JP7672833B2 - Distance measuring device for platform doors - Google Patents

Description

The present invention relates to a distance measuring device for platform doors that measures the distance between platform doors installed on platforms at railway stations and the track.

A construction gauge has traditionally been set for structures or buildings installed on platforms. This construction gauge is the range in relation to the tracks within which buildings and other structures may not be installed. In recent years, it has become common to install platform screen doors as structures on platforms. These platform screen doors, too, must not be installed inside the construction gauge (i.e., closer to the tracks than the construction gauge).

An obstacle sensor may be installed on the track side of the platform door to detect the presence of a foreign object, for example. In this case, an obstacle sensor box that surrounds this obstacle sensor is present on the track side of the platform door. If there is a protrusion such as an obstacle sensor box on the track side of the platform door, it is necessary to check the distance from the track side end face of the protrusion, such as an obstacle sensor, to the track so that the track side end face of the platform door does not fall inside the building gauge. In general, it is necessary to check the distance from the center of the track to the protrusion.

Conventionally, as shown in Fig. 9, the distance between an end face 103a of an obstacle sensor box 103 of a platform door 102 installed on a platform 101 and a center line 104c of tracks 104a, 104b has been obtained by triangulation using a triangulation device 105. Although triangulation allows for highly accurate measurements, it has the following drawbacks.
(1) It is necessary to install and adjust measuring equipment at each measurement point, which is time-consuming.
(2) Multiple workers are required.
(3) Professional engineers with surveying skills are required.

Furthermore, in the past, Patent Documents 1 and 2 disclose distance measurement devices for platform doors that use a laser displacement sensor, a laser scanner sensor, a laser oscillator, and a camera. However, laser displacement sensors and laser scanner sensors are expensive. And measurement devices that use a laser oscillator and a camera are very large. For these reasons, conventional distance measurement devices for platform doors that use a laser scanner sensor, etc. are large and expensive.

JP 2008-107291 A JP 2012-017989 A

The present invention was made in consideration of the above-mentioned problems with conventional devices, and its first objective is to provide a measuring device that can easily check that platform screen doors are not installed inside the construction gauge. Its second objective is to make it possible to manufacture the measuring device inexpensively.

The distance measuring device for platform doors according to the present invention is a distance measuring device for platform doors that measures the distance to a track for a platform door installed on a platform at a railway station, and comprises a carriage that is movable on the track, a support pillar attached to the carriage, and a distance confirmation member attached to an upper part of the support pillar, the distance confirmation member having a first branch portion extending upward from the support pillar, and a second branch portion that is provided parallel to the first branch portion and has a predetermined width therebetween, the outer surface of the second branch portion being a confirmation surface, the platform door is installed on the platform side of the building limit line, and the support pillar has a front When the bogie is placed on the track, it is positioned on the track side of the building limit line and extends in the vertical direction facing the track side tip of the platform, the confirmation surface is positioned opposite the end face of the track side extension of the platform door, the confirmation surface extends in the vertical direction along the end face of the track side extension of the platform door, the point of the confirmation surface closest to the platform door is on the building limit line, the distance confirmation member is detachable from the upper part of the support, and an attachment surface for fixing the first branch portion of the distance confirmation member is provided on the upper part of the support.

In general, tracks may be inclined due to environmental conditions such as cant. In such cases, the end face of the distance confirmation component may be inclined relative to the platform doors. When the end face of the distance confirmation component is inclined in this way, it is sufficient that the point of that end face closest to the platform doors is on the construction limit line.

This distance measuring device for platform doors makes it possible to easily and quickly check the position of the platform door relative to the construction limit line by visually comparing the end face of the distance checking component on the platform side (i.e., the checking surface) with the end face of the platform door.

In a second aspect of the present invention, the platform door distance measuring device has a sensor that detects an obstacle between the platform door and the track, and an obstacle sensor box that has the sensor built in, and the end face of the track-side protrusion of the platform door is the track-side end face of the obstacle sensor box.

This aspect of the invention specifies an example of which part of the platform screen door is the measurement point of the measurement object. In other words, in this aspect of the invention, the obstacle sensor box, which is one of the components of the platform screen door, is the part that protrudes most toward the track, and therefore this obstacle sensor box is the measurement object.

In the distance measuring device for platform doors of the present invention, the distance confirmation member is attachable and detachable to the upper part of the support pillar.
For structures installed on railway platforms, a construction gauge is set for the track. This construction gauge determines the distance range in relation to the track within which structures must not be installed. The construction gauge has a value set for each railway company. If the distance confirmation member is made detachable from the bogie, it is possible to meet the requirements of each railway company with a single bogie.

Another aspect of the distance measuring device for platform doors according to the present invention is a laser measuring device attached to the distance confirmation member so as to face the platform door, the laser measuring device having a light emitting element that emits laser light toward a measuring point on the end face of the platform door on the track side, a light receiving element that receives the laser light reflected at the measuring point and outputs a signal, and a measuring device door distance calculation means that calculates the distance between the laser measuring device and the measuring point (= measuring device door distance D2) based on the output signal from the light receiving element, and further, this distance measuring device for platform doors is characterized by having a track door distance calculation means that calculates the distance of the platform door to the track (= track door distance D3) based on the output signal from the measuring device door distance calculation means.

In general measurements of platform doors, it is often necessary to determine the distance of the platform door from the track centerline. The laser measuring device used in this invention is an inexpensive device that is primarily intended to measure short distances, so it is not suitable for directly measuring platform doors that are located a long distance from the track centerline. However, if the output signal of the laser measuring device is recalculated by a track door distance calculation means, the above requirement can be met.

Another aspect of the distance measuring device for platform doors according to the present invention is characterized in that the mounting position of the distance confirmation member or the laser emission position of the laser measuring device is adjusted based on the distance data calculated by the track door distance calculation means (track door distance D3) and the distance data actually measured using triangulation. According to this aspect of the invention, accurate distance data can be obtained by the distance measuring device for platform doors.

Another aspect of the distance measuring device for platform doors according to the present invention includes a bogie movement distance measuring means for measuring the distance traveled by the bogie on the track, and a track door distance calculating means for determining the relationship between the bogie movement distance and the distance of the platform door from the track based on the distance data calculated by the track door distance calculating means and the distance data measured by the bogie movement distance measuring means.

In the above configuration, the bogie travel distance measuring means can be realized, for example, by combining the encoder 16 in FIG. 1 with the bogie travel distance calculation unit 31 in FIG. 6. According to this aspect of the present invention, distance information of the platform door along the track can be obtained.

In yet another aspect of the distance measuring device for platform doors according to the present invention, a plurality of (e.g., three) laser measuring devices are provided vertically above and below the distance confirmation member, and the reference points (P1) for the laser emission and laser reception of these laser measuring devices are in the same position in the horizontal direction and in different positions in the vertical direction. According to this aspect of the invention, detailed distance data from the center of the track to the platform doors can be obtained.

Another aspect of the distance measuring device for platform doors according to the present invention has a carriage fixing means for fixing the carriage in a fixed position on the track. The specific structure of the carriage fixing means can be determined as desired. According to this aspect of the invention, the distance confirmation member can be made stationary in front of the platform doors, so that distance confirmation work using the distance confirmation member and distance measurement work using a laser measuring device can be performed accurately.

According to the distance measuring device for platform doors according to the present invention as set forth in claim 1, the position of the platform door relative to the construction limit line can be easily and quickly confirmed by visually comparing the end face of the distance confirmation member on the platform side (i.e., the confirmation surface) with the end face of the platform door on the track side.

1 is a side view showing one embodiment of a distance measuring device for platform doors according to the present invention. FIG. FIG. 2 is a plan view of the distance measuring device for platform doors shown in FIG. 1. This is an oblique view showing an example of a platform door. FIG. 2 is a block diagram showing an internal configuration of an example of a laser measuring instrument which is a main device in FIG. 1 . FIG. 2 is an enlarged view of the area near the platform door in FIG. 1. 2 is a block diagram showing an internal configuration of an example of a control device which is a main device in FIG. 1 . This is a diagram showing the dimensions of each part of the distance measuring device for platform doors in Figure 1 when it is in a non-canted state. This is a diagram showing the dimensions of each part when the distance measuring device for platform doors in Figure 1 is in a canted state. FIG. 1 is a diagram showing triangulation conventionally used in distance measurement;

The distance measuring device for platform doors according to the present invention will be described below based on an embodiment. It is needless to say that the present invention is not limited to this embodiment. Also, in the drawings attached to this specification, components may be shown at different ratios than in actuality in order to clearly show characteristic parts.

Figure 1 shows a side view of one embodiment of a distance measuring device for platform doors according to the present invention. Figure 2 shows a plan view of the distance measuring device for platform doors in Figure 1. Figure 1 is a cross-sectional view taken along line C-C in Figure 2. In these figures, tracks 4a and 4b are laid in the direction penetrating the plane of Figure 1 (i.e., the vertical direction of the plane of Figure 2). Platform 1 is installed parallel to tracks 4a and 4b. Platform doors 2 are installed above platform 1.

(Platform doors)
As shown in Figure 3, the platform door 2 has an enclosure 10, a door 11, and an obstacle sensor box 3 as a structure that protrudes toward the track. The door 11 can open and move in the direction of arrow A in Figure 3, and can close and move in the direction of arrow B. The door 11 that opens and moves in the direction of arrow A is stored inside the enclosure 10. The space formed by the door 11 opening and moving becomes a passageway for people.

In this embodiment, two types of obstacle sensor boxes 3, one with a long vertical length 3a and one with a short vertical length 3b, are attached to the track side surfaces of different enclosures 10 as needed.

A light-emitting element (not shown) is provided inside one of the obstacle sensor boxes 3. A light-receiving element (not shown) is provided inside the other obstacle sensor box 3. The light-emitting element and the light-receiving element form a sensor. When a foreign object is present near the door 11, the presence of the foreign object can be detected by this sensor.
The detection system provided inside the obstacle sensor box may be a three-dimensional sensor or the like arranged inside one of the obstacle sensor boxes. In this case, the other obstacle sensor box may be arranged as a dummy. Various shapes of obstacle sensor boxes may be adopted.

In general, the track-side end face of the structure (obstacle sensor box 3 in this embodiment) that protrudes onto the track side of the platform door 2 must not extend beyond the construction limit line G in Figure 1. The construction limit is the range within which buildings and other structures must not be installed on the track. The construction limit line G is the boundary line of the construction limit. As the platform door 2 is in principle placed in a vertical direction relative to the horizontal direction, the construction limit line G appears as a line parallel to the track-side end face of the platform door 2. The construction limit is determined by each railway company.

(Cart)
In Figure 1, a distance measuring device for platform doors, generally designated by reference numeral 5, has a bogie 6. The bogie 6 is placed on tracks 4a and 4b. The bogie 6 has a frame 7 extending horizontally, and a support member 8 attached to the frame 7. The support member 8 is a long, rod-shaped member with a rectangular cross section. The rear end of the support member 8 is fixed to the frame 7, and its tip is bent to form a support 9. The support 9 extends at a right angle to the frame 7 in Figure 1 (upward in Figure 1). Reference numeral 12 denotes a reinforcing member.

In FIG. 2, wheels 15 are provided at the four corners of the frame 7. In FIG. 1, each wheel 15 rests on the tracks 4a, 4b. When a person pushes the cart 6 along the tracks 4a, 4b, the wheels 15 roll on the tracks 4a, 4b, and the cart 6 moves parallel to the platform 1 in the direction of the arrows E-E' in FIG. 2. At least one of the wheels 15 is provided with an encoder 16. The encoder 16 outputs a pulse signal in response to the rotation of the wheels 15.

Above one of the tracks 4b, a carriage fixing device 17 is provided on the frame 7. The carriage fixing device 17 is a device for fixing the carriage 6 to the track 4b in a fixed position. The carriage fixing device 17 can be configured with any structure. For example, the carriage fixing device 17 can be configured by a combination of a gripping member (not shown) that can be opened and closed, a drive mechanism (not shown) that drives the gripping member to open and close, a drive source (not shown) such as a motor or air cylinder that operates the drive mechanism, and a switch (not shown) that supplies electricity to the drive source. By operating the switch from a short distance away using an appropriate member (for example, a rod-shaped member) to operate the drive source, the frame 7 and therefore the carriage 6 can be fixed in a fixed position on the tracks 4a and 4b by firmly gripping the track 4b with the gripping member. This fixing measure for the carriage 6 is intended to achieve stable measurement.

(Distance confirmation member)
In Fig. 1, a distance confirmation member 18 is detachably attached to a support 9 of a bogie 6 by a fixing element 13 such as a bolt. The distance confirmation member 18 is in the form of a bent rod-shaped member with a rectangular cross section as shown in the pull-out reference diagram (A) of Fig. 1. An inner edge surface 18a of the lower part of the branch part on the track side of the distance confirmation member 18 is the attachment surface to the support 9. An outer edge surface 18b of the branch part on the platform 1 side of the distance confirmation member 18 is the confirmation surface. The confirmation surface 18b is an edge surface for confirming whether the track side end surface of the obstacle sensor box 3 (i.e., the track side overhang part of the platform door 2) does not intrude inside (the track side) of the building limit line G.

In this embodiment, the distance D0 between the center line X0 of the tracks 4a and 4b and the confirmation surface 18b of the distance confirmation member 18 (= the distance between the track confirmation surfaces) is set so that the confirmation surface 18b is on the building limit line G when the cart 6 is placed on the tracks 4a and 4b. Note that "on the line" does not necessarily mean that it is not exactly on the line, but also includes the case where it is slightly off the line due to manufacturing errors or assembly errors of the parts. Such an error is, for example, within the range of ±20 mm, preferably within the range of ±10 mm, and more preferably within the range of ±5 mm.

With this configuration, with the bogie 6 placed on the tracks 4a, 4b, an operator can visually check the distance between the confirmation surface 18b of the distance confirmation member 18 and the track-side edge of the obstacle sensor box 3, and easily determine whether the track-side protruding end face of the platform door 2 is in a normal position relative to the building limit line G. Note that since the installation standards for platform doors differ for each railway company, the distance confirmation member 18, including the bogie 6, is created for each railway company to accommodate this.

To improve the accuracy of the above judgment, the attachment edge surface 18a of the distance confirmation member 18 to the support 9 and the confirmation surface 18b are machined to have precise parallelism with each other. In addition, the attachment edge surface 18a and the confirmation surface 18b are precisely surface-treated. As a result of this parallelism treatment and surface treatment, the confirmation surface 18b is perpendicular to the line segment F between the tracks 4a and 4b (i.e., the line connecting the vertices of the upper parts of the tracks).

In addition, to improve the accuracy of the above determination, each element of the distance between the track center line X0 and the mounting surface 9a of the support 9, the surface precision of the mounting surface 9a, the surface precision of the mounting edge surface 18a of the distance confirmation member 18, the width W between the branches of the distance confirmation member 18, and the surface precision of the confirmation surface 18b of the distance confirmation member 18 are finished with great precision.

(Laser measuring device)
1 and 2, a flat mounting plate 21a is attached to the upper part of the side surface of the distance confirmation member 18. Also, a flat mounting plate 21b is attached to the lower part of the side surface of the distance confirmation member 18. A first laser measurement device 22a is fixed to the mounting plate 21a, a second laser measurement device 22b is fixed to the upper part of the mounting plate 21b, and a third laser measurement device 22c is fixed to the lower part of the mounting plate 21b.

As shown in FIG. 4, each of the laser measuring instruments 22a, 22b, and 22c has a laser emitting element 23, a laser receiving element 24, a measuring instrument door distance calculation unit 25, and a power supply 26. The laser emitting element 23 emits a laser beam when it receives a predetermined trigger signal Tr. This laser beam is reflected at the measuring point P0. The reflected laser beam is received by the laser receiving element 24. At this time, a light receiving signal S1 is output. The measuring instrument door distance calculation unit 25 calculates the distance (= measuring instrument door distance) D2 between the measuring reference point P1 and the measuring point P0 of the measuring instruments 22a, 22b, and 22c based on the trigger signal Tr and the light receiving signal S1. The measuring reference point P1 is a reference point for laser emission and laser reception, and may be the laser emission point itself or the laser reception point itself. The measuring instrument door distance calculation unit 25 outputs the calculated distance data as a signal S2.

The laser measuring devices 22a, 22b, and 22c used in this embodiment realize the above functions, and although their functions are limited compared to the sensing devices used in conventional measuring devices (i.e., sensing devices using laser displacement sensors, laser scanner sensors, laser oscillators, and cameras), they are extremely inexpensive. The measuring device door distance calculation unit 25 may be configured using a computer, or may be configured using an electronic circuit without a computer.

An essential function of such an inexpensive laser measuring device is to calculate the short linear distance D2 in FIG. 4 and output the distance data as an electrical signal or display it as an image. The device shown in FIG. 4 only outputs a signal to the outside, but a device that displays an image to the outside is also conceivable. In such a device, a display device such as a liquid crystal display is provided in the laser measuring device 22a, 22b, 22c. A device that only displays the distance data as an image without outputting the distance data signal S2 to the outside is also conceivable. In such a device, an operator visually reads the displayed distance and inputs the read data into a computer using an input device such as a keyboard, and the distance from the track center to the platform door can be calculated using a calculation application (e.g., spreadsheet software) preinstalled in the computer.

The measurement reference points P1 of the three laser measuring devices 22a, 22b, and 22c are in the same position in the horizontal direction and different positions in the vertical direction in FIG. 5. The measurement point P0 of the first laser measuring device 22a corresponds to the upper top of the long obstacle sensor box 3a and the upper top of the short obstacle sensor box 3b. The measurement point P0 of the second laser measuring device 22b corresponds to the lower top of the short obstacle sensor box 3b. The measurement point P0 of the third laser measuring device 22c corresponds to the lower top of the long obstacle sensor box 3a. The number of laser measuring devices and the vertical installation positions of the multiple laser measuring devices are appropriately selected depending on which part of the platform door 2 the measurement point P0 is to be set at.

As is clear from the above, the laser measuring devices 22a, 22b, and 22c measure the linear distance from the measurement reference point P1 to the measurement point P0 of the platform door 2. Taking into account tolerances, etc., the measurement point P0 is located near the upper and lower tops of the obstacle sensor boxes 3a and 3b. In this embodiment, since there are two types of obstacle sensor boxes, the long obstacle sensor box 3a and the short obstacle sensor box 3b, the measurement point P0 is also set at the midpoint between the upper measurement point P0 and the lower measurement point P0. In this embodiment, the laser measuring devices 22a, 22b, and 22c are provided on the distance confirmation member 18, so the actual measured distances of these measuring devices are shorter.

In this embodiment, three laser distance meters, for example, GLM500 manufactured by BOSCH, are used as the laser measuring devices 22a, 22b, and 22c. The mounting positions of two of the three can be changed. The price of these laser distance meters is about 16,000 yen each, which is very inexpensive. In contrast, the sensing devices that have been used conventionally, namely, sensing devices using laser displacement sensors, laser scanner sensors, laser oscillators, and cameras, are multifunctional but very expensive, ranging from around 1 million yen to several million yen. In this way, according to this embodiment, the distance measuring device 5 for platform doors can be produced inexpensively.

In this embodiment, the actual measurement data from the laser measuring devices 22a, 22b, and 22c is not distance data relative to the orbit center X0. Therefore, when distance data from the orbit center X0 is required, the distance data from the orbit center X0 is calculated based on a predetermined formula.

(Control device)
1 and 2, a control device 29 is provided on the frame 7. In FIG. 6, the control device 29 has a track door distance calculation unit 30, a carriage movement distance calculation unit 31, and a track door distance calculation unit 32. Each of these calculation units is realized by an arithmetic processing unit of a computer. The control device 29 has a memory 33. The memory 33 stores data sent from the encoder 16 and the laser measuring devices 22a, 22b, and 22c as necessary, stores program software for performing measurements, and stores data during calculation as necessary.

The output signal of the encoder 16 in FIG. 1 and the output signals of the laser measuring instruments 22a, 22b, and 22c are taken into the control device 29 via the input/output interface 34a in FIG. 6. A display device 35 and a printer 36 are connected to the control device 29 via the input/output interface 34b. The display device 35 is, for example, a liquid crystal display device, and displays the results of the calculations of the various calculation means as images. The printer 36 prints the results of the calculations of the various calculation means as visible images as necessary. An input device 37 is connected to the control device 29 via the input/output interface 34c. The input device 37 is, for example, a keyboard. When it is desired to input any electronic data to the control device 29, the input is made using this input device 37.

The display device 35, printer 36, and input device 37 may be provided integrally with the control device 29 in FIG. 1, or may be provided at a location separate from the control device 29. When the display device 35 and the like are provided at a location separate from the control device 29, various data can be transmitted by wireless communication.

The track door distance calculation unit 30 receives the output data of the measuring instrument door distance calculation unit 25 in the laser measuring instruments 22a, 22b, and 22c in Figure 4 (i.e., electronic data indicating the measuring instrument door distance D2 in Figure 1), and calculates the distance D3 from the track center X0 to the measuring point P0 of the platform door 2 (= track door distance) by adding the distance D1 (= track measuring instrument distance) between the track center X0 and the measuring instrument reference point P1 (see Figures 4 and 5) to this D2 data.

In addition, in FIG. 4, there are cases where a display device is provided on the laser measuring devices 22a, 22b, and 22c, and the distance data signal S2 is not output to the outside. In this case, the operator can check the distance on the display device, input the distance data to the control device 29 via the input device 37 in FIG. 6, and perform the necessary calculation processing on this input distance data.

The bogie travel distance calculation unit 31 in Fig. 6 receives the output signal of the encoder 16 in Fig. 1 (i.e., the rotation speed signal of the wheels 16), and calculates the travel distance of the bogie 6 on the tracks 4a, 4b based on this output signal. The track-door distance calculation unit 32 receives the travel distance data of the bogie 6, which is the result of the calculation by the bogie travel distance calculation unit 31, and the distance from the track center line X0 to the obstacle sensor box 3 (= the overhanging part of the platform door 2), which is the result of the calculation by the track door distance calculation unit 30, and tallies the distance to the obstacle sensor box 2 for each position of the bogie moving on the track.

(Distance confirmation operation)
Since the distance measuring device 5 for platform doors of this embodiment is configured as described above, an operator first prepares a distance confirmation member 18 that complies with the standards of the railway company as shown in Figures 1 and 2. Then, this distance confirmation member 18 is attached to the upper part of the support pillar 9 of the bogie 6. Next, the wheels 15 of the bogie 6 are placed on the tracks 4a, 4b. Next, the operator pushes the bogie 6 by hand to move the bogie 6, and therefore the distance confirmation member 18, in parallel along the platform doors 2 in front of the platform doors 2.

In this embodiment, the installation position of the platform door 2 is determined as follows. That is, the platform door 2 is installed on the platform 1 so that the distance from the track center X0 to the obstacle sensor box 3 (i.e., the structure of the platform door 2 that protrudes most toward the track side) is within the "construction limit (e.g., 1550 mm) + margin (e.g., 20 mm)". Therefore, if there is no error in the installation position of the platform door 2, a gap (= space) of the margin is formed between the confirmation surface 18b of the distance confirmation member 18 and the obstacle sensor box 3. Therefore, by confirming that there is a gap between the confirmation surface 18b and the obstacle sensor box 3, it can be confirmed that the platform door 2 is correctly positioned on the platform side of the construction limit line G.

The worker moves the trolley 6 from the front end of the platform 1 to the back end and checks that the confirmation surface 18b of the distance confirmation member 18 does not come into contact with any part of the platform door 2. If contact is confirmed, appropriate action is taken with respect to the platform door.

(Distance measurement operation)
In Fig. 1, when it is desired to measure the distance from the track center line X0 to a measurement point P0 on the platform door 2, an operator first pushes the cart 6 by hand to move the cart 6 to the front of the target measurement point P0. Then, the operator operates the cart fixing device 17 to fix the cart 6 in an immovable position relative to the tracks 4a and 4b.

Next, the worker activates the necessary measuring device among the laser measuring devices 22a, 22b, and 22c in FIG. 1. The activated laser measuring devices 22a, 22b, and 22c irradiate laser light to the measuring point P0 in FIG. 4. At this time, the measuring device door distance calculation unit 25 calculates the distance (= measuring device door distance) D2 between the reference point P1 of the measuring devices 22a, 22b, and 22c and the measuring point P0 of the other side based on the light receiving signal S2. The distance data that is the calculation result is output as a measuring device door distance data signal S2.

The output distance data signal S2 is transmitted to the control device 29 in FIG. 6. The control device 29 adds the track measuring device distance D1 in FIG. 1 to the received data on the measuring device door distance D2 through the operation of the track door distance calculation unit 30. This addition calculation process obtains the track door distance D3 in FIG. 1. The obtained track door distance data is stored in the memory 33 as necessary, displayed on the display device 35 as necessary, or printed by the printer 36 as necessary.

(Adjustment of distance confirmation components)
As shown in Fig. 9, a triangulation device is installed at an appropriate position on the track, and highly accurate distance measurement can be performed by triangulation. For at least one of the measurement points P0 of the laser measuring devices 22a, 22b, and 22c, the mounting position of the distance confirmation member 18 and the laser emission position of the laser measuring device can be adjusted so that the accurate distance data obtained by triangulation and the actual measurement data obtained by the laser measuring device are the same. This can improve the reliability of the measurement data obtained by the distance measuring device for platform doors of this embodiment.

(Counting process operation)
An operator can determine the track door distance D3 in Fig. 1 at each position by using the laser measuring devices 22a, 22b, 22c while intermittently moving the bogie 6 on the tracks 4a, 4b at predetermined intervals. This allows the values of the track door distance D3 (see Fig. 1) at different positions of the laser measuring devices 22a, 22b, 22c along the tracks 4a, 4b to be compiled in the memory 33 in Fig. 6. This allows the overhang state of the platform screen doors 2 toward the track side from one end to the other of the platform 1 along the tracks 4a, 4b to be confirmed.

(Specific example)
When measurements were taken using the platform door distance measuring device 5 of Figure 1, the condition of the platform door 2 being measured was as follows.
In FIG.
(1) Distance L1 from the track center to the obstacle sensor box = 1570
(2) Margin L2 = 20
(3) Construction limit L3 = 1550
(4) Measuring instrument door distance L4 = 55
(5) Distance L5 of the laser emission position = 1495
(6) Inter-orbit distance L6 = 686
(7) Inter-orbit distance L7 = 686
(8) Distance between track supports L8 = 714
(9) Distance from the center of the track to the end face of the support pillar L9 = 1400
(10) Track width (inside) L10 = 1372
(11) Platform door height H1 = 1,300
(12) Short and long obstacle sensor box top height H2 = 1094.7
(13) Lower top height H3 of short obstacle sensor box = 350
(14) Height of bottom top of long obstacle sensor box H4 = 45
(15) Platform height from orbit H5 = 1090
(16) Height H6 of the reference point of the first laser measuring instrument = 2092.3
(17) Height H7 of the reference point of the second laser measuring instrument = 1550
(18) Height H8 of the reference point of the third laser measuring instrument = 1245
(19) Height H9 to the bottom end of the distance confirmation member = 1190

(Kant's Considerations)
Cant refers to raising the track on the outside of a curve and lowering the track on the inside of the curve when the track is curved. In other words, cant refers to tilting the track surface F formed by the apex of track 4a and the apex of track 4b in Fig. 1 so that the outside is higher. This cant is intended to prevent a vehicle from derailing to the outside of the track due to the centrifugal force acting on the vehicle when it travels around a curve. Cant is something that is determined by each railway company, just like the construction gauge.

The explanation so far in this specification has been based on the assumption that no cant occurs in the tracks 4a, 4b in Figure 1. In other words, the track surface F is a horizontal surface. However, cant can occur in actual tracks. Figure 8 shows the state of the distance measuring device for platform doors when cant occurs. In the figure, the distance measuring device for platform doors shown by the dashed line is the distance measuring device for platform doors in a state without cant, and the distance measuring device for platform doors shown by the solid line is the distance measuring device for platform doors in a state with cant.

（４）カントによる傾斜角度α＝ｔａｎ－１（カント／軌道内幅）
（５）傾斜基準点からレーザ測定器までの角度（rad）＝β１，β２，β３
β１＝ｔａｎ－１（Ｈ５１－軌道内幅／２）
β２＝ｔａｎ－１（Ｈ５２－軌道内幅／２）
β３＝ｔａｎ－１（Ｈ５３－軌道内幅／２）
（６）軌道中心からレーザ測定器までの水平距離（カントあり）
Ｌ５４＝Ｌ５１×ＣＯＳ（β１－α）＋軌道内幅／２
Ｌ５５＝Ｌ５２×ＣＯＳ（β２－α）＋軌道内幅／２
Ｌ５６＝Ｌ５３×ＣＯＳ（β３－α）＋軌道内幅／２
（７）支障物センサボックスの測定点（Ｊ１，Ｊ２，Ｊ３）
（８）レーザ実測値を水平方向に変換した値Ｋ
Ｋ＝レーザ実測値×ＣＯＳ（α）
（９）計算値（カントあり）Ｍ
Ｍ＝軌道中心から支障物センサボックスまでの水平距離
＝Ｌ５４＋Ｋ，Ｌ５５＋Ｋ，Ｌ５６＋Ｋ In FIG.
(1) Horizontal distance from the track center to the laser measuring instrument (without cant) L50
L50 = 1495 (fixed value)
(2) The vertical distance from the tilt reference point to the laser measuring device (laser emission point)
H51=2092.3, H52=1550, H53=1245
(3) Shortest distances L51, L52, and L53 from the tilt reference point to the laser measuring instrument

(4) Inclination angle due to cant α = tan-1 (cant/inner track width)
(5) Angle (rad) from tilt reference point to laser measuring instrument = β1, β2, β3
β1=tan-1 (H51-orbit inner width/2)
β2=tan-1 (H52-orbit inner width/2)
β3=tan-1 (H53-orbit inner width/2)
(6) Horizontal distance from the center of the track to the laser measuring device (with cant)
L54=L51×COS(β1-α)+orbit inner width/2
L55=L52×COS(β2-α)+orbit inner width/2
L56=L53×COS(β3-α)+orbit inner width/2
(7) Measurement points of the obstacle sensor box (J1, J2, J3)
(8) Value K obtained by converting the laser measurement value into the horizontal direction
K = Laser measured value x cos(α)
(9) Calculated value (with cant) M
M = horizontal distance from the track center to the obstacle sensor box
=L54+K, L55+K, L56+K

By writing the above calculated value M into the program software of the control device 29 in Figure 6, the "distance from the track center line X0 to the platform door measurement point" when a cant is present can be automatically obtained.

The above is a calculation formula that takes into account cant as an example of a case where the track is not in a normal state. However, in addition to cant, other cases where the track is not in a normal state include slack, where the rail width is slightly widened at curved sections to make it easier for vehicles to pass, and transition curves, which are installed to avoid the severe shock when entering another curve from a curved section. Slack and transition curves are also matters determined by each railway company. Therefore, by including the amount of slack due to slack and the inward and outward coefficients due to transition curves in the calculation formula that corresponds to each railway company, the horizontal distance from the track center to the obstacle sensor box can be accurately calculated even when slack or transition curves are present.

As is clear from the above explanation, according to this embodiment, the position of the obstacle sensor box 3 relative to the building limit line G is confirmed by the confirmation surface 18b of the distance confirmation member 18 in Figure 1, so the distance of the platform door 2 relative to the track center X0 can be confirmed easily and quickly.

In addition, by providing the laser measuring devices 22a, 22b, and 22c to the distance confirmation member 18, an inexpensive laser range finder with a short measurable distance can be used as the laser measuring device. As a result, the distance measuring device for platform doors can be manufactured inexpensively.

Other Embodiments
Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments and can be modified in various ways within the scope of the invention described in the claims.
For example, in the above embodiment, a point on the end face of the obstacle sensor box 3 was considered as the measurement point P0 of the platform door 2. However, the measurement point may be a point on any structure that protrudes toward the track side at the platform door 2.

In addition, in the above embodiment, three laser measuring devices are used, but the number of laser measuring devices can be one or more than three depending on the shape and size of the structure to be measured.

1: Platform, 2: Platform door, 3: Obstacle sensor box (projecting structure), 3a: Long obstacle sensor box, 3b: Short obstacle sensor box, 4a, 4b: Track, 5: Distance measuring device for platform door, 6: Bogie, 7: Frame, 8: Support member, 9: Support, 9a: Mounting surface, 10: Enclosure, 11: Door, 12: Reinforcing member, 13: Fixing element, 15: Wheel, 16: Encoder, 17: Bogie fixing device, 18: Distance confirmation member, 18a: Inner edge surface (mounting edge surface), 18b: Confirmation surface, 21a, 21b: Mounting plate, 22a: First laser measuring device, 22b: Second laser measuring device, 22c: Third laser measuring device, 23: Laser emitting element, 24: Laser receiving element, 25: Measurement Calculation unit for distance between the track doors, 26: Power supply, 29: Control device, 30: Track door distance calculation unit, 31: Cart movement distance calculation unit, 32: Track door distance calculation unit, 33: Memory, 34a, 34b, 34c: Input/output interface, 35: Display device, 36: Printer, 37: Input device, D0: Distance between surfaces for checking track, D1: Distance between track measuring devices, D2: Distance between measuring device doors, D3: Distance between track doors, E-E': Cart movement direction, F: Track surface, G: Construction limit line, J1, J2, J3: Measurement point of obstacle sensor box, P0: Measurement point, P1: Measurement reference point of measuring device, S1: Light receiving signal, S2: Data signal for distance between measuring device doors, Tr: Trigger signal, W: Width of distance confirmation member, X0: Track center line

Claims (7)

A distance measuring device for platform doors that measures the distance between a platform door installed on a platform at a railway station and the track,
A carriage movable on the track;
A support provided on the bogie;
A distance confirmation member provided on the upper portion of the support pillar,
the distance confirmation member has a first branch portion extending upward from the support pole and a second branch portion provided parallel to the first branch portion with a predetermined width therebetween, and an outer surface of the second branch portion is a confirmation surface;
The platform door is provided on the platform side of the construction limit line,
The support column, when the carriage is placed on the track,
the platform is disposed closer to the track side than the construction limit line, and extends in the vertical direction while facing the end of the platform on the track side,
The confirmation surface is disposed opposite to an end surface of the track-side protruding portion of the platform door,
the confirmation surface extends in the up-down direction along an end face of the track-side overhanging portion of the platform door, and a point of the confirmation surface closest to the platform door is on a construction limit line,
The distance confirmation member is detachable from the upper portion of the support pillar,
An attachment surface for fixing the first branch of the distance confirmation member is provided on the upper portion of the support pole, and the first branch is provided with an attachment side surface for fixing to the attachment surface.
A distance measuring device for platform doors. The platform door has a sensor that detects an obstacle between the platform door and the track, and an obstacle sensor box that has the sensor built in,
A distance measuring device for platform doors as described in claim 1, characterized in that the end face of the track side protrusion of the platform door is the track side end face of the obstacle sensor box. A laser measuring device is attached to the distance confirmation member so as to face the platform door,
The laser measuring device has a light emitting element that emits a laser beam toward a measuring point on the end face of the platform door on the track side, a light receiving element that receives the laser beam reflected at the measuring point and outputs a signal, and a measuring device door distance calculation means that calculates the distance between the laser measuring device and the measuring point based on the output signal from the light receiving element, and further,
The distance measuring device for platform doors as described in claim 1, characterized in that it has a track door distance calculation means for calculating the distance of the platform doors from the track based on the output signal of the measuring device door distance calculation means. A distance measuring device for platform doors as described in claim 3, characterized in that the mounting position of the distance confirmation member or the laser emission position of the laser measuring instrument is adjusted based on the distance data calculated by the track door distance calculation means and the distance data actually measured using triangulation. a carriage travel distance measuring means for measuring a distance traveled by the carriage on the track;
5. A distance measuring device for platform doors as described in claim 4, characterized in that it further comprises a track-door distance calculation means for determining the relationship between the distance of the platform door from the track and the travel distance of the bogie based on the distance data calculated by the track door distance calculation means and the distance data measured by the bogie travel distance measurement means. A plurality of the laser measuring devices are provided in the vertical direction of the distance confirmation member,
A distance measuring device for platform doors as described in claim 3, characterized in that the reference points for laser emission and laser reception of these laser measuring instruments are at the same position in the horizontal direction and different positions in the vertical direction. The distance measuring device for platform doors according to claim 1, characterized in that it has a bogie fixing means for fixing the bogie in a fixed position on the track.

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