Trolley wire, method for manufacturing trolley wire, and method for quality control of trolley wire

Abstract

This invention provides a trolley wire that improves the visibility of wear detection grooves and allows for easy visual detection of twisting when the trolley wire is wound horizontally around a drum, a method for manufacturing the trolley wire, and a method for quality control of the trolley wire using the trolley wire. [Solution] A trolley wire 1 is provided, having a linear first wear detection groove 14 along the length direction formed below the wear limit position 18 on both sides of the wire, and a linear fluorescent paint coating 16 formed on the inner surface of the first wear detection groove 14.

Description

[Technical Field]

[0001] The present invention relates to a trolley wire for supplying power to a railway vehicle, a method for manufacturing a trolley wire, and a method for quality control of a trolley wire. [Background technology]

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

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

[0004] However, trolley wires with wear-detection grooves have a problem: when wound horizontally around a drum, the wear-detection grooves on the sides come into contact with the surface of the drum body, making them prone to twisting. Furthermore, it is difficult to detect such twisting of the trolley wire, making it difficult to address. Additionally, if the width or depth of the wear-detection grooves is reduced to avoid such twisting, the visibility of the wear-detection grooves on the trolley wire when it is installed decreases, making wear inspection difficult.

[0005] The object of the present invention is to provide a trolley wire that improves the visibility of wear detection grooves and allows for easy visual detection of twisting when the trolley wire is wound horizontally around a drum, a method for manufacturing the trolley wire, and a method for quality control of the trolley wire using the trolley wire. [Means for solving the problem]

[0006] The present invention aims to solve the above problems by providing a trolley wire having a linear first wear detection groove along the length direction, formed below the wear limit position on both sides of the wire, and having a linear fluorescent coating film formed on the inner surface of the first wear detection groove.

[0007] Furthermore, the present invention provides a method for manufacturing a trolley wire, which includes a groove forming step of forming a linear first wear detection groove along the length of the trolley wire below the wear limit position on both sides of the trolley wire, and a coating film forming step of applying a fluorescent paint to the inner surface of the first wear detection groove to form a coating film.

[0008] Furthermore, the present invention aims to solve the above problems by providing a method for quality control of a trolley wire, which includes a winding step of winding the trolley wire onto a drum in a horizontal winding manner, and in the winding step, the coating film of the wound trolley wire is observed to determine whether or not the trolley wire is twisted. [Effects of the Invention]

[0009] According to the present invention, it is possible to provide a trolley wire that improves the visibility of wear detection grooves and allows for easy visual detection of twisting when the trolley wire is wound horizontally around a drum, a method for manufacturing the trolley wire, and a method for quality control 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 magnified view of the area around the wear detection groove for the trolley wire shown in Figure 1. [Figure 3] Figures 3(a) to 3(c) are side views of a trolley wire, illustrating an example of a change in condition due to wear. [Figure 4]Figure 4(a) is an external view of the trolley wire according to an embodiment of the present invention in a state wound on a drum. Figure 4(b) shows a cross-section of a portion of the trolley wire wound horizontally around the drum body. [Modes for carrying out the invention]

[0011] (Structure of the trolley wire) Figure 1 is a radial cross-sectional view of a trolley wire 1 according to an embodiment of the present invention. Figure 2 is an enlarged view of the area around the first wear detection groove 14 of the trolley wire 1 in Figure 1. The trolley wire 1 is an irregularly shaped round trolley wire and has a small arc surface 11 at the top, a large arc surface 12 at the bottom, and V-shaped ear grooves 13 between the small arc surface 11 and the large arc surface 12 on both sides for connecting ear fittings.

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

[0013] Furthermore, the trolley wire 1 has linear first wear detection grooves 14 formed along its length at positions below the wear limit position 18 on both sides of the trolley wire 1 (the surfaces on both sides of the vertical centerline 17). The first wear detection grooves 14 are located below the ear groove 13, i.e., on the large arc surface 12.

[0014] A linear fluorescent coating 16 is formed on the inner surface of the first wear detection groove 14. The formation of the coating 16 improves the visibility of the first wear detection groove 14.

[0015] Since the visibility of the first wear detection groove 14 is improved by the coating film 16, even when the width W1 and depth D1 of the first wear detection groove 14 are reduced to suppress the torsion of the trolley wire 1 when it is wound around the drum in a horizontal winding manner, sufficient visibility can be ensured in the inspection of the wear state of the strung trolley wire 1. Further, by forming the coating film 16, when torsion occurs when the trolley wire 1 is wound around the drum in a horizontal winding manner, it becomes easier to visually recognize this. This effect will be described later.

[0016] Note that the coating film 16 may be formed so as to protrude outside the inner surface of the first wear detection groove 14 as long as the effect of the coating film 16 can be obtained, not only on the inner surface of the first wear detection groove 14 (for example, when the width of the roller for applying the fluorescent paint is larger than the width W1 of the first wear detection groove 14). Also, the coating film 16 does not need to cover the entire inner surface of the first wear detection groove 14, and the width of the coating film 16 may be smaller than the width of the inner surface of the first wear detection groove 14 as long as the effect of the coating film 16 can be obtained (for example, when the width of the roller for applying the fluorescent paint is smaller than the width W1 of the first wear detection groove 14).

[0017] The coating film 16 is formed by linearly applying a fluorescent paint along the first wear detection groove 14. Therefore, it can be formed more easily compared to the case of forming a coating film by linearly applying a fluorescent paint on a flat surface without a groove. Also, since the coating film 16 is formed on the inner surface of the first wear detection groove 14, it has the characteristic of being difficult to peel off compared to a coating film formed on a flat surface without a groove.

[0018] The inspection of the wear state of the strung trolley wire 1 is performed, for example, at night by observing the appearance while illuminating the trolley wire 1. At this time, since fluorescence is emitted from the coating film 16 irradiated with the illumination light, the visibility of the first wear detection groove 14 is significantly higher compared to the case where the coating film 16 is not formed.

[0019] Examples of the fluorescent paint for forming the coating film 16 include alkyd resin-based and acrylic resin-based. Known fluorescent paints such as acrylic urethane resin-based and acrylic silicone resin-based paints can be used.

[0020] 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.

[0021] Note that the nominal cross-sectional area is approximately the cross-sectional area in the radial direction when there is no first wear detection groove 14 or the second wear detection groove 15 described later. For example, when there is no first wear detection groove 14 or the second wear detection groove 15 in the trolley wire 1 with a nominal cross-sectional area of 110 mm 2 the cross-sectional area in the radial direction is 108 mm 2 or more and 112 mm 2 or less, and when there is no first wear detection groove 14 or the second wear detection groove 15 in the trolley wire 1 with a nominal cross-sectional area of 170 mm 2 the cross-sectional area in the radial direction is 168 mm 2 or more and 172 mm 2 or less.

[0022] 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%.

[0023] 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.

[0024] The wear limit position 18 indicates the position of the worn surface when the cross-sectional area of ​​the trolley wire 1 decreases to the minimum cross-sectional area (design limit value) that can maintain sufficient strength for safe use due to wear. If the wear on the trolley wire 1 exceeds the wear limit position 18, the risk of the trolley wire 1 breaking increases. In Figure 1, the wear limit position 18 is the position of the trolley wire 1 in the height direction (parallel to the center line 17) when uneven wear occurs with the worn surface being horizontal.

[0025] For example, if the nominal cross-sectional area of ​​trolley wire 1 is 110 mm² 2 In this case, the distance in the height direction of the trolley wire 1 between the wear limit position 18 and the upper end of the trolley wire 1 is 7.5 mm, and the nominal cross-sectional area of ​​the trolley wire 1 is 170 mm². 2 In this case, the distance between the wear limit position 18 and the upper end of the trolley wire 1 in the height direction is 8.5 mm.

[0026] The first wear detection groove 14 is formed at a position close to the wear limit position 18, which is below the wear limit position 18. Therefore, when wear reaches the first wear detection groove 14, it is possible to know that the wear has reached or is about to reach the wear limit position 18.

[0027] As shown in Figures 1 and 2, the trolley wire 1 may have a linear second wear detection groove 15 along the length of the trolley wire 1, below the first wear detection groove 14 on both sides of the trolley wire 1.

[0028] The second wear detection groove 15 can be used to predict when the trolley wire 1 needs to be replaced. For example, preparation for replacement can begin when it is confirmed that wear has reached the second wear detection groove 15, and replacement can be carried out when it is confirmed that wear has reached the first wear detection groove 14. In this case, the distance L between the first wear detection groove 14 and the second wear detection groove 15 on both sides of the trolley wire 1 can be set according to the length of the preparation period for replacing the trolley wire 1.

[0029] Figures 3(a) to 3(c) are side views of the trolley wire 1, showing an example of a change in state due to wear. Figure 3(a) shows a state where no wear has occurred, Figure 3(b) shows a state where even wear has reached the second wear detection groove 15, and Figure 3(c) shows a state where even wear has reached the first wear detection groove 14.

[0030] Furthermore, the second wear detection groove 15 can also be used to address uneven wear (inclined wear). That is, by checking whether uneven wear is occurring when the wear reaches the second wear detection groove 15, even if uneven wear is occurring, replacement can be carried out before the wear limit is exceeded.

[0031] When forming a second wear detection groove 15, it is preferable that the coating 16 be formed only on the inner surface of the first wear detection groove 14. This is because having two coatings 16 increases the difficulty of manufacturing, and the effects of forming the above-mentioned coating 16 can be sufficiently obtained with just one coating 16.

[0032] However, if the widths of the first wear detection groove 14 and the second wear detection groove 15 are small (for example, the width W1 of the first wear detection groove 14 and the width W2 of the second wear detection groove 15 are 1 mm or less) and they are close together (for example, the distance L between the first wear detection groove 14 and the second wear detection groove 15 on both sides of the trolley wire 1 is 0.5 mm or less), then the inner surfaces of the first wear detection groove 14 and the inner surfaces of the second wear detection groove 15 may be covered with a single coating 16.

[0033] In this case, by simultaneously applying fluorescent paint to the inner surface of the first wear detection groove 14, the inner surface of the second wear detection groove 15, and the area between the first wear detection groove 14 and the second wear detection groove 15 on both sides of the trolley wire 1, a coating film 16 is obtained that is continuously formed on the inner surface of the first wear detection groove 14, the inner surface of the second wear detection groove 15, and the area between the first wear detection groove 14 and the second wear detection groove 15.

[0034] When inspecting the wear condition of the trolley wire 1, it is preferable that the distance L between them be 0.8 mm or more, in order to make it easier to visually identify that the first wear detection groove 14 and the second wear detection groove 15 are two grooves formed separately.

[0035] In order to suppress twisting of the trolley wire 1 when it is wound horizontally around the drum, it is preferable that the width W1 of the first wear detection groove 14 and the width W2 of the second wear detection groove 15 are 1.5 mm or less, and that the depth D1 of the first wear detection groove 14 and the depth D2 of the second wear detection groove 15 are 0.35 mm or less.

[0036] (Manufacturing of trolley wires) The following describes an example of the manufacturing process for the trolley wire 1. The shape of the trolley wire 1 is formed by drawing and grooving a rough-drawn wire made of copper alloy using a wire drawing machine. The rough-drawn wire is narrowed in shape as it passes sequentially through a plurality of dies provided in the wire drawing machine, and an ear groove 13, a first wear detection groove 14, and a second wear detection groove 15 are formed. Typically, a wire drawing machine uses a die for wire drawing and a die for grooving to form the ear groove 13, the first wear detection groove 14, and the second wear detection groove 15.

[0037] In the wire drawing process, a lubricating oil is applied in advance to the surface of the rough-drawn wire that comes into contact with the die to prevent seizing. After the wire drawing process, the surface of the trolley wire 1 is cleaned with alcohol to remove any remaining lubricating oil.

[0038] After cleaning with alcohol, fluorescent paint is applied to the inner surface of the linear first wear detection groove 14 using a roller or the like to form a coating film 16. At this time, it is preferable to apply the fluorescent paint only to the inner surface of the first wear detection groove 14, of the inner surface of the first wear detection groove 14 and the inner surface of the second wear detection groove 15, to form the coating film 16. However, as described above, if the width of the first wear detection groove 14 and the second wear detection groove 15 is small and they are close together, fluorescent paint may be applied simultaneously to the inner surface of the first wear detection groove 14, the inner surface of the second wear detection groove 15, and the area between the first wear detection groove 14 and the second wear detection groove 15 on both sides of the trolley wire 1 to form a single continuous coating 16. After the coating 16 is formed, the trolley wire 1 is wound onto the drum 2 by a drum winding machine and stored.

[0039] Figure 4(a) is an external view of the trolley wire 1 wound on the drum 2. The drum 2 has a cylindrical body 20 around which the trolley wire 1 is wound, and two disc-shaped flange plates 21 provided on both sides of the body 20.

[0040] Figure 4(b) shows a cross-section of a portion of the trolley wire 1 wound horizontally around the drum body 20. The cross-section shown in Figure 4(b) is a portion of the first layer (the part in contact with the surface of the drum body 20) of the multi-layered trolley wire 1.

[0041] Here, "horizontal winding" refers to a winding method in which the center line 17 of the trolley wire 1 is parallel to or nearly parallel to the surface of the drum 20 (for example, the angle between the center line 17 and the surface of the drum 20 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.

[0042] However, when the trolley wire 1, which has a first wear detection groove 14 and a second wear detection groove 15 formed on both sides, is wound horizontally onto the drum 2, the portions of the first wear detection groove 14 and the second wear detection groove 15 may come into contact with the surface of the drum body 20, causing twisting. When twisting occurs in the trolley wire 1 wound on the drum 2, different winding kinks are created in different sections. As a result, the shape of the trolley wire 1 after overhead line installation becomes irregular, leading to problems such as wavy wear.

[0043] In the trolley wire 1 according to an embodiment of the present invention, a coating 16 is continuously formed along the longitudinal direction of the trolley wire 1 on the inner surface of the first wear detection groove 14. Therefore, as shown in Figure 4(b), the coating 16 on one side of the trolley wire 1, which is wound horizontally, faces upward and can be easily seen.

[0044] If there is no twisting in the trolley wire 1 that is wound horizontally, multiple linear coating films 16 will appear to be aligned in parallel. Therefore, if there is a part where multiple linear coating films 16 are not aligned in parallel, it can be determined that twisting has occurred in that part, and corrective measures such as rewinding can be taken.

[0045] In other words, according to an embodiment of the present invention, a method for quality control of a trolley wire 1 is provided, which includes a winding step of winding the trolley wire 1 onto a drum 2 in a horizontal winding manner, and in the winding step, the coating film 16 of the wound trolley wire 1 is observed to determine whether or not the trolley wire 1 is twisted.

[0046] When the trolley wire 1 is wound horizontally around the drum 2, the first wear detection groove 14 usually faces more directly upwards than the second wear detection groove 15. For this reason, forming the coating 16 on the inner surface of the first wear detection groove 14 makes the coating 16 easier to see and makes it easier to judge the twisting of the trolley wire 1, rather than forming the coating 16 on the inner surface of the second wear detection groove 15.

[0047] (Effects of the embodiment) The trolley wire 1 according to an embodiment of the present invention has a coating 16 that can improve the visibility of the first wear detection groove 14. Therefore, even if the width W1 and depth D1 of the first wear detection groove 14 are reduced in order to suppress twisting of the trolley wire 1 when it is wound horizontally around the drum 2, sufficient visibility of the first wear detection groove 14 can be ensured when inspecting the wear condition of the suspended trolley wire 1. In addition, the presence of the coating 16 makes it easier to see if twisting occurs when the trolley wire 1 is wound horizontally around the drum 2.

[0048] (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.

[0049] [1] A trolley wire (1) having linear first wear detection grooves (14) along the length direction formed below the wear limit position (18) on both sides, and a linear fluorescent paint coating (16) formed on the inner surface of the first wear detection grooves (14).

[0050] [2] The trolley wire (1) according to [1], wherein a linear second wear detection groove (15) is located below the first wear detection groove (14) on both sides of the trolley wire (1) and is aligned in the longitudinal direction.

[0051] [3] The coating (16) is formed only on the inner surface of the first wear detection groove (14) of the inner surface of the first wear detection groove (14) and the inner surface of the second wear detection groove (15), as described in [2] above.

[0052] [4] A method for manufacturing a trolley wire (1), comprising: a groove forming step of forming linear first wear detection grooves (14) along the length direction of the trolley wire (1) below the wear limit position (18) on both sides of the trolley wire (1); and a coating film forming step of applying fluorescent paint to the inner surface of the first wear detection grooves (14) to form a coating film.

[0053] [5] The method for manufacturing the trolley wire (1) according to [4], wherein in the groove forming step, the first wear detection groove (14) and a linear second wear detection groove (15) below it, which is aligned along the longitudinal direction, are formed on the sides of both sides.

[0054] [6] The method for manufacturing a trolley wire according to [5] above, wherein in the coating film forming step, the fluorescent paint is applied only to the inner surface of the first wear detection groove (14) of the inner surface of the second wear detection groove (15) to form a coating film.

[0055] [7] A method for quality control of a trolley wire (1), comprising a winding step of winding the trolley wire (1) described in any one of the above items [1] to [3] onto a drum (2) in a horizontal winding manner, wherein in the winding step, the coating film (16) of the wound trolley wire (1) is observed to determine whether or not the trolley wire (1) is twisted.

[0056] 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.

[0057] 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]

[0058] 1. Trolley wire 14 grooves for wear detection 15. Second wear detection groove 16. Coating film 18 Wear limit location

Claims

1. It has a linear first wear detection groove that runs along the length and is formed below the wear limit position on both sides of the surface, A linear fluorescent coating film is formed on the inner surface of the first wear detection groove. Trolley wire.

2. Below the first wear detection groove on both sides of the aforementioned side surface, there is a linear second wear detection groove that runs along the longitudinal direction. The trolley wire according to claim 1.

3. The coating is formed only on the inner surface of the first wear detection groove, of the inner surface of the first wear detection groove and the inner surface of the second wear detection groove. The trolley wire according to claim 2.

4. A groove forming step in which a linear first wear detection groove is formed along the length of the trolley wire below the wear limit position on both sides of the trolley wire, A coating film forming step involves applying fluorescent paint to the inner surface of the first wear detection groove to form a coating film, including, A method for manufacturing trolley wires.

5. In the groove forming step, the first wear detection groove and a second linear wear detection groove below it, along the longitudinal direction, are formed on the two side surfaces. The method for manufacturing a trolley wire according to claim 4.

6. In the coating film formation step, the fluorescent paint is applied only to the inner surface of the first wear detection groove, of the inner surface of the first wear detection groove and the inner surface of the second wear detection groove, to form the coating film. The method for manufacturing a trolley wire according to claim 5.

7. The process includes winding the trolley wire described in any one of claims 1 to 3 onto a drum in a horizontal winding manner, A method for controlling the quality of a trolley wire, comprising observing the coating on the wound trolley wire during the winding process to determine whether or not the trolley wire is twisted.

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