JP2011026013A - Door control device of elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain a malfunction based on a secular change in a door sensor. <P>SOLUTION: This door control device of an elevator has a door driving means 12 for driving a door of the elevator, a light projector 4 arranged in one of opposed surfaces of the door and a light receiver 5 arranged on the optical axis of the other light projector of the opposed surfaces, and a door sensor control means 9 for controlling the light projector and the light receiver, and controls opening-closing of the door by detecting an obstacle existing between the opposed surfaces of the door. The door sensor control means drives the door for opening or closing, and determines a distance between the light projector and the light receiver when light receiving output of the light receiver becomes a preset threshold value, and compares the determined distance with a preset distance, and determines the secular deterioration in the light projector or the light receiver. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an elevator door control device, and more particularly, to an elevator door control device capable of suppressing erroneous detection of an obstacle.

  When the elevator door is closed, for example, a photoelectric door sensor is provided to detect whether there are obstacles such as passengers or luggage between the closed doors. Opening and closing is controlled (see Patent Document 1). In such an elevator door control device, it is possible to prevent malfunctions such as erroneous detection or detection omission based on surface contamination of the projector and light receiver constituting the photoelectric door sensor, or a decrease in luminous intensity in the optical axis of the projector, It is desirable to minimize elevator out of service.

  As described above, in the conventional door control device in which the door of the elevator is provided with a photoelectric door sensor and the opening and closing of the door is controlled while judging the presence or absence of an obstacle, the surface contamination of the projector or the receiver or the projector In order to prevent a malfunction due to a decrease in luminous intensity in the optical axis, a maintenance staff responded by cleaning the sensor surface during periodic inspection.

JP 2001-294387 A

  The period until the surface of the light projector or light receiver constituting the door sensor is contaminated differs depending on the environment where the elevator is installed. For this reason, it is practically difficult to clean the sensor surface at an appropriate time. Even when the elevator installation environment is good and the maintenance staff frequently cleans the sensor surface, if the light intensity on the optical axis of the projector decreases, the light receiver cannot obtain the necessary amount of light received. In such a case, the door sensor cannot operate stably and a malfunction occurs.

  The present invention has been made in view of these problems, and provides a door control device capable of suppressing malfunctions based on secular changes of door sensors.

  In order to solve the above problems, the present invention employs the following means.

  Door driving means for driving an elevator door, a projector provided on one of the opposing surfaces of the door, a receiver provided on the optical axis of the other projector on the opposing surface, and the projector and the receiver In an elevator door control device that includes door sensor control means for controlling, and that controls the opening and closing of the door by detecting an obstacle between the opposing surfaces of the door, the door sensor control means opens or closes the door. Driving, the distance between the light projector and the light receiver when the light reception output of the light receiver becomes a preset threshold value, and comparing the obtained distance with the preset distance, Determine deterioration.

  Since this invention is provided with the above structure, the malfunction based on the secular change of a door sensor can be suppressed.

It is a figure explaining embodiment of this invention. It is a figure which shows the light reception amount change characteristic with respect to the distance between sensors. It is a figure which shows the light reception amount change characteristic with respect to the distance between sensors.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a diagram illustrating an embodiment of the present invention. In FIG. 1, 1 is an elevator car, 2 is a door that opens and closes oppositely, a projector 4 is attached to one of the opposing doors 2a, and a light receiver 5 is attached to the other door 2b. ing.

  Reference numeral 9 denotes door sensor control means for controlling the light projector 4 and the light receiver 5. The door sensor control means 9 is a light reception amount detection means 6 for detecting the light reception amount of the light receiver 5, and a comparison determination means for comparing the detected light reception amount with a threshold value. 7 and sensor control means for controlling the projector 4, the light receiver 5, the received light amount detection means 6 and the comparison determination means 7.

  10 is a door control means for outputting a door opening / closing command, 11 is a storage means for storing a measurement result, 12 is a door driving means for opening / closing the door according to an opening / closing command from the door control means, and 13 is a projector 4 and a light receiver 5. This is a sensor-to-sensor distance measuring means for measuring the distance between the sensors.

  Reference numeral 14 denotes an external contact means for notifying the occurrence of a failure or the like to an external contact 15 such as an administrator room or a control center in accordance with a control signal from the door control device 10.

  FIG. 2 is a diagram illustrating a light reception amount change characteristic with respect to a distance between sensors in a normal operation state. In the case of normal operation, the comparison / determination unit 7 compares the detection value of the received light amount detected by the received light amount detection unit with the threshold value of the received light amount. The sensor control means 8 adjusts the luminous intensity of the optical axis 3 irradiated by the projector 4 or the amplification degree of the amplification circuit constituting the received light amount detection means 6 so that the result of the comparison becomes a predetermined value or more.

  For this reason, as shown in FIG. 2, the curve 16 representing the amount of received light (detected output of the received light amount detecting means 6) with respect to the distance between the sensors is held above the threshold value.

  FIG. 3 is a diagram illustrating a light reception amount change characteristic with respect to a distance between sensors in a diagnostic operation performed when the sensor surface is contaminated. The diagnostic operation is an operation performed to detect dirt on the surface of the projector 4 or the light receiver 5, or a decrease in luminous intensity of the optical axis 3 irradiated from the projector 4, and the amount of light received with respect to the distance between the sensors by this operation. Detect change characteristics of

  During the diagnostic operation, first, the sensor control means 8 sets the light intensity of the projector 4 and the amplification degree of the received light amount detection means to a minimum. In this state, when the received light amount detected by the received light amount detecting means 6 is compared with the threshold value 17 by the comparison determining means 7, the received light amount change curves 18 and 19 with respect to the distance between the sensors are obtained as shown in FIG. This curve shows a tendency that the amount of received light decreases as the distance between the sensors becomes longer.

  The sensor control means 8 outputs a sensor threshold value coincidence detection signal when the amount of received light coincides with the threshold value, and the intersensor distance measurement means 13 measures the intersensor distance when the sensor coincidence detection signal is received, and the measurement result (L2) is stored in the storage means 11. Further, by comparing this measurement result with the initial value (L1) stored in the storage means 11, it is possible to detect contamination on the surface of the light projector 4 or the light receiver 5 or a decrease in luminous intensity of the optical axis 3.

  When the elevator is installed, a diagnostic operation is performed at the start of the operation. During the diagnostic operation, the door control unit 10 outputs a diagnostic operation start signal to the sensor control unit 8. In addition, a command to open the door 2 at a low speed from the closed state is output to the door driving means 12. As a result, the door 2 is opened at a low speed by the door driving means 12.

  The sensor control means 8 sets the light intensity of the projector 4 and the amplification degree of the light receiver 5 to the minimum, and when the light reception amount for each distance between the sensors is detected by the light reception amount detection means 6 in this state, for example, the light reception amount shown in FIG. A change curve 18 can be obtained.

  The sensor control means 8 outputs a sensor coincidence detection output to the door control means 10 when the comparison judgment means 7 detects the coincidence between the output of the received light amount detection means 6 and the threshold value 17. The inter-sensor distance measuring unit 13 measures the inter-sensor distance L1 at the timing when the door control unit 10 receives the sensor coincidence detection output. This measurement result is stored in the storage means 11.

When the operation of the elevator is started and a predetermined period elapses, the diagnosis operation is performed. In the diagnostic operation, the door 2 is opened at a low speed by the door driving means 12 and the light intensity of the projector 4 and the amplification degree of the light receiver 5 are set to the minimum in this state, as in the case of the elevator installation described above. The received light amount is detected by the received light amount detecting means 6 to obtain, for example, a received light amount change curve 19 shown in FIG.

  The sensor control means 8 outputs a sensor coincidence detection output to the door control means 10 when the coincidence between the output of the received light amount detection means 6 and the threshold value 17 is detected. The inter-sensor distance measuring unit 13 measures the inter-sensor distance L2 at the timing when the door control unit 10 receives the sensor coincidence detection output, and the measurement result is stored in the storage unit 11.

  The door control means 10 compares the distance L2 between the sensors stored in the storage means 11 with the distance L1 between the sensors, thereby causing a failure such as dirt on the surface of the projector 4 or the light receiver 5 or a decrease in luminous intensity on the optical axis of the projector. The element can be detected. Thereby, it is possible to prevent erroneous detection of the sensor by performing appropriate maintenance, and it is possible to suppress the deterioration of serviceability as much as possible.

  Further, the external communication means 14 is connected to the door control means 10 and the comparison result, for example, the contamination of the surface of the projector 4 or the light receiver 5 or the failure of the light intensity on the optical axis of the projector is reduced via the external communication means. The presence of an element can be reported to the outside. This makes it possible to respond more quickly and improve serviceability.

  As described above, according to the present embodiment, a change in the amount of received light with respect to the distance between the sensors is detected and compared with an initial value to detect dirt on the surface of the projector or the receiver, a decrease in luminous intensity of the optical axis, or the like. be able to. Moreover, malfunctioning of the sensor can be prevented by performing appropriate maintenance based on the detection result. Thereby, the door control apparatus of the elevator which suppressed the fall of serviceability as much as possible can be provided.

  Further, by adding an external communication means, it is possible to notify an external contact such as an administrator or a control center of a sign of a failure due to contamination on the surface of the projector or the light receiver or a decrease in the light intensity of the optical axis. Accordingly, it is possible to provide a quick response, and it is possible to provide an elevator door control device with higher safety and serviceability.

DESCRIPTION OF SYMBOLS 1 Car 2 Door 3 Optical axis 4 Light projector 5 Light receiver 6 Light reception amount detection means 7 Comparison determination means 8 Sensor control means 9 Door sensor control device 10 Door control means 11 Storage means 12 Door drive means 13 Intersensor distance measurement means 14 External communication Means 15 External contact

Claims (3)

Door driving means for driving the door of the elevator, a projector provided on one of the opposing surfaces of the door, a receiver provided on the optical axis of the other projector on the opposing surface, and the projector and the receiver In an elevator door control device that includes door sensor control means for controlling, and detects an obstacle between opposing surfaces of the door to control opening and closing of the door,
The door sensor control means drives the door to open or close, calculates a distance between the light projector and the light receiver when the light reception output of the light receiver reaches a preset threshold value, and sets the calculated distance in advance. A door control device for an elevator characterized by determining aged deterioration of a projector or a light receiver in comparison with the measured distance. The elevator door control device according to claim 1,
An elevator door control device comprising an external reporting unit, and reporting aged deterioration determination result to the outside through the unit. The elevator door control device according to claim 1,
The elevator door control device characterized in that the preset distance is an initial value of the distance between the light projector and the light receiver when the light reception output of the light receiver reaches a preset threshold value.

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