JPH06100277A - Safety device for elevator door - Google Patents

Abstract

PURPOSE:To prevent the malfunction of a safety device by providing a sensor for detecting a passenger near an elevator-stop without contact, and storing the position, where an elevator-stop door is detected, on the basis of the output of the sensor at the time of opening the door, and changing an elevator-stop door detecting area for nullifying the output of the sensor at the time of closing the door. CONSTITUTION:When an elevator cage responds a call and the door opening command is generated from an elevator control board 1, the speed pattern corresponding to a point of the door position is read from a ROM 3 to a CPU 4A, and the torque command is output to a PWM unit 5. A motor 8 is driven by the gate signal from a gate signal generating circuit 6 to start to open the door, and when a human body sensor 13 is not obstructed by the landing door with the door opening, the sensor output is gradually reduced. In this case, a position, where the landing door is detected, is stored, and a landing door detecting area for nullifying the output of the sensor at the next time of door closing is changed in response to the stored position to prevent the malfunction in the case where the human body sensor 13 is not fitted appropriately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator door safety device which detects a passenger near a doorway without contact while the door of the elevator door is closed and inverts or stops the door so as not to be caught in the door. It is a thing.

[0002]

2. Description of the Related Art A conventional elevator door safety device will be described with reference to FIGS. FIG. 4 is a diagram showing a configuration of a conventional safety device for an elevator door. Further, FIG. 5 is a timing chart showing a door closing operation of a conventional elevator door safety device.

Door drive control will be described with reference to FIGS. 4 and 5 by taking a door closing operation as an example. When a door closing command is generated from the elevator control panel 1, it is read into the input / output port 2 and, in response to this door closing command, the ROM 3 is read in FIG.
The speed pattern 1a shown in (a) is read into the CPU 4. The speed pattern 1a is read as follows. First, the output pulse from the pulse encoder 9 attached to the motor 8 is the pulse count unit 1
It is counted by 0 and the count value is sent to the CPU 4. Then, the CPU 4 calculates the position point of the door from the pulse count value, and reads the speed pattern 1a corresponding to the position point from the ROM 3.

The pulse output from the pulse encoder 9 not only finds the position point of the door, but also the CPU 4 calculates the rotation speed (rotation speed 2a) of the motor shown in FIG. 5A based on the count value. I am going together.

The CPU 4 uses the read speed pattern 1a.
A torque command that causes the motor speed 2a to follow the speed pattern 1a is sent to the PWM unit 5, where it is converted into a PWM signal, and the gate signal is generated from the gate signal generation circuit 6 by the PWM signal. The circuit 7 is driven and the motor 8 is rotated to control the speed.

The door control circuit (the portion surrounded by the alternate long and short dash line in FIG. 4) is also provided with a RAM 11 for storing the position of the door, the rotation speed 2a of the motor, etc., and the motor 8 has the power circuit 7. It is connected to the power supply 12 via.

The human body sensor 13 is provided above the car at the entrance of the elevator in order to prevent the passenger from hitting the door that is about to be closed and injuring the passenger, and detects the passenger without contact. Sensor output 3 of the human body sensor 13 shown in FIG.
a is taken into the A / D converter 14, and the CPU 4 is shown in FIG.
Whether or not the human body can be detected is determined based on a predetermined detection level Va shown in (c). Then, the information is sent to the elevator control panel 1 through the input / output port 2, and as a result, the elevator control panel 1 can switch the opening / closing command from the door closed to the door open and perform the door reversing operation.

The features of the human body sensor 13 for detecting passengers will be described. The detection method uses sound from the sensor,
One that detects the change in sound, light, etc. that transmits light and is reflected and received when a passenger (person) approaches the sensor, and one that detects the amount of temperature change that occurs when the passenger approaches the sensor. Has been. The human body sensor 13 is generally installed near the entrance as described above.

What is taken into consideration when using the human body sensor 13 is that when the door is closed and reaches the vicinity of full closure as shown in FIG. 5B, the detection area of the sensor is blocked by the landing door. Since the sensor output becomes large and it is impossible to determine that the passenger is approaching, as shown in FIG. 5B, the zone for detecting the landing door (from the position Sa to the fully closed position) is a dead zone. , The sensor output is invalid.

Since the human body sensor 13 detects passengers based on changes in sound, light and temperature as described above, it may be affected by the surrounding environment of the elevator installation.
Predetermined detection level V shown in FIG.
a is provided to prevent malfunction. As a matter of course, the detection level differs depending on how the human body sensor 13 is attached, which is one of the causes of malfunction.

As shown in FIG. 5 (c), originally, when the sensor output reaches the predetermined detection level Va, the door reversing operation is performed, so that the door closing operation is not continued, but in FIG. Not shown in it.

[0012]

In the conventional elevator door safety device as described above, the human body sensor 13 is affected by the installation situation and the surrounding environment as described above, and the influence of the human floor sensor 13 also affects the landing level of each floor. The detection level differs according to the situation, and various malfunction margins are provided.
However, in order to detect passengers, it is better to have a little sensitivity, but if there are many malfunctions, the frequency of elevator startup will decrease, making it impossible to close the door depending on the contents of the malfunction, making the elevator unusable. Therefore, the human body sensor 13 is inevitably invalidated at the site where many malfunctions occur.

The problem here is a malfunction due to a landing door near the fully closed position while the door is closed, and a margin for the detection level due to the surrounding environment. Then, it aims at solving the said problem by changing a malfunction margin according to installation and surrounding environment.

[0014]

A safety device for an elevator door according to claim 1 of the present invention is installed at an upper part of an entrance / exit of an elevator car, and detects a passenger in the vicinity of a landing of the elevator in a non-contact manner. Of an elevator door including a door control circuit that generates a torque command so that the command follows the actual motor rotation speed and drives the elevator door to open and close by the motor, and stops the door closing operation based on the output of the detection means. In the safety device, the door control circuit stores the position where the hall door is detected based on the output of the detecting means during the door opening operation, and invalidates the output of the detecting means at the next door closing operation. The detection area is changed.

A safety device for an elevator door according to a second aspect of the present invention is installed at an upper portion of an entrance / exit of an elevator car, and detects a passenger in the vicinity of a landing of the elevator in a non-contact manner, and a speed command indicates an actual motor rotation. A safety device for an elevator door, comprising: a door control circuit that generates a torque command to follow a speed to open and close the elevator door by a motor, and stops a door closing operation based on an output of the detection means. The control circuit stores the maximum value of the detection level based on the output of the detecting means during the door opening operation, and changes the detection level for judging the passenger from the output of the detecting means during the next door closing operation.

[0016]

The purpose of the safety device for the elevator door is to prevent the passenger from colliding with the door or being caught by the passenger when the door is closed, and conventionally the sensor output when the door is open is invalid. However, the same can be said for the sensor output due to the surrounding environment including the landing doors that obstruct the sensor detection area, even when the door is open, only the direction of movement of the door is different. Therefore, from the sensor output when the door is open, it is possible to confirm the fluctuation of the sensor output due to the zone or the surrounding environment in the vicinity of fully closed, which interferes with the sensor detection by the hall door.

That is, the malfunction zone due to the door near the fully closed state and the current sensor output level are grasped by the sensor output when the door is opened, and the information is utilized at the next door closing to change the sensor invalid zone and the detection level. By letting
It is possible to set an appropriate detection sensitivity that does not cause a malfunction. As a result, the elevator door safety device does not malfunction and does not lose its original function.

[0018]

【Example】

Example 1. The configuration of the first embodiment of the present invention will be described with reference to FIG. First Embodiment FIG. 1 is a block diagram showing a first embodiment of the present invention, which is an elevator control panel 1-ROM 3,
The PWM unit 5 to the pulse counting unit 10 and the power supply 12 to the A / D converter 14 are the same as those of the above-described conventional device. In each drawing, the same reference numerals are the same or corresponding parts. In FIG. 1, a door control circuit surrounded by an alternate long and short dash line is a CPU 4A having the functions described below, and an RA for storing zones for detecting landing doors, detection levels, and the like.
Equipped with M11A.

The operation of the first embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a timing chart showing the door opening operation of the first embodiment of the present invention. Further, FIG. 3 is a timing chart showing the door closing operation according to the first embodiment of the present invention.

The first embodiment according to the present invention will be described with reference to FIG. 2 together with the normal door opening operation. When a door opening command is issued from the elevator control panel 1, the input / output port 2
The speed pattern 1b corresponding to the door position point shown in FIG. 2A is read from the ROM 3 into the CPU 4A.

Further, the pulse from the pulse encoder 9 provided in the motor 8 is converted into the pulse count unit 1
0 is input to the CPU 4A, the CPU 4A calculates the rotation speed, and based on the result, the CPU 4A outputs a torque command to the PWM unit 5. Next, a gate signal is generated from the gate signal generation circuit 6, the power circuit 7 starts to drive, the motor 8 rotates at the speed (rotation speed 2b) shown in FIG. 2A, and the elevator door (not shown) The door begins to open.

On the other hand, when the sensor output is fully closed, the sensor detection area is blocked by the hall door, and at this time, the hall door is detected immediately before the sensor.
As shown in the vicinity of the fully closed state in (b), the sensor output is strongly detected and a large output is output.

When the door opening operation is continued, the hall door does not block the human body sensor 13, and the sensor output gradually decreases with the door opening operation. Here, for example, when the human body sensor 13 is attached to the hall side more than usual, the hall doors are detected more in the vicinity of the fully closed state, and normally all sensor outputs are detected as shown in FIG. 5C. Although it is small near the closed position, if it is not mounted properly, the sensor output becomes large near the fully closed position as shown in FIG. 2 (b). Therefore, in the sensor ineffective zone (zone from the fully closed position to the position Sa) due to the normal landing door, the output is larger than the normal detection level Va shown in FIG. 2 (b). A landing door will cause a malfunction.

Therefore, since it is determined that the hall door has been detected from the start of the door opening operation to the level below the normal detection level Va, the next door closing operation will be performed as shown in FIG. 3 (b). , The sensor invalid zone by the hall door is changed from Sa to Sb. As a result, the next time the door is closed, the malfunction due to the detection of the hall door is eliminated.

Example 2. A second embodiment of the present invention will be described with reference to FIGS. 2 and 3 as in the first embodiment. Since the door opening operation is the same as the above, it is omitted.

While fully closed, the human body sensor 13 detects the hall door and outputs it as described above. When the door opening operation is started, as the hall door is opened, the hall door is no longer detected, and instead, something near the hall is started to be detected. For example, a guide plate or a foliage plant may be placed, and when the landing is outdoors, the temperature suddenly changes or the wind blows. as a result,
The sensor output is in an unstable state as shown in FIG. 2 (b), and it is not possible to distinguish the passenger from the passenger at the normal detection level Va. Therefore, if it is left as it is, a malfunction may occur due to the surrounding environment during the door closing operation. become.

Therefore, the level at which the sensor output becomes maximum is read from the detection zone of the landing door (zone from the fully closed position to the position Sb) from the start of the door opening operation, and the passenger detection level at the next door closing operation. Is changed from the normal detection level Va to Vb which secures a margin more than the sensor output. As a result, the next time the door is closed,
As shown in (b), the malfunction due to the surrounding environment is eliminated.

In the second embodiment, the method of simply reading the maximum value of the sensor output when the door is open has been described.
If the sensor output for each position of each door is stored and the detection level is not fixed at the next door closing, and the detection level is changed flexibly for each position point, there is no malfunction and a highly sensitive elevator. A door safety device can be realized.

As described above, the human body sensor 13 which detects passengers near the entrance without contact while the door of the elevator is closed is different in the detection level due to the influence of the installation situation and the surrounding environment. It has a malfunction margin. However, in detecting passengers, it is better that the sensitivity is as sharp as possible, but on the other hand, if there are many malfunctions, the frequency of elevator startup will decrease, and this will be a nuisance to users. The problem here is a malfunction due to a landing door near the fully closed position while the door is closed, and a margin for the detection level due to the surrounding environment.

As described above, the first and second embodiments of the present invention aim to solve the above problems by changing the malfunction margin according to the installation of the human body sensor 13 and the like and the surrounding environment. The same can be said for the sensor output due to the surrounding environment, including the landing doors that obstruct the sensor detection area, only the door operation direction is different even when the door is open. Therefore, it is utilized that the sensor output at the time of opening the door can be used to confirm the fluctuation of the sensor output due to the zone or the surrounding environment in the vicinity of the fully closed state which hinders the detection by the hall door.
Check the sensor output when opening the door and match it to the situation,
By setting the detection level and sensor invalid zone at the next door closing, it is possible to realize an elevator door safety device that has appropriate detection sensitivity that is not affected by the installation situation of the elevator and the surrounding environment. it can.

[0031]

As described above, the elevator door safety device according to claim 1 of the present invention is installed at the upper part of the entrance / exit of the elevator car, and is a non-contact detecting means for detecting passengers near the elevator hall. An elevator door including a door control circuit that generates a torque command so that the speed command follows the actual motor rotation speed, opens and closes the elevator door by a motor, and stops the door closing operation based on the output of the detection means. In the safety device, the door control circuit stores the position where the hall door is detected based on the output of the detecting means during the door opening operation, and invalidates the output of the detecting means at the next door closing operation. Since the door detection area is changed, the sensor output at the time of door opening operation is confirmed, and the sensor invalid zone at the time of the next door closing is set according to the situation, so Have adequate detection sensitivity that is not affected by installation conditions or ambient environment of the motor, it is possible to realize a malfunction without device, an effect that it is possible to improve the operation efficiency of the elevator.

As described above, the elevator door safety device according to claim 2 of the present invention is installed at the upper part of the entrance of the elevator car, and detects the passengers in the vicinity of the elevator landing without contact, and the speed command. A door control circuit that generates a torque command to follow the actual motor rotation speed to open and close the elevator door by the motor, and stops the door closing operation based on the output of the detection means. In the device, the door control circuit stores the maximum value of the detection level based on the output of the detection means at the time of door opening operation, and changes the detection level to judge the passenger from the output of the detection means at the next door closing operation. Therefore, by checking the sensor output during door opening operation and setting the detection level for the next door closing according to the situation, the elevator installation Have adequate detection sensitivity that is not affected by conditions or ambient environment, it is possible to realize a malfunction without device, an effect that it is possible to improve the operation efficiency of the elevator.

[Brief description of drawings]

FIG. 1 is a diagram showing Embodiments 1 and 2 of the present invention.

FIG. 2 is a timing chart showing a door opening operation according to the first and second embodiments of the present invention.

FIG. 3 is a timing chart showing a door closing operation according to the first and second embodiments of the present invention.

FIG. 4 is a view showing a conventional safety device for an elevator door.

FIG. 5 is a timing chart showing a door closing operation of a conventional elevator door safety device.

[Explanation of symbols]

 1 Elevator Control Panel 3 ROM 4A CPU 5 PWM Unit 6 Gate Signal Generation Circuit 7 Power Circuit 8 Motor 9 Pulse Encoder 10 Pulse Count Unit 11A RAM 13 Human Body Sensor 14 A / D Converter

Claims (2)

[Claims] 1. An elevator which is installed above an entrance / exit of an elevator car and detects a passenger in the vicinity of a landing of the elevator without contact, and a torque command to generate a torque command so that the speed command follows an actual motor rotation speed. In an elevator door safety device including a door control circuit that drives a door to open and close by a motor and stops a door closing operation based on the output of the detecting means, the door control circuit outputs the output of the detecting means during the door opening operation. A safety device for an elevator door, which stores a position where the hall door is detected on the basis of the hall door, and changes a hall door detection area where the output of the detecting means is invalidated at the next door closing operation. 2. An elevator which is installed above an entrance of an elevator car and which detects a passenger in the vicinity of a landing of the elevator in a non-contact manner, and a torque command to generate a torque command so that the speed command follows an actual motor rotation speed. In an elevator door safety device including a door control circuit that drives a door to open and close by a motor and stops a door closing operation based on the output of the detecting means, the door control circuit outputs the output of the detecting means during the door opening operation. A safety device for an elevator door, characterized in that the maximum value of the detection level is stored on the basis of the detection level, and the detection level for judging that the passenger is a passenger is changed from the output of the detection means at the next door closing operation.