JP2012030899A - Device for monitoring elevator door - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator door monitoring device, which is capable of determining whether the amount of deposits such as dust deposited on a doorsill or door rail exceeds a threshold, without the operation of a terminal switch.SOLUTION: The elevator door monitoring device detects abnormal conditions by determining that the amount of deposits such as dust deposited on the doorsill or door rail has exceeded the threshold. The device includes a reversal distance measuring unit (10a) for measuring a distance returned from a door opening and closing edge when the door is closed, and an abnormal condition detecting unit (10a) for determining the abnormal conditions when the reversal distance has exceeded a predetermined value.

Description

  The present invention relates to an elevator door operation abnormality detection technique, and more particularly, to a technique related to an elevator door monitoring device that prevents an original door opening / closing operation from being disabled due to dust accumulated on a sill or door rail.

  As a device of this type, conventionally, the amount of movement by which the door moves due to inertia after the end switch operates when the door is opened and closed, and when the amount of movement from the end switch is below a predetermined value, 2. Description of the Related Art An elevator monitoring device is known that determines that an abnormality has occurred in an opening / closing operation due to dust accumulation or the like and transmits an abnormality signal (see, for example, Patent Document 1).

JP-A-4-308177 (paragraph number 0015, FIG. 3)

  However, in the prior art disclosed in Patent Document 1 described above, since an abnormality is detected based on the amount of movement of the door after the termination switch at the door opening / closing end is operated, the bolt is loosened or worn over time. When the operation position of the terminal switch is displaced, there is a problem that an abnormality cannot be accurately determined.

  The present invention has been made based on the actual situation in the above-described prior art, and its purpose is to determine whether or not the accumulation amount of dust or the like accumulated on the sill or door rail exceeds the threshold without being based on the operation of the termination switch. The object is to provide an elevator door monitoring device that can handle the above.

  In order to achieve the above object, the present invention provides an elevator door monitoring device for detecting an abnormality by determining that dust or the like accumulated on a sill or a door rail has exceeded a threshold value. Inverted distance measuring means for measuring the pushed-back distance and abnormality detecting means for determining that an abnormality occurs when the inverted distance exceeds a predetermined value are provided.

  In the present invention configured as described above, the phenomenon that the door is reversed by dust or the like accumulated on the sill or the door rail is measured, and when the door is closed, the distance that the door is pushed back from the open / close end is measured, and the reverse distance is a predetermined value. When the value exceeds the threshold, it is determined that the accumulation amount of dust or the like accumulated on the sill or the door rail exceeds the threshold value. As a result, it is possible to detect an abnormality without being based on the operation of the termination switch as in the prior art.

  According to the present invention, the reversal distance when the door is pushed back from the open / close end is detected, and when this reversal distance exceeds a predetermined value, the accumulation amount of dust or the like accumulated on the sill or the door rail has a threshold value. By determining that it has exceeded, it is possible to detect the abnormality with high accuracy over time, thereby improving the reliability of the elevator apparatus.

It is a schematic block diagram which shows one Example of the door monitoring apparatus of the elevator of this invention. It is a block diagram of the door monitoring apparatus in a present Example. It is a control processing flowchart of the door monitoring apparatus in a present Example.

  Embodiments of an elevator door monitoring apparatus according to the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the elevator includes a door motor 1, a rotary encoder 2 that generates a pulse signal in synchronization with the door motor 1, is used as a position detector, a door drive belt 3 that is driven by the door motor 1, and a door. A door rail 4 extending in parallel with the drive belt 3, a door panel 5 disposed at the doorway, a door hanger 6 that is attached to the upper end of the door panel 5 and suspends the door panel 5 on the door rail 4, and a door hanger A hanger roller 7 that is fixed to the door 6 through a shaft and rotates on the door rail 4 in the door opening / closing direction, a sill 8 that guides the lower end of the door panel 5, and the control of the elevator, the outside, that is, the monitoring center 9 And a control device 10 that transmits and receives information. Reference numeral 11 denotes a deposit such as dust deposited on the door rail 4.

  Further, as shown in FIG. 2, the control device 10 includes a control microcomputer 10a and an inverter 10b, and performs normal door opening / closing control, determination of door position based on a pulse signal output from the rotary encoder 2, Opening / closing door confirmation based on a termination switch signal output from a termination switch (not shown) disposed at each door opening / closing end, door inversion distance measurement according to the present invention, inversion distance and set value, that is, a predetermined value Comparison, abnormality detection, and the like. Each of the reversal distance measuring means for measuring the distance that the door is pushed back from the open / close end when the door is closed, and the abnormality detecting means for judging that the reversal distance exceeds a predetermined value are, for example, It consists of a control microcomputer 10a of the control device 10. 2 similar to those shown in FIG. 1 described above are denoted by the same reference numerals.

  In general, when an elevator is used, dust in the air accumulates on the sill 8 and the door rail 4. Further, the dust on the door rail 4 tends to be gathered to the open / close end by the hanger roller 7 as the door is opened and closed, and is fixed as a deposit 11. When this deposit 11 increases, the hanger roller 7 once rides on the deposit 11 due to the inertia of the door at the open / close end, and then the hanger roller 7 is pushed back when the door motor 1 is de-energized, causing the door to reverse. start. Furthermore, if the deposits 11 increase, the door will not be fully closed, which may hinder the original opening / closing operation of the door. Therefore, it is necessary to determine that the deposits 11 have exceeded the threshold before such a state is reached. . Therefore, the present invention utilizes the door reversal phenomenon described above, and when the reversal distance is equal to or greater than a predetermined value, for example, 2.0 mm, dust or the like on the sill 8 or door rail 4, that is, the deposit 11 has a threshold value. An abnormality is detected by judging that it has accumulated beyond.

  Here, the control process of the door monitoring apparatus will be described with reference to FIG. The control processing shown here is performed by the control microcomputer 10a in the control device 10.

  In step S1 of FIG. 2, when the door opens and closes, such as when the elevator arrives at the destination floor or when the open button is pressed, in step S2, in the case of the door opening operation, a door open end terminating switch (illustrated) Check if the door is fully open, and if the door is closed, check if the door is closed with the door closing end switch (not shown). Although it is not necessary to check the terminal switch at the door opening / closing end, the terminal switch is checked here for the purpose of preventing erroneous detection when the door is reversed due to a passenger hitting the door during opening and closing. Next, in step S3, the door inversion distance at the door opening / closing end is measured, and in step S4, it is determined whether or not the door inversion distance is a predetermined value, that is, 2.0 mm or more. Note that the door reversal distance is obtained by calculating the difference between the maximum value of the door movement distance and the stop position after the door stops in the door position detection. Here, if the reversal distance of the door is greater than or equal to a predetermined value, for example, the hanger roller 7 that has once climbed on the deposit 9 on the door rail 4 is pushed back or the door panel 5 is pushed back by foreign matter in the sill 8. In step S5, an abnormality is detected. If the door reversal distance is less than the predetermined value, the process is terminated without detecting any abnormality. When the process proceeds to step S5 and an abnormality of the door is detected, the abnormality is reported to the monitoring center 9 at step S6. Thereby, the monitoring center 9 can recognize the abnormality of the door, and the engineer can be dispatched to the site to remove the abnormality of the door.

  According to the present embodiment, the reversal distance when the door is pushed back from the open / close end is detected, and the accumulated amount of dust or the like accumulated on the sill 8 or the door rail 4 when the reversal distance exceeds a predetermined value. Therefore, it is possible to detect an abnormality with high accuracy over time, thereby improving the reliability of the elevator apparatus.

DESCRIPTION OF SYMBOLS 1 Door motor 2 Rotary encoder 3 Door drive belt 4 Door rail 5 Door panel 6 Door hanger 7 Hanger roller 8 Sill 9 Monitoring center 10 Control apparatus 10a Control microcomputer (reverse distance measurement means, abnormality detection means)
10b Inverter 11 Deposit

Claims (1)

In an elevator door monitoring device that detects that an accumulation amount of dust or the like accumulated on a sill or door rail has exceeded a threshold,
An elevator comprising: an inversion distance measuring unit that measures a distance by which the door is pushed back from the open / close end when the door is closed; and an abnormality detection unit that determines that an abnormality occurs when the inversion distance exceeds a predetermined value. Door monitoring device.

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