belt 5 and the driving roller 4a and the driven roller 4b in the door opening / closing mechanism can be applied as a link mechanism by substituting a flexible body such as a chain and a rotating body such as a sprocket.

  Further, the car is provided with a closed end detector 7 and an open end detector 8 for detecting the fully closed state and the fully open state of the car door 6, respectively. Further, an encoder 1 is connected to the rotating shaft of the electric motor 2, and the encoder 1 generates a pulse signal according to the rotation of the electric motor 2.

  The elevator door diagnostic apparatus is interposed between the electric motor 2 and the electric motor drive unit 11 and detects the current flowing through the electric motor 2 based on the electric motor current supplied from the electric motor drive unit 11 and the encoder 1. The position of the car door 6 between the open end and the closed end of the car door 6 is calculated between the detection timings of the closed end detector 7 and the open end detector 8 based on the pulse signal from the encoder 1. In the state where the position calculation unit 10 is connected to the current detector 3 and the position calculation unit 10 and the waveform measurement unit 13 which measures the waveform of the detected current with respect to the calculated position and the car door 6 is normally opened and closed. A normal waveform storage unit 14 for storing the waveform of the detected current at the calculated position of the difference between the measured waveform and the stored waveform, and a difference calculating means for calculating a difference between the measured waveform and the stored waveform A waveform comparator 13, a section integrator 15 that obtains a waveform obtained by squaring the calculated difference, and an abnormality detector 16 that detects an abnormality in the opening / closing operation of the elevator door based on the waveform obtained by integrating the sections, And a communication unit 17 that communicates the result of the abnormality detection.

  In the door opening / closing mechanism described above, when a door portion abnormality due to dust clogging or the like occurs in a door guide rail or a sill portion in a car not shown, the load of the motor 2 fluctuates from a normal value, and the motor current The elevator door diagnostic apparatus according to the first embodiment may cause troubles such as the car door 6 changing from the normal value and taking a long time to open or close, or causing the car door 6 to be opened or closed. It has a highly accurate diagnosis function that can accurately detect abnormalities in the opening and closing operation and grasp the location of abnormalities.

  In the elevator door diagnostic apparatus shown in FIG. 1, as a basic operation, the electric motor 2 is driven by the electric motor drive unit 11 from the state in which the car door 6 is closed, and when the electric motor 2 starts rotating, the encoder 1 and the driving roller 4a rotate. Accordingly, the car door 6 begins to open via the drive belt 5 and moves until it contacts the open end detector 8. At this time, the position calculation unit 10 counts the pulse signals from the encoder 1 to calculate the position of the car door 6. The waveform measuring unit 12 measures the motor current from the current detector 3 every time the car door 6 moves a predetermined minute distance according to the position signal calculated by the position calculating unit 10, and closes the car door 6. The operation waveform of the motor current with respect to the position of the car door 6 from the opening to the open end is created. As a minute distance here, the case where the value for every about 1 mm is set can be illustrated, for example.

  The normal waveform storage unit 14 stores an operation waveform of the motor current with respect to the position of the car door 6 between the closed end and the open end of the car door 6 when the car door 6 has been operating in a normal state in the past. Therefore, the waveform comparison unit 13 compares the waveform created by the waveform measurement unit 12 with the waveform stored in the normal waveform storage unit 14 and creates a difference waveform between them. The interval integrating unit 15 squares the current value of the difference waveform, converts the difference waveform that can be positive and negative values and zero into a square waveform that does not become a positive value and negative value that can be zero, and then sets the square value of the difference to a predetermined value. A section integrated waveform is created by integrating each section distance. Here, by squaring the difference waveform, it becomes possible to easily detect any abnormality regardless of the advance / delay of the car door 6 indicated by the positive / negative value of the difference, and it is integrated for each section distance. Thus, erroneous detection due to instantaneous movement can be prevented. In addition, as a section distance, the case where the value for every about 10 mm larger than the micro distance mentioned above is set can be illustrated.

  The abnormality detection unit 16 is at least one of an integrated value of the square of the difference indicated by the height of the interval integration waveform created by the interval integration unit 15 and a continuation distance indicated by the length of the interval in which the integration value continues to exceed a predetermined value. Based on the above, an abnormality in the opening / closing operation of the car door 6 is detected. The communication unit 17 has a communication function for notifying the outside such as an administrator room or a monitoring center when an abnormality is detected by the abnormality detection unit 16.

  FIG. 2 is a timing chart illustrating an example of a waveform of a processing signal corresponding to the opening / closing operation of the car door 6 in each part of the elevator door diagnostic apparatus according to the first embodiment. FIG. 2 shows a signal processing pattern when an abnormality occurs immediately after the car door 6 opens (when an abnormality occurs near the closed end), and the car door 6 from the closed end to the open end shown on the horizontal axis is shown. The normal waveform of the normal waveform storage unit 14 at the position, the measurement waveform calculated by the waveform calculation unit 12, the difference waveform calculated by the waveform comparison unit 13, the square waveform calculated by the interval integration unit 15, and the interval integration waveform are shown. ing.

  Referring to FIG. 2, in the signal processing pattern when an abnormality occurs in the vicinity of the closed end, the measured waveform is abnormally generated immediately after the opening operation with respect to the normal waveform, so that the position of the car door 6 is closed. When in the adjacent initial section, the current value increases from the normal value, indicating a high peak. For this reason, even in the differential waveform, the difference current value is larger than that in the other sections when it is in the same initial section. Moreover, since the square waveform is a value obtained by squaring the differential current value of the differential waveform, it shows a large peak value in the same initial section. Further, the section integrated waveform is a waveform obtained by integrating the square value of the difference current of the square waveform for each section distance B1, and shows a state in which the level A1 is reached in the same initial section. The anomaly detection unit 16 can be set to detect an anomaly when, for example, the continuation distance at which the size (integrated value) of the interval integrated waveform is equal to or higher than the level A1 is equal to or higher than the interval distance B1, The level A1 in the initial section that matches the distance B1 corresponds to the determination that the abnormality is detected.

  The elevator door diagnostic apparatus according to the first embodiment described above has the abnormality determination function of the abnormality detection unit 16 as described with reference to FIG. 2, so that dust is clogged at the closed end portion of the car in the door opening / closing mechanism. Even if an increase in load near the closed end due to wind pressure or the like causes an abnormality, a square waveform and a section integrated waveform are calculated based on a differential waveform that continuously changes with respect to the position of the car door 6. In order to detect the abnormality of the opening / closing operation of the car door 6 from the size of the section integrated waveform, it is possible to accurately detect the abnormality due to the factor in the opening / closing operation of the car door 6 regardless of the advance / delay of the car door 6. it can. Further, if the calculation result of the section integrated waveform is transmitted to, for example, a control device and displayed on a display screen of a display device attached or carried, it is possible to easily grasp the location where the abnormality has occurred.

  FIG. 3 is a timing chart showing another example of the waveform of the processing signal corresponding to the opening / closing operation of the car door 6 in each part of the elevator door diagnostic apparatus according to the first embodiment. FIG. 3 shows a signal processing pattern when an abnormality occurs in the middle of the car door 6 opening operation (when an abnormality occurs in the middle), and from the closed end shown on the horizontal axis as in FIG. The normal waveform of the normal waveform storage unit 14 at the position of the car door 6 up to the open end, the measured waveform calculated by the waveform calculation unit 12, the differential waveform calculated by the waveform comparison unit 13, and the square waveform calculated by the section integration unit 15 The section integrated waveform is also shown.

  Referring to FIG. 3, in the signal processing pattern in the case where an abnormality occurs in the middle, the measurement waveform is abnormal in the middle of the opening operation with respect to the normal waveform, so that the position of the car door 6 is changed from the closed end. The current value rises more slowly than the normal value when in the middle section B2 that is somewhat separated, reaches a peak value larger than the flat portion of the normal waveform, and then decreases to the normal value. Therefore, in the difference waveform, when the difference waveform value is in the same middle section B2, the difference current value shows a positive or negative value due to the difference in the change method between the measurement waveform and the normal waveform, and the absolute value is in other sections. Also shows a large value. Moreover, since the square waveform is a value obtained by squaring the differential current value of the differential waveform, it shows a clear positive peak value in the same midway section B2. Further, the section integrated waveform is a waveform obtained by integrating the square value of the difference current of the square waveform for each section distance B1, and shows a state in which the level A2 is reached in the same middle section B2. The anomaly detection unit 16 can be set to detect an anomaly when, for example, the continuation distance at which the size (integrated value) of the interval integrated waveform is greater than or equal to level A2 is equal to or greater than the interval distance B2. The level A2 of the midway section that matches the distance B2 corresponds to the determination that the abnormality is detected. Incidentally, in the setting of abnormality detection from the section integrated waveform in FIG. 3, the level A2 is set to a value smaller than the level A1 described in FIG. 2 in consideration of the actual condition of the abnormality that is likely to occur during the opening operation of the car door 6. The section distance B2 that matches the midway section is set to a larger value than the section distance B1 that matches the initial section described in FIG.

  The elevator door diagnostic apparatus according to the first embodiment described above has the abnormality determination function of the abnormality detection unit 16 as described with reference to FIG. 3, so that dust accumulates in the middle of the door traveling unit in the door opening / closing mechanism. Or a square waveform and a section integrated waveform are calculated based on a differential waveform that continuously changes with respect to the position of the car door 6 even if an increase in traveling load due to squeezing of dust or the like causes an abnormality. Since the abnormality of the opening / closing operation of the car door 6 is detected from the size of the section integrated waveform, it is possible to accurately detect the abnormality due to the factor in the opening / closing operation of the car door 6 regardless of the advance / delay of the car door 6. . Further, if the section integrated waveform is transmitted to, for example, a control device and displayed on a display screen of a display device attached or carried, it is possible to easily grasp the location where the abnormality has occurred.

  In short, according to the elevator door diagnostic apparatus according to the first embodiment, with respect to the current waveform of the electric motor 2 corresponding to the position of the car door 6, the waveform actually measured by the waveform measurement unit 12 and the normal stored by the normal waveform storage unit 14. The waveform detector 13 compares and calculates the difference from the time waveform, and the abnormality detector 16 performs the opening / closing operation of the car door 6 from the magnitude of the waveform integrated by the section integrator 15 based on the calculated difference. In order to detect an abnormality, an abnormality in the opening / closing operation of the car door 6 can be accurately detected both in the case where an abnormality occurs in the vicinity of the closed end described in FIG. In addition, it is possible to grasp the location where an abnormality has occurred. In addition, since the abnormality is determined by using the motor current that continuously changes with respect to the position of the car door 6, it is possible to detect a minute change in operation at each operation position of the car door 6. Since an abnormality can be detected before a major trouble occurs in the operation of the car, it is possible to prevent an elevator service from being stopped due to a malfunction of the car door 6. Furthermore, the abnormality detection unit 16 converts the differential waveform that can be a positive / negative value into a square waveform that indicates a positive value in order to detect an abnormality based on the magnitude of the interval integrated waveform obtained by integrating the square waveform of the difference waveform. By detecting an abnormality from the above, an abnormality can be easily detected, and an erroneous determination that determines that a differential waveform due to an instantaneous factor such as noise is abnormal is prevented, thereby improving the reliability of the abnormality determination. In addition, the abnormality detection unit 16 determines an abnormality based on the size of the section integrated waveform and the continuous distance (section distance) (that is, the size of the waveform and the section length of the section in which the waveform size exceeds a predetermined value). Therefore, the occurrence of abnormality due to various factors can be detected with high accuracy.

  In the elevator door diagnostic apparatus according to the first embodiment, the case where the square waveform of the difference waveform is used has been described. However, the difference waveform may be directly used. However, in such a case, it is necessary to set an abnormality determination reference value for each of the positive and negative values of the difference. Further, the traveling range of the car door 6 is divided into a plurality of sections, and the level of the integrated value and the continuous distance (section distance) of the section integrated waveform are set to different values for each section as an abnormality detection standard. Then, abnormality detection may be performed in a different form for each section. For example, in the closed end section of the car door 6, the level A1 and the section distance B1 related to the abnormality detection described with reference to FIG. 2 are used as a reference, and the abnormality detection described with reference to FIG. The case where it sets to the abnormality detection part 16 on the basis of level A2 and section distance B2 which concerns on can be illustrated. In such a case, since it is possible to detect an abnormality by setting a reference value according to the actual condition of an abnormality that is likely to occur in each section, it is possible to further improve the accuracy of the abnormality detection in the opening / closing operation of the elevator door. Can do.

DESCRIPTION OF SYMBOLS 1 Encoder 2 Electric motor 3 Current detector 4a Drive roller 4b Driven roller 5 Drive belt 6 Car door 7 Closed end detector 8 Open end detector 10 Position calculation part 11 Motor drive part 12 Waveform measurement part 13 Waveform comparison part 14 Normal waveform memory | storage part 15 Section Integration Unit 16 Abnormality Detection Unit 17 Communication Unit 20 Connecting Member

Claims (3)

In an elevator door diagnostic apparatus for diagnosing opening / closing operation of an elevator door driven by an electric motor,
Current detecting means for detecting a current flowing through the motor, position calculating means for calculating the position of the elevator door between the open end and the closed end of the elevator door, and the detected current with respect to the calculated position. Waveform measuring means for measuring a waveform, waveform storage means for storing a waveform of the detected current with respect to the calculated position in a state where the elevator door is normally opened and closed, the measured waveform and the storage An elevator door diagnostic apparatus comprising: difference calculating means for calculating a difference from the calculated waveform; and abnormality detecting means for detecting an abnormality in the opening / closing operation of the elevator door based on the calculated difference. .   The elevator door diagnostic apparatus according to claim 1, wherein the abnormality detection means detects an abnormality in the opening / closing operation of the elevator door based on a waveform obtained by squaring and integrating the calculated difference. Elevator door diagnostic device.   3. The elevator door diagnostic apparatus according to claim 2, wherein the abnormality detection unit is configured to detect the elevator door when a section length of a section in which the magnitude of the waveform obtained by the integration exceeds a predetermined value exceeds a predetermined length. An elevator door diagnostic apparatus characterized by determining an abnormality in the opening / closing operation of the elevator door.

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