JP2004182077A - Safety system of platform door device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely detect a passenger with a small number of sensors. <P>SOLUTION: Range finder sensors 14a, 14b to set each optical axis to project each light toward a train 8 are arranged on each panel surface of respective slide doors 12a, 12b on the train side 8 of a platform door device. Respective optical axes of the range finder sensors 14a, 14b scan between the train 8 and the platform door device by accompanying a sliding of the respective slide doors 12a, 12b. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention detects whether a passenger is present between the platform door device and the train when the door panel of the platform door device installed on the platform of the railway station is closing, and detects the presence of the passenger. The present invention relates to a safety system for a platform door device for ensuring safety.
[0002]
[Prior art]
In the platform door device, an opening is provided in a fixed wall installed on the platform. A slide door is provided to open and close this opening. When the train is not on the platform, the opening is closed by a sliding door. When the train enters the platform and stops and the train door is opened, the sliding door slides and the opening is opened. Passengers get on and off the train through this opening. After the end of boarding, the train door is closed and the sliding door slides to close the opening. Such operations ensure passenger safety.
[0003]
By the way, an architectural limit position is set on the platform. No device can be installed on the train side from this architectural limit. Therefore, a space is inevitably generated between the platform door device and the train. When the train door closes and the sliding door closes the opening, if passengers remain in the space between the platform door device and the train, this passenger will also move inside the platform door device on the train side You can't do that. If the train departs in this state, there is a risk of a personal injury. In order to prevent such a situation from occurring, when the slide door starts moving, it is detected whether or not a passenger exists between the slide door and the train, and if so, the opening is opened again. A safety system has been considered in which the sliding door is moved to the next position or the sliding door is stopped at that position. Therefore, a photoelectric sensor is provided to detect a passenger in the space.
[0004]
[Problems to be solved by the invention]
However, in order to reliably detect the above space, many photoelectric sensors must be installed, which increases the cost of the platform door device.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a safety system for a platform door device capable of reliably detecting a passenger existing between a train and the platform door device with a small number of photoelectric sensors.
[0006]
[Means for Solving the Problems]
In the safety system for a platform door device according to the present invention, a photoelectric sensor is installed on a panel surface on a track side of a slide door of the platform door device. The platform door device has, for example, an opening, and a slide door is provided so as to open and close the opening. The optical axis of the photoelectric sensor is set so as to project light toward the light reflecting object on the track side. Light reflecting objects include the edges of trains and platforms, as described below. The optical axis of the photoelectric sensor scans between the light reflecting object and the platform door device as the sliding door slides.
[0007]
In the safety system configured as described above, when the sliding door that has been opened starts sliding so as to close, scanning is performed between the light reflecting object and the platform door device. If the door panel is not provided with a photoelectric sensor, for example, if a photoelectric sensor is provided at a fixed position, a large number of photoelectric sensors will be necessary if the photoelectric sensor attempts to detect all parts between the light reflecting object and the platform door device. Become. However, if a photoelectric sensor is provided on the sliding door, it is possible to detect everything between the light reflecting object and the platform door device with the movement of the sliding door. Can be reduced. In addition, as described above, the platform has an architectural limit, and it is not possible in principle to install any device on the track side beyond this. Because it is located, the problem of building limits can be cleared.
[0008]
The optical axis of the photoelectric sensor can be set with respect to the body of the train that stops on the track side. With this configuration, the passenger detection area can be formed substantially in a horizontal plane, and the passenger in the detection area can be reliably detected.
[0009]
Alternatively, the optical axis of the photoelectric sensor can be set with respect to the edge of the platform on the track side. With this configuration, a three-dimensional detection area from the slide door of the platform door device to the edge of the platform can be formed, and the passenger in the detection area can be reliably detected.
[0010]
The photoelectric sensor may be a distance measuring sensor. This distance measuring sensor emits light toward a reflecting object, receives the reflected light, and measures the distance between the reflecting object and the distance measuring sensor. As a result, compared to a reflection type photoelectric sensor that detects the presence or absence of an object, the influence of disturbance is small, and a passenger can be accurately detected.
[0011]
Further, the distance measuring sensor may store in advance a reference distance to the light reflecting object on the track side. The distance measuring sensor detects a passenger based on the reference distance, for example, depending on whether the distance to the detected object is longer or shorter than the reference distance. With this configuration, the setting and adjustment of the plurality of distance measurement sensors provided in the platform door device can be performed simultaneously, so that the time required for these settings and adjustment can be reduced in a short time.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
The platform door device according to one embodiment of the present invention is installed on a platform 2 of a station, as shown in FIG. A fixed wall 6 is disposed along the length direction of the platform 2 at a position recessed on the opposite side to the track by a predetermined distance from the edge 2a on the track side of the platform 2. A plurality of door openings 4 are formed in the fixed wall 6 at predetermined intervals along the length direction of the platform 2. These door openings 4 are provided corresponding to the positions where the doors 10 of the respective vehicles of the train 8 are present when the train 8 stops on the platform 2. A pair of slide doors 12a and 12b are provided for each door opening 4 so as to open and close the door openings 4. These sliding doors 12a and 12b slide from the fixed wall 6 toward the respective door openings 4.
[0013]
FIG. 1 is an enlarged view showing one door opening 4 and a pair of sliding doors 12a and 12b for opening and closing the door opening. As shown in FIG. 1, a photoelectric sensor, for example, a distance measuring sensor 14a, 14b is provided on the track side of these slide doors 12a, 12b, that is, on the surface of each train side of the train 8. As shown in FIG. 3, a plurality of, for example, two distance measuring sensors 14a are arranged at intervals along the height direction of the slide door 12a at the door end of the slide door 12a. Similarly, a plurality of, for example, two distance measuring sensors 14b are arranged at intervals along the height direction of the slide door 12b at the door end of the slide door 12b.
[0014]
As shown in FIG. 7, each of the distance measuring sensors 14a and 14b has a light projecting element, for example, an infrared light projector 16 and a light receiving element, for example, a PSD (Photo Sensitive Device) 18. In the distance measuring sensors 14a and 14b, the position at which the light beam emitted from the light projector 16 and reflected by the light reflecting object enters the PSD 18 varies depending on the distance from the light projector 16 to the light reflecting object. Using this principle, the distance from the projector 16 to the reflecting object is measured. As shown in FIG. 2, the light projecting optical axis is directed such that the light beams emitted from the light projecting device 16 are directed substantially perpendicular to the vehicle body of the stopped train 8. Of course, the optical axis of the reflected light reflected by the vehicle body and traveling toward the PSD 18 is also perpendicular to the vehicle body.
[0015]
As described above, the distance measurement sensors 14a and 14b are attached to the doors of the slide doors 12a and 12b toward the train 8. Accordingly, the sliding doors 12a and 12b slide from the state where the train 8 stops and the door opening 4 is opened as shown in FIG. 1 to the state where the door opening 4 is completely closed as shown in FIG. Then, each distance measuring sensor 14a, 14b also slides along with the sliding of the sliding doors 12a, 12b, and has a width substantially equal to the width of the door opening 4 and a distance from the train 8 side of the sliding doors 12a, 12b to the train 8. Each of the distance measurement sensors 14a and 14b scans a detection area 19 (see FIG. 5) located in a horizontal plane having a depth equal to the distance.
[0016]
As shown in FIG. 4, when the passenger 20 is located in the detection area 19, the passenger 20 can be detected while the scanning is being performed. When this detection is performed, the sliding doors 12a and 12b slide again to open the door opening 4, or stop at the position where the passenger is detected. As shown in FIG. 2, the detection area 19 detects a position beyond the construction limit position (a position where any device should not be attached to the train 8 side than this position) to the train 8 side. Is set to be able to. Moreover, in an existing system in which the entire detection area 19 is covered by a plurality of distance measurement sensors 14a and 14b installed at fixed positions, a considerable number of distance measurement sensors are required. However, in this system, together with the slide doors 12a and 12b, Since the distance measuring sensors 14a and 14b are moved, the number of distance measuring sensors to be used is very small.
[0017]
In order to detect passengers, for example, from when the train 8 stops and there is no object such as a person in the detection area and the door opening 4 is open, the sliding doors 12a and 12b close the door opening 4. In the meantime, the distance measured by the distance measuring sensors 14a and 14b, that is, the distance from the distance measuring sensors 14a and 14b to the train 8 is stored in advance as a reference value. This reference value is almost constant even if the sliding doors 12a and 12b slide. If the distance measurement values of the distance measurement sensors 14a and 14b are smaller than the reference value, it can be determined that an object such as a passenger has been detected.
[0018]
In order to set such a reference value and determine the presence or absence of a passenger, each distance measuring sensor 14a, 14b is controlled by a control unit, for example, a CPU 20, as shown in FIG. The CPU 20 is connected to a ROM 22 storing programs executed by the CPU 20, an EEPROM 24 storing various parameters such as a reference distance, and a RAM 26 used as a work area when executing a program. The CPU 20 and the like are provided for each distance measuring sensor and are disposed in the fixed wall 6. Of course, it is also possible to install only one CPU 20 for a plurality of distance measurement sensors.
[0019]
FIG. 8 is a flowchart showing the processing performed by the CPU 20. First, it is determined whether learning has started (step S2). This is performed, for example, by determining whether or not a learning start instruction is given to the CPU 20 from a learning switch or the like (not shown). If it is determined that learning has started, the distance to the body of the train 8 is measured as described above (step S4). This distance is stored in the EEPROM 24 as a reference value (step S6), and the learning ends. This learning is performed simultaneously for all the distance measurement sensors 14a and 14b. Therefore, a reference value for each distance measuring sensor 14a, 14b is determined by the instruction to start learning, and one reference value is used regardless of the position of the doors 12a, 12b. This learning is performed when the distance measuring sensors 14a and 14b are installed for the first time. However, even after the installation, the learning can be appropriately performed by operating a learning switch as needed.
[0020]
Next, distance information from the distance measurement sensors 14a and 14b is obtained (step S8), and a process of removing noise from this information is performed to obtain a measured value (step S10). It is determined whether this measured value is smaller than a value obtained by subtracting a predetermined dead zone width from the reference value (step S12). If the result of this determination is no, it can be determined that an object such as a passenger has not been detected. Accordingly, the outputs of the distance measuring sensors 14a and 14b are turned off so as to perform the closing operation of the slide doors 12a and 12b (step S14), and the process returns to step S8. If the result of the determination in step S12 is YES, it can be determined that an object such as a passenger has been detected. Accordingly, in order to open or stop the sliding doors 12a, 12b, the outputs of the distance measuring sensors 14a, 14b are turned on (step S16), and the process returns to step S8.
[0021]
In Step S12, the predetermined dead zone width is subtracted from the reference value when the measured value is compared with the reference distance, when the measured value is slightly smaller than the reference distance, for example, when the body of the train 8 shakes or the like. It is also determined that a passenger or the like has been detected, which may cause a malfunction.
[0022]
In the above embodiment, since the train 8 is used as the light reflecting object, the optical axes of the distance measuring sensors 14a and 14b are directed to the train 8 side. However, as shown in FIG. 9, when the edge 2a of the platform 2 is used as the light reflecting object, the distance measuring sensors 14a and 14b are adjusted so that their optical axes face the edge 2a of the platform 2. The distance measuring sensors 14a and 14b may be arranged obliquely downward on the track side. Even in the case of such a configuration, the detection area is formed obliquely between the edge 2a and the distance measurement sensors 14a and 14b, and the area of the detection area can be increased.
[0023]
In the above-described embodiment, the distance measuring sensors 14a and 14b are used as the photoelectric sensors, but a reflection-type photoelectric sensor may be used instead. In the above-described embodiment, the double-sided slide doors 12a and 12b are used, but a single-sided slide door can also be used.
[0024]
【The invention's effect】
As described above, in the safety device of the platform door device according to the present invention, since the sliding door is provided with the photoelectric sensor, the connection between the platform door device and the light reflecting object is ensured without using many photoelectric sensors. The interval can be detected.
[Brief description of the drawings]
FIG. 1 is a plan view showing a state in which a slide door of a platform door device implementing a safety system according to an embodiment of the present invention is open.
FIG. 2 is a side view of the platform door device of FIG. 1;
FIG. 3 is a front view of the platform door device of FIG. 1;
FIG. 4 is a plan view of the platform door device of FIG. 1 when a sliding door is being closed;
FIG. 5 is a plan view of the platform door device of FIG. 1 in a state where a slide door is closed.
FIG. 6 is a plan view showing a state where a plurality of platform door devices of FIG. 1 are provided.
FIG. 7 is a block diagram of a safety system of the platform door device of FIG. 1;
FIG. 8 is a flowchart of the safety system of FIG. 7;
FIG. 9 is a side view of a platform door device implementing a safety system according to another embodiment of the present invention.
[Explanation of symbols]
12a 12b Sliding door 14a 14b Distance measuring sensor

Claims (5)

A safety system for detecting a passenger existing between a platform door device and a train,
On a panel surface on the track side of the slide door of the platform door device, a photoelectric sensor having an optical axis set so as to project light toward a light reflecting object on the track side is installed,
A safety system for a platform door device, wherein an optical axis of the photoelectric sensor scans between the light reflecting object and the platform door device as the sliding door slides. The safety system for a platform door device according to claim 1, wherein an optical axis of the photoelectric sensor is set to a body of a train that stops on the track side. The safety system for a platform door device according to claim 1, wherein the optical axis of the photoelectric sensor is set with respect to an edge of the platform on the track side. 4. The safety system for a platform door device according to claim 1, wherein said photoelectric sensor is a distance measuring sensor. 5. The safety system according to claim 4, wherein the distance measuring sensor stores a reference distance to the light reflecting object on the track side in advance and detects a passenger based on the reference distance. system.

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