Trolley wire and method for managing wear of trolley wire

Abstract

The present invention provides a trolley wire equipped with highly visible wear detection grooves suitable for marking, and which suppresses variations in tilt angle and twisting caused by the wear detection grooves when the wire is wound horizontally, as well as a method for managing trolley wire wear using the trolley wire. [Solution] A trolley wire 1 is provided, which has a linear wear detection groove 14 along the longitudinal direction provided below the wear limit position 16 on one side, and the height distance L1 between the upper end and lower end of the wear detection groove 14 is 1.5 mm or more and 2.0 mm or less.

Description

[Technical Field]

[0001] This invention relates to a trolley wire used in railway tracks and a method for managing wear of the trolley wire. [Background technology]

[0002] Conventionally, trolley wires are known that have linear wear detection grooves along the longitudinal direction on both sides (see Patent Document 1). With a trolley wire equipped with wear detection grooves, such as the trolley wire described in Patent Document 1, the wear state of the trolley wire can be determined from the condition of the wear detection grooves by observing the side surface of the trolley wire visually or with a camera. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2021-59248 [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] It is generally known that in overhead catenary lines, wear progresses rapidly at the point where the ear fittings are connected. This is because, when the train's pantograph slides along the underside of the trolley wire, upward movement is restricted at the point where the ear fittings are connected due to the weight of the fittings. Therefore, it is preferable to mark the trolley wire to make it easier to locate the point where the ear fittings are connected when inspecting the trolley wire for wear by observing the wear detection grooves.

[0005] On the other hand, trolley wire equipped with wear detection grooves has a problem in that when wound horizontally around a drum, the irregularities on the sides caused by the wear detection grooves come into contact with the surface of the drum body, easily causing variations in the tilt angle and twisting. Furthermore, if the width and depth of the wear detection grooves are reduced to avoid these problems, the visibility of the wear detection grooves decreases.

[0006] The object of the present invention is to provide a trolley wire equipped with highly visible wear detection grooves suitable for marking, and which suppresses variations in the inclination angle and twisting caused by the wear detection grooves when wound horizontally, and a method for managing the wear of a trolley wire using the trolley wire. [Means for solving the problem]

[0007] The present invention aims to solve the above problems by providing a trolley wire equipped with a linear wear detection groove along the longitudinal direction, located below the wear limit position on one side, wherein the height distance between the upper and lower ends of the wear detection groove is 1.5 mm or more and 2.0 mm or less.

[0008] Furthermore, the present invention aims to solve the above problems and provides a method for managing wear of a trolley wire to which an ear fitting is connected, comprising the steps of: marking a portion of a wear detection groove, which is provided below the wear limit position on one side of the trolley wire, by applying paint to the portion located below the ear fitting; and inspecting the wear state of the trolley wire by observing the appearance of the vicinity of the marked portion. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a trolley wire equipped with highly visible wear detection grooves suitable for marking, and in which variations in the inclination angle and twisting caused by the wear detection grooves when the trolley wire is wound horizontally are suppressed, as well as a method for managing the wear of the trolley wire using the trolley wire. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a radial cross-sectional view of a trolley wire according to an embodiment of the present invention. [Figure 2] Figure 2 is a side view of a trolley wire according to an embodiment of the present invention to which a feed ear, as an example of an ear fitting, is connected. [Figure 3]Fig. 3(a) is an external view of the trolley wire according to an embodiment of the present invention in a state wound around a drum. Fig. 3(b) shows a partial cross-section of the trolley wire wound horizontally around the body of the drum.

Embodiments for Carrying Out the Invention

[0011] (Structure of Trolley Wire) Fig. 1 is a radial cross-sectional view of a trolley wire 1 according to an embodiment of the present invention. The trolley wire 1 is an irregular round-shaped trolley wire and has an upper small arc surface 11, a lower large arc surface 12, and a V-shaped ear groove 13 for connecting ear fittings between the small arc surfaces 11 and the large arc surfaces 12 on both sides.

[0012] The shape of the trolley wire 1 corresponds to, for example, the shape of a grooved hard copper trolley wire defined in JIS E2101 or IEC 62917. The trolley wire 1 has a length corresponding to the distance of an overhead line section such as a Shinkansen line.

[0013] Further, the trolley wire 1 includes a linear wear detection groove 14 along the longitudinal direction of the trolley wire 1 provided at a position below the wear limit position 16 on one side surface of the trolley wire 1 (the surface on one side of the vertical center line 15). The wear detection groove 14 is located below the ear groove 13, that is, on the large arc surface 12.

[0014] The nominal cross-sectional area of the trolley wire 1 is, for example, 110 mm 2 (110 SQ) or more and 170 mm 2 (170 SQ) or less. The trolley wire 1 is mainly composed of a copper alloy, for example, a Cu-Sn-In-based alloy or a Cu-Sn-based alloy. The tensile strength of the trolley wire 1 is, for example, 360 MPa or more.

[0015] Note that the nominal cross-sectional area is the approximate radial cross-sectional area when there is no wear detection groove 14. For example, when there is no wear detection groove 14 in the trolley wire 1 with a nominal cross-sectional area of 110 mm 2 , the radial cross-sectional area is 108 mm 2 or more and 112 mm 2 or less, and when the nominal cross-sectional area is 170 mm 2When there is no wear detection groove 14 on the trolley wire 1, the radial cross-sectional area is 168 mm 2 or more and 172 mm 2 or less.

[0016] Also, for example, the height and width of the trolley wire 1 with a nominal cross-sectional area of 110 mm 2 are within the range of 12.34 mm ± 1%, and the height and width of the trolley wire 1 with a nominal cross-sectional area of 170 mm 2 are within the range of 15.30 mm ± 1%.

[0017] When power is supplied to a railway vehicle via the trolley wire 1, the bottom of the large arc surface 12 contacts a current collector of the railway vehicle such as a pantograph. Therefore, due to the sliding of the current collector, the trolley wire 1 wears from the bottom of the large arc surface 12. Generally, the limit up to which a worn trolley wire can maintain a strength that allows safe use is called the wear limit.

[0018] The wear limit position 16 is the position in the height direction (direction parallel to the center line 15) of the trolley wire 1 indicating the wear limit of the trolley wire 1 when wear without bias occurs where the wear surface becomes horizontal. If the wear without bias progresses beyond the wear limit position 16, the cross-sectional area falls below the area that can maintain a strength allowing safe use, increasing the risk of disconnection.

[0019] For example, when the nominal cross-sectional area of the trolley wire 1 is 110 mm 2 , the distance L0 in the height direction between the upper end of the trolley wire 1 and the wear limit position 16 of the trolley wire 1 is 6.5 mm, and when the nominal cross-sectional area of the trolley wire 1 is 170 mm 2 , the distance L0 is 8.5 mm.

[0020] The wear detection groove 14 is provided below the wear limit position 16 and at a position considering the uneven wear described later.

[0021] In the trolley wire 1, a wear detection groove 14 is provided on only one side. Therefore, as described later, variations in the tilt angle and twisting when the wire is wound horizontally on the drum are suppressed. In addition, by providing the wear detection groove 14 on only one side, the decrease in strength due to the decrease in volume of the trolley wire 1 can be suppressed.

[0022] An ear fitting is connected to the trolley wire 1 that is mounted on the overhead railway track. The ear fitting is a fitting that grips the ear groove 13 of the trolley wire 1 and is fixed onto the trolley wire 1. Examples of ear fittings include feed ears and connector fittings used to electrically connect the trolley wire and the suspension wire, hanger ears used to suspend the trolley wire to the suspension wire or auxiliary suspension wire, curve tension fittings used to hold the trolley wire in place according to curved tracks, anti-vibration fittings used to hold the trolley wire in place in straight sections, trolley wire connecting fittings such as double ears, triple ears, and splicers used to connect trolley wires to each other, and anchor ears to prevent the trolley wire from moving.

[0023] Figure 2 is a side view of a trolley wire 1 to which a feed ear 2, an example of an ear fitting, is connected. By tightening the nut 21, the gap between the claws 22 that grip the ear groove 13 of the trolley wire 1 from both sides narrows, and the feed ear 2 is fixed to the trolley wire 1 while gripping the ear groove 13.

[0024] As shown in Figure 2, the overhead trolley wire 1 is marked by applying paint to the portion of the wear detection groove 14 located below the ear fittings such as the feed ear 2. This marked portion (referred to as the marking portion) 17 is formed by applying paint to the inner surface of the wear detection groove 14 along its length using a marking writing instrument such as a felt-tip pen.

[0025] The length of the marking portion 17 may be longer or shorter than the width of the portion of the ear fitting fixed to the trolley wire 1 (in the example shown in Figure 2, the width of the claw portion 22 of the feed ear 2), but the marking portion 17 is formed in at least a portion of the area directly below the ear fitting, such as the feed ear 2.

[0026] The marking portion 17 can be used as a marker to indicate the position of the ear fitting connected to the trolley wire 1. Furthermore, by providing the marking portion 17, the visibility of the wear detection groove 14 near the ear fitting, where wear of the trolley wire 1 progresses rapidly, can be improved. For the purpose of improving the visibility of the wear detection groove 14, it is preferable that the marking portion 17 is formed only on the inner surface of the wear detection groove 14, without protruding outside the wear detection groove 14.

[0027] As mentioned above, the marking portion 17 can be used as a marker to indicate the position of the ear fittings on the trolley wire 1. In addition to the marking portion 17, markings may also be made on the surface of the trolley wire 1 other than the inner surface of the wear detection groove 14 to indicate the position of the ear fittings.

[0028] The distance L1 between the upper and lower ends of the wear detection groove 14 in the height direction (parallel to the center line 15 in the radial cross-section) is 1.5 mm or more. By having a width such that L1 is 1.5 mm or more, it becomes easy to form a marking portion 17 on the inner surface of the wear detection groove 14 using a felt-tip pen or the like, without the marking extending outwards.

[0029] Furthermore, a larger L1 increases the width of the marking portion 17, improving the visibility of the marking portion 17. A larger L1 also allows for better handling of uneven wear (inclined wear). In other words, by checking for uneven wear when the wear reaches the wear detection groove 14, even if uneven wear is present, replacement can be performed before exceeding the wear limit.

[0030] Furthermore, L1 can be set according to the length of the preparation period for replacing the trolley wire 1. For example, if uneven wear occurs, progressing rapidly on the opposite side of the wear detection groove 14 (the right side in Figure 1), and preparation for replacement is to begin when it is confirmed that the uneven wear has reached the wear detection groove 14, and to perform the replacement when the disappearance of the wear detection groove 14 is confirmed or when it is about to disappear, then a larger L1 allows for a longer preparation period for replacing the trolley wire 1. The upper limit of L1 is set to 2.0 mm, according to the upper limit of the preparation period for replacing the trolley wire 1 that is normally required.

[0031] In other words, the height distance L1 between the upper and lower ends of the wear detection groove 14 is 1.5 mm or more and 2.0 mm or less.

[0032] The depth D of the wear detection groove 14 is preferably 0.20 mm or more and 0.30 mm or less. By setting the depth D to 0.20 mm or more, the visibility of the wear detection groove 14 and the marking portion 17 formed within the wear detection groove 14 can be improved. Furthermore, in order to suppress the decrease in strength due to the decrease in volume of the trolley wire 1, the depth D is preferably 0.30 mm or less.

[0033] The straight line 18 shown in Figure 1 indicates the position of the worn surface when it reaches the upper end of the wear detection groove 14, in the case of rapid uneven wear occurring on the opposite side of the wear detection groove 14 (the right side of Figure 1). The angle θ of the straight line 18 from the horizontal plane indicates the angle of the worn surface of the uneven wear from the horizontal plane (uneven wear angle).

[0034] The height distance L2 between the upper end of the trolley wire 1 and the upper end of the wear detection groove 14 is set such that the remaining cross-sectional area when the uneven wear reaches the upper end of the wear detection groove 14, that is, the area of ​​the upper part of the straight line 18 in the radial cross-section of the trolley wire 1, is equal to or greater than the cross-sectional area (required cross-sectional area) that can withstand the required load of the trolley wire 1.

[0035] For example, if the nominal cross-sectional area of ​​trolley wire 1 is 110 mm² 2In this case, assuming a overhead wire tension of 1 ton (9.8 kN), a safety factor of 2.2, and a tension fluctuation of 1.1, the required load is calculated to be 9.8 × 2.2 × 1.1 = 23.8 kN. Furthermore, assuming a trolley wire breaking strength of 440 MPa, the required cross-sectional area of ​​trolley wire 1 is 23800 / 440 = 54.1 mm². 2 This is the result.

[0036] Assuming normal wear occurs where the wear surface is horizontal, rather than uneven wear, if the distance L2 is 6.5 mm, then when the wear reaches the upper end of the wear detection groove 14, it will be 54.1 mm. 2 The required cross-sectional area can be secured. However, if the distance L2 is 6.5 mm, and uneven wear occurs that progresses rapidly on the opposite side of the wear detection groove 14, there is a risk that the pantograph will come into contact with the ear fitting when the uneven wear reaches the upper end of the wear detection groove 14, and the remaining cross-sectional area is 54.1 mm². 2 This will result in a cross-sectional area that falls below the required area.

[0037] Therefore, the nominal cross-sectional area of ​​trolley wire 1 is 110 mm². 2 In this case, by making the distance L2 greater than the distance L0, which is 7.5 mm or more, it is possible to prevent the pantograph from contacting the ear fitting when uneven wear reaches the upper end of the wear detection groove 14, and 54.1 mm 2 It is possible to secure a remaining cross-sectional area greater than the required cross-sectional area.

[0038] For example, if the distance L2 is 7.5 mm, and uneven wear occurs with an uneven wear angle θ of 6.23°, the remaining cross-sectional area when the uneven wear reaches the upper end of the wear detection groove 14, i.e., the cross-sectional area on the upper side of the straight line 18, is 54.1 mm², which is the required cross-sectional area. 2 The above is 59.5 mm. 2 This is the result. Also, if the distance L2 is 7.5 mm, even when uneven wear occurs with an uneven wear angle θ of 8.37°, the remaining cross-sectional area on the upper side of the straight line 18 is 54.1 mm, which is the required cross-sectional area. 2 The above is 56.7 mm. 2This is the result. Here, 8.37° is the maximum value of the uneven wear angle θ that is actually expected to occur. Note that when the distance L2 is 7.5 mm, the remaining cross-sectional area when normal wear reaches the upper end of the wear detection groove 14 is 67.5 mm, which is approximately 1.25 times the required cross-sectional area. 2 This is the result.

[0039] (Management of wear on trolley wires) The wear condition of the overhead trolley wire 1 is inspected, for example, by observing the appearance of the trolley wire 1 using binoculars from a specific location on the ground. In this inspection of the wear condition of the trolley wire 1, it is important to observe the wear condition of the parts to which ear fittings such as feed ears 2, which wear rapidly, are connected.

[0040] The observer can easily locate the part of the trolley wire 1 to which the ear fitting is connected by using the marked portion 17 as a guide. Furthermore, the marking portion 17 improves the visibility of the wear detection groove 14 at the part to which the ear fitting is connected, allowing for a more accurate determination of the wear state. Specifically, for example, the wear state can be determined by checking the distance between the worn surface at the bottom of the trolley wire 1 and the marked portion 17, i.e., the remaining length of the trolley wire 1 up to the marked portion 17, or by checking the remaining length of the marked portion 17 after the wear has reached the marked portion 17.

[0041] Since the wear condition of the trolley wire 1 is usually inspected at night using lighting, it is preferable that the marking portion 17 has a color that is highly visible when illuminated in a dark place, such as white.

[0042] According to an embodiment of the present invention, a method for managing the wear of a trolley wire 1 to which an ear fitting such as a feed ear 2 is connected can be provided. This method for managing the wear of the trolley wire 1 includes the steps of: marking a portion of a wear detection groove 14, which is provided below a wear limit position 16 on one side of the trolley wire 1, by applying paint to the portion located below the ear fitting; and inspecting the wear state of the trolley wire 1 by observing the appearance of the vicinity of the marked portion 17.

[0043] (Manufacturing of trolley wires) The trolley wire 1 is manufactured by drawing a rough-drawn copper alloy wire using a wire drawing machine. The rough-drawn wire passes through a series of dies equipped in the wire drawing machine, which narrows its outer shape and forms an ear groove 13 and a wear detection groove 14. The manufactured trolley wire 1 is wound onto a drum 3 by a drum winding machine and stored inside.

[0044] Figure 3(a) is an external view of the trolley wire 1 wound on the drum 3. The drum 3 has a cylindrical body 30 around which the trolley wire 1 is wound, and two disc-shaped flange plates 31 provided on both sides of the body 30.

[0045] Figure 3(b) shows a cross-section of a portion of the trolley wire 1 wound horizontally around the drum 30. The cross-section shown in Figure 3(b) is a portion of the first layer (the part in contact with the surface of the drum 30) of the multi-layered trolley wire 1.

[0046] Here, "horizontal winding" refers to a winding method in which the center line 15 of the trolley wire 1 is parallel to or nearly parallel to the surface of the drum 30 (for example, the angle between the center line 15 and the surface of the drum 30 is 15° or less). Generally, when winding the trolley wire onto the drum, horizontal winding can suppress the occurrence of wavy wear caused by the trolley wire undulating up and down after being mounted overhead.

[0047] However, when trolley wire with wear-detecting grooves on both sides is wound horizontally onto a drum, the unevenness on the sides of the trolley wire caused by the wear-detecting grooves comes into contact with the surface of the drum body, leading to a problem of variations in the angle of inclination and twisting. When variations in the angle of inclination and twisting occur in the trolley wire wound on the drum, different winding habits are created in different sections. As a result, the shape of the trolley wire after it is installed becomes irregular, causing problems such as wavy wear.

[0048] On the other hand, the trolley wire 1 according to the embodiment of the present invention has a wear detection groove 14 on only one side. Therefore, as shown in Figure 3(b), if the trolley wire 1 is wound around the drum 3 so that the side without the wear detection groove 14 is in contact with the surface of the body 30, the occurrence of tilting and twisting can be suppressed.

[0049] (Effects of the embodiment) The trolley wire 1 according to an embodiment of the present invention is equipped with a highly visible wear detection groove 14 suitable for forming a marking portion 17. Furthermore, when winding the trolley wire 1 horizontally onto the drum 3, the side without the wear detection groove 14 is brought into contact with the surface of the body 30, thereby suppressing variations in the inclination angle and twisting.

[0050] Furthermore, according to the wear management method for the trolley wire 1 in the embodiment of the present invention, by forming a marking portion 17 in the wear detection groove 14 of the trolley wire 1, the wear condition of the portion to which the ear fitting, which wears rapidly, is connected can be accurately inspected.

[0051] (Summary of the embodiments) Next, the technical concept understood from the embodiments described above will be described using the reference numerals and other symbols from the embodiments. However, the reference numerals and other symbols in the following description are not limited to the components in the claims that are specifically shown in the embodiments.

[0052] [1] A trolley wire (1) having a linear wear detection groove (14) along the longitudinal direction provided below the wear limit position (16) on one side, wherein the height distance (L1) between the upper and lower ends of the wear detection groove (14) is 1.5 mm or more and 2.0 mm or less.

[0053] [2] The trolley wire (1) described in [1] above, wherein the depth (D) of the wear detection groove (14) is 0.20 mm or more and 0.30 mm or less.

[0054] [3] Nominal cross-sectional area of ​​110 mm 2The trolley wire (1) as described in [1] or [2] above, wherein the distance (L2) in the height direction between its upper end and the upper end of the wear detection groove (14) is 7.5 mm or more.

[0055] [4] A method for managing wear of a trolley wire (1) to which an ear fitting (2) is connected, comprising the steps of: marking a portion of a wear detection groove (14) provided below a wear limit position (16) on one side of the trolley wire (1) by applying paint to the portion located below the ear fitting (2); and inspecting the wear state of the trolley wire (1) by observing the appearance of the vicinity of the marked portion (17).

[0056] [5] The method for managing wear of the trolley wire (1) as described in [4] above, wherein the distance (L1) in the height direction between the upper end and the lower end of the wear detection groove (14) is 1.5 mm or more and 2.0 mm or less.

[0057] [6] The wear control method for the trolley wire (1) according to [4] or [5] above, wherein the depth (D) of the wear detection groove (14) is 0.20 mm or more and 0.30 mm or less.

[0058] [7] The nominal cross-sectional area of ​​the trolley wire (1) is 110 mm 2 The method for managing wear of a trolley wire (1) according to [4] or [5] above, wherein the distance (L2) in the height direction between the upper end of the trolley wire (1) and the upper end of the wear detection groove (14) is 7.5 mm or more.

[0059] Although embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the invention.

[0060] Furthermore, the embodiments described above do not limit the invention as defined in the claims. It should also be noted that not all combinations of features described in the embodiments are necessarily essential for solving the problem of the invention. [Explanation of Symbols]

[0061] 1. Trolley wire 14 grooves for wear detection 16 Wear limit position 17 Marking area 2 feed years

Claims

1. It is equipped with a linear wear detection groove along the longitudinal direction, located below the wear limit position on one side, The height distance between the upper and lower ends of the wear detection groove is 1.5 mm or more and 2.0 mm or less. Trolley wire.

2. The depth of the wear detection groove is 0.20 mm or more and 0.30 mm or less. The trolley wire according to claim 1.

3. Nominal cross-sectional area is 110 mm² ２ And, The height distance between its upper end and the upper end of the wear detection groove is 7.5 mm or more. The trolley wire according to claim 1 or 2.

4. A method for managing wear on a trolley wire to which an ear fitting is connected, A step of marking the portion of a wear detection groove located below the ear fitting on one side of the trolley wire by applying paint, A step of inspecting the wear condition of the trolley wire by observing the appearance of the vicinity of the marked portion, A method for managing wear on trolley wires, including the wear control method for trolley wires.

5. The height distance between the upper and lower ends of the wear detection groove is 1.5 mm or more and 2.0 mm or less. The method for managing wear on a trolley wire according to claim 4.

6. The depth of the wear detection groove is 0.20 mm or more and 0.30 mm or less. A method for managing wear on a trolley wire according to claim 4 or 5.

7. The nominal cross-sectional area of ​​the trolley wire is 110 mm². ２ And, The height distance between the upper end of the trolley wire and the upper end of the wear detection groove is 7.5 mm or more. A method for managing wear on a trolley wire according to claim 4 or 5.

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