Overhead wire height and deviation measuring device

Abstract

To provide an overhead wire height and deviation measuring device that is compact in size, wearable and portable by a worker, and capable of measurement without entering a railway track area.SOLUTION: A laser rangefinder 3 which emits and scans laser light in a crossing direction of a rail and an overhead wire of a railway track, and acquires position information thereof based on reflected light, is housed together with an attitude sensor 4 which detects an angle of a laser light scanning plane S with respect to the rail and a vertical line, in a housing body 2 to be worn on a body of a worker P. While the worker wearing the housing body 2 moves along the railway track, a computation unit 8 calculates the height and deviation of the overhead wire on the basis of the position information acquired by the laser rangefinder 3 and the angle of the laser light scanning plane S with respect to the rail and the vertical line detected by the attitude sensor 4. A terminal machine 6 equipped with the computation unit 8, a recording unit 9 which records the calculated height and deviation of the overhead wire, and a display unit 10 uses a compact personal computer, a tablet terminal, or a portable terminal equipped with a touch panel.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a measuring device for measuring the height of an overhead wire such as a trolley wire and the horizontal deviation in a direction perpendicular to the wire extension. [Background technology]

[0002] The height and horizontal deviation of the contact wire must be within specified values so that the pantograph can collect current stably, and maintaining the contact wire height and deviation properly is essential for train operation. The height and deviation of the contact wire are measured using a measuring instrument that has a T-shaped measuring frame consisting of a scaled horizontal and vertical rod attached to a support frame that spans both rails of a railway track, and the height and deviation of the contact wire are read by extending the vertical rod and placing the horizontal rod against the contact wire.As an improvement to this, Patent Document 1 discloses an overhead contact wire measuring device that has a light receiving tube mounted on a base that spans both rails and can rotate by a predetermined angle around the vertical position using a step motor, and that reads the irradiation inclination angle of the contact wire to calculate the height and deviation of the contact wire. Patent document 2 also discloses a trolley wire height and deviation measuring device that has a laser rangefinder fixed to an electric slider that can move back and forth laterally on a carriage equipped with wheels that can roll on the rails of a railway track, and that shines a laser toward the trolley wire to measure the height of the bottom of the trolley wire. Furthermore, Patent Document 3 discloses an overhead line measuring device that is equipped with a laser distance measuring device on a carriage running on a rail, which projects a laser beam in a fan shape perpendicular to the direction of extension of the rail and points vertically upward relative to the head surface of the rail, and calculates the height and horizontal displacement based on the deviation of the position where the reflected laser beam is imaged from a reference position. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-016608 [Patent Document 2] Japanese Patent Application Laid-Open No. 2015-178978 [Patent Document 3] Japanese Patent Application Publication No. 2019-015508 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-mentioned conventional measuring devices, a platform or carriage is placed between the rails, so the platform or carriage is wider than the rail spacing, making the device large and heavy overall. Furthermore, since the device requires entry into the railway tracks, measurement work can only be done during limited maintenance intervals while the tracks are in operation, or when the tracks are closed after operation has ended, which places location and time constraints on the measurement work. Furthermore, the burden of transporting the device is great. Therefore, an object of the present invention is to provide a small, compact, and highly mobile overhead wire height measurement device that can be carried by an operator and can be used to measure the height of railway lines without entering the tracks. [Means for solving the problem]

[0005] To solve the above-mentioned problems, the present invention provides an overhead line height and deviation measuring device 1 that includes a laser ranging device 3 that irradiates and scans the rails and overhead wires that make up the railway track in the direction in which they intersect and the surrounding equipment with a laser beam, and acquires position information of the irradiated object based on information on the reflected light; a calculation unit 8 that determines the overhead line and rails from the irradiated object based on the position information acquired by the laser ranging device and calculates the height of the overhead line and its deviation in the direction perpendicular to the rail extension; and output devices such as a recording unit 9 and a display unit 10 that record the height and deviation of the overhead line calculated by the calculation unit. The laser ranging device 3 is housed in a housing 2 worn on the body of a worker without obstructing the irradiation of the laser beam, together with an attitude sensor 4 that detects the angle of the laser beam scanning surface S relative to the rail and the vertical line. As the worker wearing the housing 2 moves along the railway track, the calculation unit 8 calculates the height and deviation of the overhead line based on the position information of the irradiated object detected by the laser ranging device 3 and the angle of the laser beam scanning surface S relative to the rail and the vertical line measured by the attitude sensor 4. [Effects of the Invention]

[0006] According to the present invention, the laser distance measuring device is small and compact and is housed in a housing that can be worn on the body, so that the height and deviation of the overhead wire can be measured by moving appropriately inside and outside the railway tracks together with the worker, thereby increasing the freedom to choose the time and location for the measurement work. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a block diagram showing the configuration of an overhead wire height and deviation measuring device according to an embodiment of the present invention; [Figure 2] FIG. 2 is an explanatory diagram of the measurement state of a worker wearing the overhead line height and deviation measuring device of FIG. 1. [Figure 3] FIG. 2 is an explanatory diagram showing the principle of measuring the height and deviation of a contact wire. [Figure 4] 1A is an explanatory diagram showing the principle of measuring the height of a contact wire, and FIG. 1B is an explanatory diagram showing the principle of measuring the deflection of a contact wire. [Figure 5] FIG. 2 is an explanatory diagram of a measurement state by a laser distance measuring device. [Figure 6] 10 is a graph of a point cloud showing the positional relationship of an object illuminated by a laser distance measuring device. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of the present invention will be described with reference to the drawings. In Figures 1 and 2, the overhead line height and deviation measuring device 1 comprises a housing 2 that can be worn on the body of an operator, a laser distance measuring device 3 housed in the housing 2, an attitude sensor 4 fixed in a position close to the laser distance measuring device 3 on the housing 2, a driving power supply 5 housed in the housing 2 and supplying driving power to the laser distance measuring device 3 and the attitude sensor 4, and a terminal device 6.

[0009] The container 2 is a housing or a bag with a frame that can house the laser distance measuring device 3 and emit laser light without hindrance, and can be worn on the body of the worker P, such as by being carried on the back, and is preferably in the form of a backpack, for example.

[0010] The laser ranging device 3 uses a ranging sensor such as a 2D-LiDAR, and emits and scans laser light while exposed from the housing 2 so that the laser irradiation is not obstructed by the housing 2 as shown in Figure 2, and obtains position information of the target based on the reflected light within the laser light scanning surface S in a certain direction.

[0011] As shown in FIG. 3, the attitude sensor 4 detects angles θ and φ of the laser light scanning surface S with respect to the rails Rl and Rr and the vertical axis y.

[0012] The terminal device 6 is equipped with a recording trigger 7, a calculation unit 8 that calculates the height of the contact wire and the horizontal deviation of the rail in the direction perpendicular to the extension direction based on the position information acquired by the laser distance measuring device 3 and the attitude angle detected by the attitude sensor 4, and a recording unit 9 and a display unit 10 that are output devices that record the height and deviation of the contact wire calculated by the calculation unit 8. The terminal device 6 is a general-purpose information terminal in terms of portability, operability, and connectivity with the laser distance measuring device 3 and the attitude sensor 4, and can be connected to the laser distance measuring device 3 and the attitude sensor 4 via short-range wireless communication such as Bluetooth, and is preferably a small personal computer with a touch panel, a tablet terminal, or a mobile terminal.

[0013] The recording trigger 7 is an operating means that has the function of transmitting measurement timing to the laser distance measuring device 3 and the attitude sensor 4, and is preferably an operating icon on a touch panel, but may also be a mechanical switch electrically connected to the laser distance measuring device 3 and the attitude sensor 4.

[0014] The calculation unit 8 corresponds to the CPU of the information terminal serving as the terminal device 6, operates the laser distance measuring device 3 and the attitude sensor 4, receives detection data from them, and calculates and processes measurement values according to a predetermined program. The calculation unit 8 of the terminal device 6 may be limited to the function of collecting the detection data, and the CPU of a remote server may perform the function of calculating measurement values by centrally processing the detection data.

[0015] The recording medium 9 is built into the information terminal as the terminal device 6, but may also be a memory card or a remote server via communication. The display unit 10 functions as a touch panel of an information terminal as the terminal device 6, but may also be a monitor connected to the remote server.

[0016] The calculation unit 4 calculates the height and deviation of the contact wire as follows. As shown in Fig. 3, in a coordinate system with the origin O as the reference position of the position information based on the laser irradiation of the laser ranging device 3, the x-axis as the direction of the sleepers, the y-axis as the vertical direction, and the z-axis as the direction of the rail extension, the angle θ of the laser beam scanning plane S of the attitude sensor 4 with respect to the x-axis and the angle φ with respect to the y-axis are defined. Also, as shown in Fig. 4(A), the top of the left rail Rl is defined as coordinates (X1, Y1), the top of the right rail Rr is defined as coordinates (X2, Y2), and the intersection position Tr of the laser beam scanning plane S with the contact wire is defined as coordinates (X, Y). The center position Rc between the rails, which serves as the reference for deviation, has coordinates ((X1 + X2) / 2, (Y1 + Y2) / 2), and the deviation of the contact wire on the XY plane within the laser beam scanning plane S is X - (X1 + X2) / 2. Therefore, the actual contact wire deflection x in the xyz coordinate system is the x-axis projection component of the contact wire deflection on the XY plane within the laser beam scanning plane S, and is given by x=(X-(X1+X2) / 2)cosθ Here, if the specified rail spacing of 1067 mm or 1435 mm is Li, then cosθ=Li / (X1-X2), so x=(X-(X1+X2) / 2)×Li / (X1-X2) Therefore, the deviation of the contact wire can be calculated from the detection data of the laser distance measuring device 3 and the attitude sensor 4.

[0017] As shown in Figure 4(B), the height of the contact wire on the XY plane within the laser beam scanning surface S is the sum (Y1+Y2) / 2+Y of the y coordinate Y of the intersection position Tr' of the contact wire with the laser beam scanning surface S and the y coordinate (Y1+Y2) / 2 of the center position Rc between the rails. The actual height y in the xyz coordinate system is the y-axis projection component of the contact wire height on the XY plane, so y=((Y1+Y2) / 2+Y)cosφ Therefore, the height of the contact wire can be calculated from the detection data of the laser distance measuring device 3 and the attitude sensor 4.

[0018] In this overhead contact line height and deviation measuring device, the measurement worker wears the housing 2 on his body and performs measurements intermittently while moving along the railway track, either on or off the track, or stopping at desired locations. As shown in Figure 5, the height and deviation of the trolley are calculated based on the above principle from the position information of the contact wire and rail, which are the targets of laser light irradiation by the laser distance measuring device 3. The necessary equipment is stored in the housing 2, which can be worn on the body, making it small and compact, and increasing the flexibility in choosing work times and work locations.

[0019] The height and deviation of the trolley wire are calculated by the laser ranging device 3 as described above, but the position information detected as the target of irradiation is point cloud data that includes not only the trolley wire and rail but also surrounding metal fittings and structures, as shown in Figure 6.Therefore, to identify the trolley wire and rail from this, for example, accurate measurement values of a specific position can be recorded as data in advance, and points with close positional relationships can be compared using pattern matching from the point cloud of the target of irradiation with the laser light, or a marker with an easily identifiable outline, such as a sphere, can be placed on the top of the rail at the measurement position, as shown in Figure 5, and its shape can be read and used to make a judgment.This can be done using well-known judgment methods. [Explanation of symbols]

[0020] 1. Overhead line height and deviation measuring device 2. Containment Unit 3 Laser distance measuring device 4. Attitude sensor 5. Drive power supply 6 Terminal 7 Recording Trigger 8 Arithmetic section 9 Recording section 10 Display

Claims

[Claim 1] a laser distance measuring device that irradiates and scans the rails and overhead wires that make up the railway track and peripheral equipment with a laser beam in the direction of intersection of these and acquires position information of the irradiated target based on the reflected light; a calculation unit that determines the overhead line and the rail from the irradiation target based on the position information of the irradiation target acquired by the laser distance measuring device and calculates the height of the overhead line and the horizontal deviation in the direction perpendicular to the rail extension; and an output device that records the height and deviation of the overhead line calculated by the calculation unit. a housing that can house the laser distance measuring device without obstructing the laser light and can be worn on the body of an operator; and a posture sensor that detects the angle of the laser beam scanning surface relative to the rail and the vertical line during measurement with the container attached, An overhead line height and deviation overhead line measuring device characterized in that, while a worker wearing the container moves along the railway tracks, the calculation unit calculates the height and deviation of the overhead line based on the position information of the target to be irradiated detected by the laser ranging device and the angle of the laser light scanning surface of the posture sensor relative to the rail and vertical line.

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