Trolley wire

Abstract

To provide a trolley wire which does not require an expensive system for wear management and facilitates wear inspection by observing the appearance of the trolley wire at night.SOLUTION: The trolley wire 1 includes a trolley wire body 10 having a hole 14 extending along the length direction on at least one side of a center line 15, and a film 20 provided along the length direction inside the hole 14 and having at least one of reflectivity and fluorescence.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a contact wire. [Background technology]

[0002] Conventionally, there is known a trolley wire that incorporates a wear detection wire that uses an optical fiber, an insulated wire, or the like (see, for example, Patent Document 1). According to a wear detection system that uses a trolley wire that incorporates a wear detection wire, when wear on the trolley wire progresses and the wear detection wire breaks, the break can be detected and it can be known that the wear limit is approaching.

[0003] Also, conventionally, there is known a trolley wire having a groove for wear detection on its surface (see, for example, Patent Document 2). With a trolley wire having a groove for wear detection, the wear state can be known by observing the state of the surface having the groove from the ground, without directly measuring the remaining height of the trolley wire with a micrometer or the like. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-141348 [Patent Document 2] Jikko No. 42-8903 Summary of the Invention [Problem to be solved by the invention]

[0005] However, wear detection systems using trolley wires with built-in wear detection wires have the disadvantage that the introduction and maintenance costs of the system are very high. Also, although trolley wires with wear detection grooves do not require expensive systems for wear management, they have difficulty in visibility from long distances in dark places, and it may be difficult to inspect the wear by visual observation at night when trains are not running.

[0006] An object of the present invention is to provide a trolley wire that does not require an expensive system for wear management and that allows for easy wear detection by visually observing the trolley wire at night. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the present invention provides a trolley wire comprising a trolley wire body having a hole extending along its length on at least one side of a center line, and a wear detection material having at least one of reflectivity and fluorescence properties and arranged inside the hole along the length. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a trolley wire that does not require an expensive system for wear management and that allows for easy wear detection by visually observing the trolley wire at night. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a radial cross-sectional view of a contact wire according to an embodiment of the present invention. [Figure 2] FIG. 2 is a radial cross-sectional view of a trolley wire body on which linear grooves are formed during the wire drawing process. [Figure 3] FIG. 3 is a radial cross-sectional view of a modified example of the contact wire according to the embodiment of the present invention. [Figure 4] FIG. 4 is a radial cross-sectional view of a modified example of the contact wire according to the embodiment of the present invention. [Figure 5] FIG. 5 is a radial cross-sectional view of a modified example of the trolley wire according to the embodiment of the present invention. [Figure 6] FIG. 6 is a radial cross-sectional view of a modified example of the contact wire according to the embodiment of the present invention. [Figure 7] FIG. 7 is a radial cross-sectional view of a modified example of the trolley wire according to the embodiment of the present invention. [Figure 8] FIG. 8 is a radial cross-sectional view of a modified example of the trolley wire according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] (Contact wire configuration) 1 is a radial cross-sectional view of a trolley wire 1 according to an embodiment of the present invention. The trolley wire 1 includes a trolley wire body 10 having two holes 14 extending along its length, and a film 20 serving as a wear detection material having at least one of reflectivity and fluorescence, which is provided inside the two holes 14 and along the length of the trolley wire body 10.

[0011] The trolley wire body 10 is a deformed round trolley wire and has a small arc surface 11 at the top, a large arc surface 12 at the bottom, V-shaped ear grooves 13 for connecting ear fittings between the small arc surfaces 11 and the large arc surfaces 12 on both sides, and a linear hole 14 provided along the length of the trolley wire body 10 at a predetermined distance from the bottom of the large arc surface 12. The shape of the trolley wire body 10 corresponds to the shape of a grooved hard copper trolley wire specified in, for example, JISE2101 or IEC62917. The trolley wire body 10 has a length corresponding to the distance of the overhead line section of a Shinkansen line or the like.

[0012] The nominal cross-sectional area of ​​the trolley wire body 10 is, for example, 150 mm 2 (150SQ) or more and 175mm 2 (175SQ) or less. Here, the nominal cross-sectional area refers to the calculated cross-sectional area assuming that the holes 14 are not provided. The trolley wire body 10 is mainly composed of a copper alloy, for example, a Cu-Sn-In based alloy or a Cu-Sn based alloy.

[0013] When power is supplied to a train via the trolley wire 1, the bottom of the large arc surface 12 of the trolley wire body 10 comes into contact with the train's current collector, such as a pantograph. As a result, the sliding of the current collector causes wear of the trolley wire body 10, starting from the bottom of the large arc surface 12. Generally, the limit at which a worn trolley wire can maintain sufficient strength for safe use is called the wear limit.

[0014] The wear limit position 16 is a position in the height direction (parallel to the center line 15) of the contact wire 1 that indicates the wear limit of the contact wire 1 when uneven wear occurs, making the wear surface horizontal. If uneven wear progresses beyond the wear limit position 16, the cross-sectional area will fall below the level at which the strength required for safe use can be maintained, increasing the risk of wire breakage.

[0015] When inspecting the wear of the trolley wire 1, for example, the appearance of the laid trolley wire 1 is observed from the ground while illuminating it. If the wear of the trolley wire 1 progresses to the point where the film 20 in the hole 14 is exposed, the observer can visually confirm that the film 20 is exposed by reflecting the illumination light on the film 20 or emitting fluorescence from the film 20 that receives the illumination light. In other words, by observing the exposure of the film 20 or the disappearance of the film 20 that has been confirmed to be exposed, the degree of wear of the trolley wire 1 can be known.

[0016] The film 20 is, for example, a film made of a base material such as a transparent resin containing a reflective material such as beads, or a film made of a fluorescent material. When observing the appearance of the trolley wire 1, it is preferable that the film 20 has a chromatic color (the reflected light or fluorescence has a chromatic color) so that light reflected by the film 20 can be distinguished from light reflected by other parts. The film 20 is provided inside the hole 14 along the longitudinal direction of the trolley wire body 10 so as to cover the inner surface of the hole 14, and is typically provided over the entire length of the trolley wire body 10.

[0017] The hole 14 is provided at a position close to but below the wear limit position 16, for example, at a position where the position of its upper end coincides with the wear limit position 16 of the trolley wire body 10. Therefore, from the exposure or disappearance of the membrane 20 in the hole 14 due to wear, it can be known that the wear has reached or is about to reach the wear limit position 16. According to the trolley wire 1, for example, preparation for replacement can be started when the exposure of the membrane 20 is confirmed, and replacement can be carried out when the disappearance of the membrane 20 is confirmed or is about to be lost.

[0018] Typically, as shown in Fig. 1, two holes 14 are provided, one on each side of the center line 15 of the contact wire body 10, and a membrane 20 is provided inside each of the two holes 14. By using the two holes 14 on both sides of the center line 15 and the membranes 20 contained therein, wear can be detected even when uneven wear (inclined wear) occurs.

[0019] When the contact wire 1 is strung in a curved section or other such case where it is clear that there is a difference in the rate of wear on both sides of the center line 15, the holes 14 and the membrane 20 may be provided only on one side of the center line 15. In this case, the contact wire 1 is strung in a direction such that the rate of wear is greater on the side where the holes 14 and the membrane 20 are provided. When the holes 14 and the membrane 20 are provided on one side of the center line 15, the manufacturing cost can be kept lower compared to when they are provided on both sides.

[0020] (Method of manufacturing contact wire) In manufacturing the trolley wire 1, the trolley wire body 10 is processed by wire drawing using a trolley wire die, and in the process, the film 20 is formed inside the hole 14 of the trolley wire body 10. An example of a method for manufacturing a trolley wire will be described below.

[0021] The hole 14 in the trolley wire body 10 can be formed by the same method as that for accommodating a wear detection wire in a conventionally known trolley wire that incorporates a wear detection wire such as an optical fiber or an insulated wire. Specifically, as shown in Fig. 2, a linear groove 140 extending along the longitudinal direction of the trolley wire body 10 is formed on the surface of the trolley wire body 10 during the wiredrawing process of the trolley wire body 10. Then, the opening 141 of the linear groove 140 is closed by the subsequent wiredrawing process, thereby forming the hole 14.

[0022] The film 20 is formed by applying reflective paint or fluorescent paint to the inner surface of the linear groove 140 by spraying or rolling at the stage when the linear groove 140 is formed during the wire drawing process of the trolley wire body 10. After forming the film 20, the opening 141 of the linear groove 140 is closed to form the hole 14.

[0023] The reflective paint to be applied to the inner surface of the linear groove 140 may be, for example, an ink composition containing glass beads, an adhesive resin, and mica (thin plate-like mica particles), as disclosed in JP 2000-303011 A, or an ink composition containing glass beads, an adhesive resin, and colored aluminum particles.

[0024] Furthermore, examples of the fluorescent paint to be applied to the inner surface of the linear groove 140 include a paint such as that disclosed in Japanese Patent Laid-Open Publication No. 2009-161688 (a paint containing a fluorescent pigment as a colorant, which is formed by further dyeing with a fluorescent dye seed polymer particles that encapsulate vinyl copolymer particles dyed with a fluorescent dye), and a paint containing a colored resin fine powder composition as disclosed in Japanese Patent Publication No. 51-5678 (a colored resin fine powder composition obtained by co-condensing a guanamine derivative having a spiro ring structure, an aromatic sulfonamide, and a compound such as phthalic anhydride with formaldehyde, coloring the compound with a colorant, and micronizing the resulting mixture).

[0025] Furthermore, when forming a film 20 that has both reflectivity and fluorescence, for example, the above-mentioned reflective paint and fluorescent paint are mixed and applied to the inner surface of the linear groove 140 .

[0026] (Variation) Fig. 3 is a radial cross-sectional view of a trolley wire 1a, which is a modified example of the trolley wire 1 according to the embodiment of the present invention. In the example shown in Fig. 3, holes 14 and membranes 20 are provided at two positions at different heights, and the lower and upper holes 14 are represented as holes 14a and 14b, respectively, and the lower and upper membranes 20 are represented as membranes 20a and 20b, respectively.

[0027] The number of holes 14 and membranes 20 provided at different height positions in the trolley wire 1a may be three or more. That is, in the trolley wire 1a, the holes 14 and membranes 20 are provided at multiple positions at different heights on both sides of the center line 15 of the trolley wire body 10.

[0028] With the trolley wire 1a, the remaining condition of the film 20 inside the lower hole 14 makes it possible to know when uneven wear will occur before the upper hole 14 and film 20 disappear, and to predict in advance when the trolley wire 1a should be replaced.

[0029] In the trolley wire 1a, the uppermost hole 14 (hole 14b in the example shown in Figure 3) is provided at a position close to the wear limit position below the wear limit position 16, for example, at a position where its upper end coincides with the wear limit position 16 of the trolley wire body 10.

[0030] 3, a lower hole 14a and an upper hole 14b are provided on both sides of the center line 15. In this case, for example, when observing the appearance of the trolley wire 1a, preparations for replacing the trolley wire 1a can be started when it is confirmed that the film 20a inside the lower hole 14a has disappeared, and replacement of the trolley wire 1a can be carried out when it is confirmed that the film 20b inside the upper hole 14b has disappeared.

[0031] In addition, when the contact wire 1a is strung in a curved section or other such case where it is clear that there is a difference in the rate of wear on both sides of the center line 15, holes 14 (e.g., holes 14a and 14b) and membranes 20 (e.g., membranes 20a and 20b) may be provided at multiple positions at different heights on one side of the center line 15. In this case, the contact wire 1a is strung in a direction such that the rate of wear on the side where the holes 14 and membranes 20 are provided is greater. When the holes 14 and membranes 20 are provided on one side of the center line 15, manufacturing costs can be kept lower compared to when they are provided on both sides.

[0032] Preferably, the holes 14 provided at different heights each include a film 20 of a different color (different colors of reflected light or fluorescence) inside. In this case, when observing the appearance of the trolley wire 1a, it becomes easy to determine which hole 14 and the film 20 remaining inside it. In the example shown in Fig. 3, it is preferable that the color of the film 20a provided inside the hole 14a is different from that of the film 20b provided inside the hole 14b.

[0033] 4 is a radial cross-sectional view of a trolley wire 1b, which is a modified example of the trolley wire 1 according to the embodiment of the present invention. In the trolley wire 1b, inside each hole 14, a film 20, which is a wear detection material, has multiple portions of different colors (different colors of reflected light or fluorescent light) aligned along the height direction of the trolley wire body 10 (direction parallel to the center line 15). By observing how much of the film 20 remains, the progress of wear can be known in detail.

[0034] 4, the film 20 is composed of a lower part 20c and an upper part 20d having different colors inside each hole 14. In this case, when observing the appearance of the contact wire 1b, it is possible to determine the subtle difference in the degree of wear depending on whether the lower part 20c is visible or only the upper part 20d is visible.

[0035] In the trolley wire 1b, for example, a film 20 having multiple parts of different colors is formed by applying multiple paints of different colors to the inner surface of the linear groove 140 (a groove that becomes a hole 14 by closing the opening 141) using multiple rollers containing paints of different colors or a roller having multiple parts containing different colors.

[0036] 5 is a radial cross-sectional view of a trolley wire 1c, which is a modified example of the trolley wire 1 according to the embodiment of the present invention. In the trolley wire 1c, the holes 14 have a vertically elongated shape. Here, "vertically elongated" means that in the radial cross-section of the trolley wire body 10, the longitudinal direction is close to the height direction of the trolley wire body 10 (direction parallel to the center line 15) (for example, the angle (acute angle) between the longitudinal direction of the holes 14 in the radial cross-section of the trolley wire body 10 and the height direction of the trolley wire body 10 is 3° or less).

[0037] According to the trolley wire 1c, for example, when observing the appearance of the trolley wire 1c, preparation for replacement begins when exposure of the membrane 20 is confirmed, and replacement is carried out when disappearance of the membrane 20 is confirmed, and the vertical length can be adjusted according to the preparation period for replacement.

[0038] In addition, in the above-mentioned trolley wire 1b, in which the membrane 20 has multiple parts of different colors lined up along the height direction of the trolley wire body 10, it is preferable that the holes 14 are vertically elongated like the trolley wire 1c, in order to ensure sufficient height for each of the multiple parts of the membrane 20 with different colors.

[0039] In addition, in a trolley wire that has a built-in wear detection wire, the hole that accommodates the wear detection wire is required to have an approximately circular cross-sectional shape, taking into consideration the ease of movement of the wear detection wire inside the hole, in order to prevent unintentional breakage of the wear detection wire, etc., but the cross-sectional shape of hole 14 that does not accommodate a wear detection wire is not particularly limited.

[0040] 6 is a radial cross-sectional view of a trolley wire 1d, which is a modified example of the trolley wire 1 according to the embodiment of the present invention. In the trolley wire 1d, the holes 14 have a horizontally elongated shape. Here, horizontally elongated means that in the radial cross-section of the trolley wire body 10, the longitudinal direction is close to the width direction of the trolley wire body 10 (the direction perpendicular to the center line 15) (for example, the angle (acute angle) between the longitudinal direction of the holes 14 and the width direction of the trolley wire body 10 in the radial cross-section of the trolley wire body 10 is 3° or less).

[0041] According to the trolley wire 1d, for example, when holes 14 (holes 14a and 14b in the example shown in FIG. 6) are provided at multiple positions at different heights, it is easy to ensure space in the height direction of the trolley wire body 10. That is, in the trolley wire 1a described above, by making the holes 14 provided at multiple positions at different heights each have a horizontally elongated shape, it is easy to ensure space in the height direction for each hole 14.

[0042] 7 is a radial cross-sectional view of a trolley wire 1e, which is a modified example of the trolley wire 1 according to the embodiment of the present invention. In the trolley wire 1e, a linear object 21 housed in the hole 14 is used as a wear detection material having at least one of reflectivity and fluorescence. The linear object 21 is provided inside the hole 14 along the longitudinal direction of the trolley wire body 10, and typically, is provided over the entire length of the trolley wire body 10.

[0043] The linear object 21 is, for example, a linear object made of a base material such as a transparent resin containing a reflective material such as a bead material, or a linear object made of a fluorescent material. When observing the appearance of the trolley wire 1e, it is preferable that the linear object 21 has a chromatic color (the reflected light or fluorescence has a chromatic color) so that light reflected by the linear object 21 can be distinguished from light reflected by other parts.

[0044] When inspecting the wear of the trolley wire 1e, for example, the appearance of the suspended trolley wire 1 is observed from the ground while illuminating it, just like the trolley wire 1. If the wear of the trolley wire 1e progresses to the point where the linear object 21 in the hole 14 is exposed, the observer can visually confirm that the linear object 21 is exposed by reflecting the illumination light on the linear object 21 or by emitting fluorescence from the linear object 21 that receives the illumination light. In other words, by observing the exposure of the linear object 21, the degree of wear of the trolley wire 1e can be known.

[0045] In manufacturing the trolley wire 1e, the linear object 21 is inserted into the linear groove 140 at the stage when the linear groove 140 is formed in the process of drawing the trolley wire body 10. After the linear object 21 is inserted, the opening 141 of the linear groove 140 is closed by drawing the trolley wire body 10, thereby forming the hole 14 in which the linear object 21 is accommodated.

[0046] Furthermore, the linear object 21 can be used, for example, in place of the membranes 20 inside the holes 14 (membranes 20a and 20b inside the holes 14a and 14b illustrated in FIG. 3) provided at multiple positions at different heights in the above-mentioned trolley wire 1a. In this case, it is preferable that the linear objects 21 accommodated in the holes 14 (holes 14a and 14b illustrated in FIG. 3) provided at multiple positions at different heights have different colors (different colors of reflected light or fluorescent light). Furthermore, the holes 14 that accommodate the linear objects 21 may be elongated vertically or horizontally.

[0047] 8 is a radial cross-sectional view of a trolley wire 1f, which is a modified example of the trolley wire 1 according to the embodiment of the present invention. In the trolley wire 1f, a filler 22 filled in the holes 14 is used as a wear detection substance having at least one of reflectivity and fluorescence. The filler 22 is provided inside the holes 14 along the longitudinal direction of the trolley wire body 10, and typically provided over the entire length of the trolley wire body 10.

[0048] The filler 22 is, for example, a filler made of a base material such as a transparent resin containing a reflective material such as beads, or a filler made of a fluorescent material. In order to distinguish light reflected by the filler 22 from light reflected by other parts when observing the appearance of the trolley wire 1f, it is preferable that the filler 22 has a chromatic color (the reflected light or fluorescence has a chromatic color).

[0049] When inspecting the wear of the trolley wire 1f, for example, the appearance of the laid trolley wire 1 is observed from the ground while illuminating it, similar to the trolley wire 1. If the wear of the trolley wire 1f progresses to the point where the filler 22 in the hole 14 is exposed, the observer can visually confirm that the filler 22 is exposed by reflecting the illumination light on the filler 22 or by emitting fluorescence from the filler 22 that receives the illumination light. In other words, by observing the exposure or disappearance of the filler 22, the degree of wear of the trolley wire 1f can be known.

[0050] In manufacturing the trolley wire 1f, the filler material 22 is filled into the linear grooves 140 at the stage when the linear grooves 140 are formed during the wiredrawing process of the trolley wire body 10. For example, the filler material 22 is filled in a liquid state and then hardened. After filling with the filler material 22, the openings 141 of the linear grooves 140 are closed by wiredrawing the trolley wire body 10, thereby forming the holes 14 in which the filler material 22 is accommodated.

[0051] As a method for filling the liquid filler 22 into the linear groove 140, for example, a method of closing the opening 141 while immersing the trolley wire body 10 on which the linear groove 140 is formed in the liquid filler 22, or a method of filling the linear groove 140 in air with the gel or paste filler 22 and then closing the opening 141 can be used. Note that the gel or paste filler 22 filled into the linear groove 140 in air preferably has a viscosity that does not easily drop from the linear groove 140 whose opening 141 faces downward.

[0052] Furthermore, the filler 22 can be used, for example, in place of the membranes 20 inside the holes 14 (membranes 20a and 20b inside the holes 14a and 14b illustrated in FIG. 3) provided at different heights in the above-described trolley wire 1a. In this case, it is preferable that the fillers 22 housed in the holes 14 (holes 14a and 14b illustrated in FIG. 3) provided at different heights have different colors (different colors of reflected light or fluorescent light). Furthermore, the holes 14 filled with the filler 22 may be elongated vertically or horizontally.

[0053] Furthermore, it is preferable that the wear detection material, which is the film 20, linear object 21, or filler 22 in the trolley wires 1, 1a to 1f described above, is not exposed to the outside before the trolley wires 1, 1a to 1f are used, but is only exposed after a certain amount of wear due to use of the trolley wires 1, 1a to 1f.

[0054] (Effects of the embodiment) According to the trolley wires 1, 1a to 1f of the present embodiment of the present invention, the wear detection material having at least one of reflectivity and fluorescence, such as the film 20, linear object 21, and filler 22, is provided inside the hole 14, facilitating wear detection by visual observation at night. Furthermore, since there is no need for an expensive system such as that used for a trolley wire incorporating a wear detection wire, the trolley wires can be introduced to railway tracks at a relatively low cost. Furthermore, since the wear detection material is provided inside the hole 14, deterioration due to wind, rain, ultraviolet rays, etc. is suppressed.

[0055] (Summary of the embodiment) Next, the technical ideas grasped from the above-described embodiments will be described by using the reference numerals and the like in the embodiments. However, the reference numerals and the like in the following description do not limit the components in the claims to the members and the like specifically shown in the embodiments.

[0056] [1] A trolley wire (1, 1a to 1f) comprising a trolley wire body (10) having a hole (14) extending along the length of the center line (15) on at least one side thereof, and a wear detection material (20, 21, 22) having at least one of reflectivity and fluorescence, provided inside the hole (14) along the length.

[0057] [2] The trolley wire (1, 1a to 1d) according to the above [1], wherein the wear detection material (20, 21, 22) is a film (20) covering the inner surface of the hole (14).

[0058] [3] The contact wire (1e) according to the above [1], wherein the wear detection material (20, 21, 22) is a linear object (21) housed in the hole (14).

[0059] [4] The contact wire (1f) according to the above [1], wherein the wear detection material (20, 21, 22) is a filler (22) filled in the hole (14).

[0060] [5] A trolley wire (1a) according to any one of the above [1] to [4], wherein the holes (14a, 14b) and the wear detection materials (20, 21, 22) are provided at multiple positions at different heights on at least one side of the center wire (15) of the trolley wire body (10).

[0061] [6] The trolley wire (1a) described in [5] above, wherein the holes (14a, 14b) provided at the plurality of positions at different heights each contain the wear detection material (20, 21, 22) of a different color inside.

[0062] [7] A trolley wire (1b) as described in [2] above, wherein inside each of the holes (14), the wear detection material (20) has multiple portions of different colors arranged along the height direction of the trolley wire body (10).

[0063] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and various modifications can be made without departing from the spirit of the invention. Furthermore, the above-described embodiments do not limit the scope of the invention according to the claims. It should be noted that not all of the combinations of features described in the embodiments are necessarily essential to the means for solving the problems of the invention. [Explanation of symbols]

[0064] 1, 1a~1f Contact wire 10 Contact wire body 14 holes 15 Center line 20 membrane 21 Linear objects 22 Filling material

Claims

1. a contact wire body having a hole extending along the length of the contact wire on at least one side of the centerline; a wear detection material having at least one of reflectivity and fluorescence, the wear detection material being provided inside the hole along the length direction; Equipped with Trolley wire.

2. The wear detection material is a film covering the inner surface of the hole. The contact wire according to claim 1.

3. The wear detection material is a linear object accommodated in the hole. The contact wire according to claim 1.

4. The wear detection material is a filler material filled in the holes. The contact wire according to claim 1.

5. the holes and the wear detection materials are provided at a plurality of positions at different heights on at least one side of the center line of the trolley wire body, The trolley wire according to any one of claims 1 to 4.

6. the holes provided at the plurality of positions of different heights contain the wear detection material of different colors inside, The trolley wire according to claim 5.

7. Inside each of the holes, the wear detection material has a plurality of portions of different colors arranged along the height direction of the contact wire body. The trolley wire according to claim 2.

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