JP5206295B2 - Elevator door safety device - Google Patents

Description

  The present invention relates to an elevator door safety device that prevents a car from traveling while foreign objects such as long strings, ropes, cords, etc. are sandwiched in an elevator door, and in particular, a failure that continues to detect foreign objects. It relates to failure detection when it occurs.

  In general, an elevator door is provided with a gate switch for detecting the open / closed state of the elevator door and a closed end detection switch for detecting that the door has reached the door closed end. After confirming that it has been closed, the elevator starts operation. Conventionally, a door safety device that uses a safety shoe, a photoelectric sensor, an ultrasonic sensor, or the like is well known as a door safety device that detects a passenger being caught in an elevator door or detects the passenger entering or leaving the car.

  However, it is difficult for these door safety devices, the above-described gate switches, and the like to reliably detect that a foreign object such as an elongated string, a rope, or a cord is caught in the door. For this reason, for example, if the passenger closes with a dog connected by a string and the door closes with one on the landing and the other in the car, the elevator will start running with the string still sandwiched in the door. There is a risk of serious accidents.

  In order to prevent such a situation, a foreign object detection device that operates by pressure on the door contact surface of an elevator car door is used as a door safety device that detects that a foreign object such as an elongated string, rope, or cord is caught in the door. One provided (for example, see Patent Document 1), or one provided with a light projecting means on one of the upper and lower sides of the elevator doorway near the door when the door is fully closed (for example, a patent) Various things have been proposed such as Document 2).

  On the other hand, if a safety device such as a photoelectric device provided in the vicinity of the elevator entrance is operated continuously, the door open state continues and the elevator becomes unusable, so if the safety device continues to operate for a certain time or more, the safety device Is provided with a forced door closing means for forcibly closing the door (see, for example, Patent Document 3 or Patent Document 4).

JP 2004-262636 A JP 2008-169209 A JP-A-11-29284 JP 2007-168962 A

  As described in Patent Document 1 or Patent Document 2, in a door safety device provided with a foreign object detection device that detects that a foreign object such as an elongated string, rope, or cord is sandwiched between doors, When the door is in a state where it continues to detect foreign objects that do not actually exist, the door continues to open and the elevator cannot travel. It can be considered that the foreign object detection device to be detected is disabled and the door is forcibly closed.

However, if such a foreign object detection device continues to detect the presence of a foreign object, does it really indicate the presence of a foreign object, or some failure, for example, a projector or receiver failure, dust or dirt on the projector or receiver If there is a reflector in addition to the light emitter / receiver, etc., it cannot be distinguished whether it is due to a reflector failure or dirt, electrical circuit failure or disconnection, dust clogging on the door sill, etc. There has never been an effective means to distinguish this. For this reason, if the operation of the elevator is continued without determining that the foreign object detection device is broken, the door is opened for a long time each time the elevator stops on the floor, and the operation efficiency of the elevator is extremely deteriorated. In addition, even if a string or rope is actually caught in the door, it may lead to a very dangerous situation where it cannot be detected.
In addition, as in Patent Document 3 and Patent Document 4 described above, if forced door closing that invalidates all door opening requests is performed, forced door closing is interrupted even if a string or rope is actually caught. Cannot be done, and can be extremely dangerous.

  The present invention has been made in view of the above problems, and when a situation in which the foreign object detection device continues to detect foreign objects occurs, the foreign object detection device is temporarily disabled and the door is closed at low speed. If the closing is repeated a predetermined number of times, it is very unlikely that a string or rope is actually caught in the door, so it is judged early that some failure has occurred in the foreign object detection device. An object of the present invention is to provide an elevator door safety device capable of taking measures.

The present invention provides an elevator equipped with a foreign object detection device that detects that a foreign object such as a string or a rope is caught in a door, and the foreign object detection device detects the foreign object when the door is closed, and the door is inverted a predetermined number of times. When it is repeated, it is determined that the foreign object detection device has failed if the foreign object detection device is temporarily disabled and the low speed door closing means for closing the door at a low speed and the low speed door closing operation by the low speed door closing device are repeated a predetermined number of times. And a failure determination means.

The present invention continues at an elevator foreign matter such as string or rope provided with a foreign matter detecting device for detecting that caught in the door, before Symbol foreign object detecting device opening state of the door by detecting a foreign substance for a predetermined time or more Then, when the foreign object detection device is temporarily disabled and the low speed door closing means for closing the door at a low speed and the low speed door closing operation by the low speed door closing means are continuously repeated a predetermined number of times, it is determined that the foreign object detection device has failed. And a failure determination means.

  According to the present invention, when the foreign object detection device continues to detect foreign objects for some reason, and as a result, low-speed door closing is performed, the foreign object detection device malfunctions when the low-speed door closing occurs continuously a predetermined number of times. It is possible to detect the failure of the foreign object detection device at an early stage and take countermeasures for it, and it is caused by continuing the operation of the elevator in a state where it cannot be determined that the foreign object detection device has failed. It is possible to avoid a dangerous situation in which the operation efficiency is deteriorated and the passenger continues to operate the elevator without noticing the failure of the foreign object detection device.

  In addition, when the low-speed door is closed, a door opening request other than the foreign object detection device is responded. Therefore, when a string or rope is actually caught, the passenger who notices this is operated by operating the door opening button, etc. The low-speed door closing can be interrupted, and the door can be reversed and the dangerous situation of starting traveling after the low-speed door closing with the string or rope sandwiched between the doors can be avoided.

Embodiment 1 FIG.
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
FIG. 1 is a diagram showing an overall configuration of an elevator door safety device according to Embodiment 1 of the present invention, and FIG. 2 is a diagram illustrating a processing procedure of a portion of the elevator control device according to the present invention in the door safety device of FIG. It is a flowchart of.

  In FIG. 1, 1 is an elevator car, 2 is a car door, 3 is a door driving device comprising a motor or the like for driving the car door 2, and 4 and 5 are light projecting means and light receiving means as foreign matter sensors. 4 is a central portion of the entrance / exit, and is provided on the lower surface of the transom or in the vicinity thereof, and the light receiving means 5 is provided on or near the sill, and a light beam or a laser beam is irradiated from the light projecting means 4 to the light receiving means 5 when necessary. Here, an example is shown in which a foreign matter detection device is constituted by these light projecting / receiving units 4 and 5 and a foreign matter determining means described later. The presence of foreign matter is obstructed by blocking the light beam or laser beam from the light projecting unit 4. It comes to detect.

6 is a car operation panel, 7 is a door open button, 8 is a door close button, 9 is a car call button, and 10 is a notification device for notifying various guidance displays and voice guidance. Reference numeral 20 denotes an elevator control device that controls the operation of the elevator, and outputs a signal from the foreign object detection device and the door opening / closing button, and other door opening / closing command signals according to the operating state of the elevator, and the like. 22. Elevator control means 23 for performing elevator elevator control, display guidance control means 24 for controlling the notification device 10 such as various guidance displays and voice guidance, communication means 25 for communicating with the outside, Foreign matter determination means 26 that detects the presence of foreign matter by the light receiving means 5 not receiving the light beam or laser beam from the light means 4, repeated reversal door opening is repeated a predetermined number of times by foreign matter detection, or the door open state is predetermined by foreign matter detection If the time continues, the low-speed door closing means 27 that temporarily disables foreign object detection and outputs a low-speed door closing command, and the low-speed door closing that disables foreign object detection continues to be predetermined. The door opening / closing command for outputting a door opening / closing command according to a signal from the failure determining means 28, the foreign object determining means 26, the door opening / closing buttons 7 and 8 and other elevator operating conditions, etc. It comprises command means 29 and the like.
30 is a door motor control device that controls the door motor of the door drive device 3 in response to a door opening / closing command signal from the elevator control device 20, 31 is a public line such as a general telephone line, 32 is a public line 31 for maintenance and monitoring of the elevator and the like It is a monitoring center that is performed remotely from outside.

  Next, the operation of the elevator door safety device according to the present invention will be described based on the flowchart of FIG.

In this flow, when an elevator arrives at any floor in response to a call and starts opening the door, or when there is no call and the door is waiting to close at any floor, the hall call button on that floor is operated to start the door opening. Then start.
First, in step S1, the number of times that the low-speed door closing that temporarily disables the foreign object detection device is performed is set as M, and is read from a memory (not shown) that stores this. Note that the initial value of M is 0. When the door begins to open and the door opening is completed, the door maintains the door open state (step S2).

Next, in step S3, it is determined whether or not the reverse door opening has already been repeated a predetermined number of times by foreign matter detection by the foreign matter detection device, or whether or not the door open state has continued for a predetermined time by foreign matter detection by the foreign matter detection device. In this case, the process proceeds to step S4.
In step S4, it is determined whether or not a foreign object has been detected by the foreign object detection device. If a foreign object is detected, the process returns to step S2 to maintain the door open state. If no foreign object is detected, step S5 is performed. Then, it is determined whether or not the door opening time has expired. When the door opening time has expired, the routine proceeds to step S6, where the door closing is started at a normal operation (normal speed).

In step S7, it is determined whether or not the gate switch is closed and the door is closed. If the door is still being closed, the process proceeds to step S8 to determine whether or not the foreign object detection device has detected a foreign object. . If a foreign object is detected, the process proceeds from step S8 to step S10, the door is reversed and the process returns to step S2. Even if a foreign object is not detected, even when there is a door opening request other than the foreign object detection by the foreign object detecting device, such as the operation of a safety shoe (not shown) or the operation of the door opening button 7, the process goes from step S9 to step S10. The door is reversed and the door is opened, and the process returns to step S2. If there is no foreign object detection or other door opening request during the door closing operation, the normal door closing operation is continued. When the door closing is completed, the process proceeds from step S7 to step S11. , M is still at the initial value 0) and is updated and stored, that is, when the door closing is completed by a normal door closing operation, M is reset to 0 and this flow is ended.
At the end of this flow, the elevator is ready to start running, and if there is a call to be answered, it starts to run. Will be prepared for the occurrence of

  On the other hand, when the foreign object detection device continues to detect foreign objects and repeats the opening of the reverse door a predetermined number of times through S10 described above or continues to be determined as YES in step S4, the door open state continues for a predetermined time. The determination in step S3 is YES, and the process proceeds from step S3 to step S12. In step S12, it is determined whether or not the door opening time has expired. If the door opening time has not expired, the process returns to step S2, but if the door opening time has expired, the process proceeds to step S13 and the foreign object detection by the foreign object detection device is closed. The door is closed at a low speed while the notification device 10 performs notification by, for example, temporarily disabling until completion and sounding a buzzer. In step S14, it is determined whether or not the low-speed door closing is completed. If not yet, in step S15, there is a door opening request other than the foreign object detection by the foreign object detection device, for example, an operation of the door opening button 7 or the like. In step S16, the low-speed door closing is interrupted, the reverse door opening is performed, and the process returns to step S2. If not, the process returns to step S13 to continue the low-speed door closing. When the low-speed door closing is thus completed, a new value of M is set as M = M + 1 in step S17 (in this case, since the original M is 0, 1 is added thereto, and the new value of M becomes 1). Is updated and stored.

  In step S18, it is determined whether or not M = 3. That is, it is determined whether or not the low-speed door closing that disables the foreign object detection device has been performed three times in succession, with the predetermined number of times being three. To do. At this point, M is still 1 and the determination in step S16 is NO. Therefore, the flow is finished as it is, and the elevator is ready to start running. If there is a call to be answered, run toward that call. When there is no call to be answered, the door-opening standby is performed as it is to prepare for the generation of a new call.

  In this way, the elevator again arrives at an arbitrary floor in response to a call, or the landing call button on that floor is operated while there is no call and the door is closed, and when the door is opened, the flow of FIG. 2 starts again. In step S1, the value of M is read again from the memory, but since this time is updated and stored as M = 1, M = 1 and step S2 and subsequent steps are executed. If the state where the foreign object detection device continues to detect foreign objects has been resolved for some reason during the previous low-speed door closing or after the low-speed door closing, the normal door closing operation is performed by executing steps S2 to S10. When the door closing is completed, the process proceeds from step S7 to step S11, where M is reset to 0 and updated and stored. That is, in this case, the door is normally closed and the cause of the low-speed door closing is eliminated, so that M = 0 is reset and this flow is ended.

  On the other hand, if the foreign object detection device continues to detect foreign objects even though the elevator has moved to another floor after the previous low-speed door closure or entered the door-closing standby state, The possibility that a string or rope is caught in the door is very low, and it is highly likely that the foreign object detection device is out of order. In this case, the reverse door opening is repeated again by executing Steps S2 to S10, or the door The open state continues for a predetermined time, and thereafter, similarly to the previous time, the process proceeds from step S3 to step S12, and the low-speed door closing is performed again in step S13. When the low-speed door closing is completed, the process proceeds from step S14 to step S17, 1 is added to the original M, and this time, M = 2, and this new value of M is updated and stored.

  If the same procedure is repeated in this manner and the foreign object detection device continues to detect the foreign object, it will eventually reach the third low-speed door closing. = 3. As a result, the determination in step S18 is YES, and the process proceeds to step S19, where it is determined that the foreign object detection device has failed. After determining that the foreign object detection device has failed, the process proceeds to door control at the time of failure in step S20, and thereafter door control and display guidance control are performed according to the operation procedure at the time of this failure.

  As an example of door control or display guidance control based on the operation procedure at the time of failure, for example, when it is determined that the foreign object detection device has failed, a notification to that effect is sent to the monitoring center 32 via the public line 31, and a maintenance inspector arrives. Until it is restored, the foreign object detection device is disabled and the operation of the elevator is continued. However, while the foreign object detection device is disabled, a message to that effect is displayed appropriately in the car and at the landing, and when the door is closed, a warning is always given to the passenger with voice guidance, a buzzer, etc. as in the case of the low-speed door closing in step S13 described above. It may be possible to close the door at low speed while informing.

  As described above, according to the present invention, when the state in which the foreign object is detected for some reason continues even though there is no foreign object, the foreign object is detected because the low-speed door closing is continuously performed a predetermined number of times. Since the detection device is judged to be faulty, it is possible to detect a failure where the foreign matter detection device continues to detect foreign matter at an early stage and take countermeasures. Various inconveniences caused by continuing the operation of the elevator can be solved.

  In addition, when the door is open other than the foreign object detection by the foreign object detection device, the reverse door is opened while the low speed door is closed, so if the string or rope is actually caught, the passenger will notice this The low-speed door closing can be interrupted by operating the door open button, etc., and the door can be reversed, and the dangerous situation of starting running with the string or rope caught in the door after the low-speed door closing can be avoided. .

Other Embodiments In the above embodiment, the criterion for determining a failure of the foreign object detection device is M = 3, that is, when forced door closing is performed three times continuously, of course, the predetermined number of times is two or less. It may be set or may be set to four times or more.

  In the above-described embodiment, M = 0 is reset only when the normal door closing is completed. However, the state of the foreign matter sensor is constantly monitored (regardless of whether the foreign matter detection device is valid or invalid). When a non-existent state (a state where light is not shielded by a foreign object) is detected even for a moment, or when a predetermined time is detected, such as when the light receiver is in a light-receiving state even for a moment during irradiation toward the light receiver May be considered to have solved the failure of the foreign object detection device (the failure to continue detecting foreign objects), and at that time, M = 0 may be reset. Similarly, the status of the foreign matter sensor is monitored even during door control at the time of failure, and if the state where no foreign matter is present is detected even for a moment, or if it is detected for a predetermined time, it is considered that the failure of the foreign matter detection device has been resolved. However, normal door control may be restored.

  In the above embodiment, the case where the doorway is a double-open door is described as an example, but it goes without saying that the present invention can be similarly applied to a case of a single-open door. Yes.

  Further, in the above embodiment, the foreign object detection device has the light projecting means and the light receiving means arranged above and below the car doorway. However, the present invention is not limited to this. It may be one that has been used, or other devices using pressure sensors, mechanical devices, or devices that are detected by a combination of multiple devices and sensors, such as strings and ropes near the fully closed door Any object can be used as long as it can detect the foreign matter.

  In addition, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.

It is a figure which shows the whole structure of the door safety device of the elevator in Embodiment 1 of this invention. 2 is a flowchart for explaining a processing procedure of a portion according to the present invention of an elevator control device in the door safety device of FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Car 2 Car door 3 Door drive device 4 Light projection means 5 Light receiving means 6 Car operation panel 7 Door open button 8 Door close button 9 Car call button 10 Notification device 20 Elevator control device 26 Foreign object judgment means 27 Low speed door close means 28 Failure Judgment means 30 Door motor control device 31 Public line 32 Monitoring center

Claims (5)

In an elevator equipped with a foreign object detection device that detects that a foreign object such as a string or rope is caught in the door, when the foreign object detection device detects the foreign object when the door is closed and repeats the reverse door opening of the door a predetermined number of times, A low-speed door closing unit that temporarily disables the foreign object detection device and closes the door at a low speed, and a failure determination unit that determines that the foreign object detection device has failed when the low-speed door closing operation by the low-speed door closing unit is repeated a predetermined number of times. And an elevator door safety device. An elevator having a foreign matter detecting system foreign matter such as string or rope detects that caught in the door, the prior Symbol foreign object detecting device opening state of the door by detecting the foreign matter continues for a predetermined time or longer, the foreign substance detecting A low-speed door closing means for temporarily disabling the apparatus at a low speed, and a failure determination means for determining that the foreign object detection apparatus has failed when the low-speed door closing by the low-speed door closing means is continuously repeated a predetermined number of times. An elevator door safety device characterized by comprising: 3. The elevator door safety device according to claim 1, wherein when the low-speed door closing means closes the door at a low speed, if there is a door opening request other than the foreign object detection device, the reverse door is opened. . The elevator door safety device according to any one of claims 1 to 3, wherein when the failure determination means determines that the foreign object detection device has failed, the operation of the elevator is continued by door control at the time of failure. 5. The elevator door safety device according to claim 4, wherein when the foreign object detection device detects a state in which no foreign object exists while the operation by the door control at the time of the failure is continued, the elevator door safety device is returned to the normal operation.

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