Trolley wire
By designing three vertically arranged grooves on the tram line and using the depth and position of the third groove to improve visibility, the problem of high wear detection cost in the prior art is solved, and a more efficient and economical wear detection effect is achieved.
Patent Information
- Application Number
- JP2023155561
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-09-21
- Publication Date
- 2025-04-03
AI Technical Summary
In the prior art, the wear condition of the tram line side groove is determined by visual observation or camera, resulting in high wear detection costs and long time.
A tram line was designed that consisted of three vertically arranged grooves: the first groove below the wear limit position, the second groove below the first groove, the third groove had a depth exceeding the first two grooves, and was detected by ground observation before the third groove disappeared.
Through the depth design and position optimization of the third groove, the visibility of wear detection is improved, the dependence on dedicated detection vehicle cameras is reduced, and the time, labor and cost of wear detection is reduced.
Smart Images
Figure 2025047207000001_ABST
Abstract
Description
[Technical field]
[0001] The present invention relates to a contact wire used in an electric rail track. [Background technology]
[0002] Conventionally, a trolley wire is known in which a plurality of linear grooves are provided on both sides along the longitudinal direction (see Patent Document 1). According to the trolley wire described in Patent Document 1, in addition to the groove provided at a position close to the wear limit position, another groove is provided at a position below the uneven wear limit position, so that wear management can be performed even if uneven wear occurs in the trolley wire. [Prior art documents] [Patent documents]
[0003] [Patent Document 1] Patent Publication No. 2021-59248 Summary of the Invention [Problem to be solved by the invention]
[0004] According to Patent Document 1, in controlling wear of a contact wire, whether or not the above-mentioned groove has disappeared due to wear is observed visually or by a camera or the like to determine the wear state.
[0005] However, in trolley wires having grooves on the sides for wear management, such as the trolley wire described in Patent Document 1, the grooves are difficult to see from the ground when the trolley wire is suspended, so in practice it is often necessary to observe using a camera on a dedicated inspection vehicle from the early stages of wear inspection, which may result in high costs in terms of time, effort, and money spent on wear inspection.
[0006] Therefore, an object of the present invention is to provide a trolley wire having a groove for wear management on the side, which can reduce the cost spent on wear inspection. [Means for solving the problem]
[0007] In order to solve the above-mentioned problems, the present invention provides a trolley wire comprising a first linear groove along the longitudinal direction provided at a position below the wear limit position on both sides, a second linear groove along the longitudinal direction provided below the first groove on both sides, and a third linear groove along the longitudinal direction provided below the second groove on both sides, wherein the third groove is deeper than the first groove and the second groove. Effect of the Invention
[0008] According to the present invention, a trolley wire having a groove for wear management on the side can be provided, which can reduce the cost of wear inspection. [Brief description 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. [Diagram 2] FIG. 2 is a radial cross-sectional view of a contact wire according to an embodiment of the present invention. [Diagram 3] FIG. 3 is a partially enlarged view of a radial cross section of a contact wire according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0010] (Contact Wire Structure) 1 and 2 are cross-sectional views in the radial direction of a trolley wire 1 according to an embodiment of the present invention. 2 FIG. 2 shows the cross section of the contact wire 1 when the nominal cross-sectional area is 170 mm 2 The cross section for (170SQ) is shown.
[0011] The trolley wire 1 includes first grooves 14 arranged linearly along the longitudinal direction of the trolley wire 1 at positions below the wear limit positions on both side surfaces (on both sides of a vertical centerline 20) of the trolley wire 1, second grooves 15 arranged linearly along the longitudinal direction of the trolley wire 1 below the first grooves 14 on both side surfaces of the trolley wire 1, and third grooves 16 arranged linearly along the longitudinal direction of the trolley wire 1 below the second grooves 15 on both side surfaces of the trolley wire 1. The third grooves 16 are deeper than the first grooves 14 and the second grooves 15.
[0012] The trolley wire 1 is a grooved hard copper trolley wire as specified in JRS (former Japanese National Railways standard), JISE2101, and IEC62917, and has a small arc surface 11 at the top, a large arc surface 12 at the bottom, and a V-shaped ear groove 13 between the small arc surfaces 11 and the large arc surfaces 12 on both sides.
[0013] The trolley wire 1 is mainly composed of pure copper or a copper alloy such as a Cu-Sn-In alloy or a Cu-Sn alloy. The nominal cross-sectional area of the trolley wire 1 is 110 mm 2 (110SQ) or more and 170mm 2 (170SQ) or less. The tensile strength of the trolley wire 1 is, for example, 360 MPa or more. 2 The height and width of the contact wire 1 are within the range of 12.34 mm ± 1%, and the nominal cross-sectional area is 170 mm 2 The height and width of the contact wire 1 are within the range of 15.30 mm ± 1%.
[0014] The nominal cross-sectional area is an approximate cross-sectional area in the radial direction when the first groove 14, the second groove 15, and the third groove 16 are not present. For example, when the nominal cross-sectional area is 110 mm 2 If the first groove 14, the second groove 15, and the third groove 16 of the contact wire 1 are not provided, the radial cross-sectional area is 108 mm 2 Above, 112mm 2 or less, and the nominal cross-sectional area is 170 mm 2 If the first groove 14, the second groove 15, and the third groove 16 of the contact wire 1 are not provided, the radial cross-sectional area is 168 mm 2 Above, 172mm2 The following is the result.
[0015] When power is supplied to a railway vehicle through the contact wire 1, the bottom of the large arc surface 12 comes into contact with the railway vehicle's current collector, such as a pantograph. As a result, the sliding of the current collector causes wear of the contact wire 1, starting from the bottom of the large arc surface 12. In general, the limit at which a worn contact wire can maintain its strength for safe use is called the wear limit.
[0016] The wear limit position is a position in the height direction (parallel to the center line 20) of the contact wire 1 that indicates the wear limit of the contact wire 1 when uniform wear occurs so that the wear surface becomes horizontal. If the uniform wear progresses beyond the wear limit position, the cross-sectional area falls below the level at which the strength required for safe use can be maintained, increasing the risk of wire breakage.
[0017] For example, if the nominal cross-sectional area of contact wire 1 is 110 cm 2 In this case, the distance in the height direction of the contact wire 1 between the wear limit position and the upper end of the contact wire 1 is 7 mm, and the nominal cross-sectional area of the contact wire 1 is 170 cm 2 In this case, the vertical distance between the wear limit position and the upper end of the trolley wire 1 is 9 mm.
[0018] The first groove 14 is provided at a position close to but below the wear limit position. Therefore, from the disappearance of the first groove 14 due to wear, it can be known that the wear has reached or is about to reach the wear limit position.
[0019] Distance D between the upper end of the first groove 14 and the upper end of the trolley wire 1 in the height direction of the trolley wire 1 1 is set to a value equal to or close to the distance between the wear limit position and the top end of the contact wire 1 in the height direction of the contact wire 1. 1 For example, if the nominal cross-sectional area of contact wire 1 is 110 cm 2 If the nominal cross-sectional area of the contact wire 1 is 170 cm 2 In the case where , it is 9 mm or more and 9.1 mm or less.
[0020] The second groove 15 is provided below the first groove 14, and can be used as a groove for preventing uneven wear (inclined wear) to detect the occurrence of uneven wear before the first groove 14 disappears, or as a groove for predicting replacement to detect when the wear is approaching the wear limit position in order to provide a preparation period for replacement work of the trolley wire 1.
[0021] The second groove 15 is preferably provided at a position such that, when uneven wear occurs in the trolley wire 1, the first groove 14 on one side of the trolley wire 1 does not disappear before the second groove 15 on the other side of the trolley wire 1 disappears. 2 For example, if the nominal cross-sectional area of contact wire 1 is 110 cm 2 In the case where the nominal cross-sectional area of the contact wire 1 is 170 cm2, the contact wire 1 is 8 mm or more and 8.1 mm or less. 2 In the case where , it is 10 mm or more and 10.1 mm or less.
[0022] The third groove 16 is located at the lowest of the three grooves, the first groove 14, the second groove 15, and the third groove 16, and opens in a direction closest to the vertically downward direction. Furthermore, as described above, the depth of the third groove 16 is greater than the depths of the first groove 14 and the second groove 15. Therefore, the third groove 16 has high visibility from the ground when the contact wire 1 is suspended, and it is possible to observe whether the third groove 16 has disappeared using a wide range of means, such as observation using binoculars from the ground. In other words, an inspection vehicle is not required to observe whether the third groove 16 has disappeared.
[0023] Therefore, in the wear inspection of the trolley wire 1, observation can be performed by a method other than the camera of the inspection vehicle until disappearance of the third groove 16 is confirmed. This makes it possible to reduce costs, such as time, labor, and money, spent on the wear inspection of the trolley wire 1.
[0024] Distance D between the upper end of the third groove 16 and the upper end of the trolley wire 1 in the height direction of the trolley wire 1 3 In order to improve the visibility of the third groove 16 from the ground, the nominal cross-sectional area of the contact wire 1 is set to 110 cm2 When the nominal cross-sectional area of the contact wire 1 is 170 cm2, it is preferable that the cross-sectional area is 9 mm or more. 2 In this case, it is preferable that the thickness is 11 mm or more.
[0025] Also, the interval D 3 If the distance D is too large, the period until the third groove 16 disappears due to wear of the contact wire 1 becomes too short, and the cost reduction effect of wear inspection by providing the third groove 16 becomes small. 3 is the nominal cross-sectional area of contact wire 1 is 110 cm 2 In this case, the distance D is preferably 10 mm or less, and more preferably 9.1 mm or less. 3 is the nominal cross-sectional area of contact wire 1 is 170 cm 2 In this case, it is preferably 12 mm or less, and more preferably 11.1 mm or less.
[0026] FIG. 3 is an enlarged view of a part of the radial cross section of the contact wire 1. 2 3 is shown as an example of a cross section of the trolley wire 1. Hereinafter, the shapes and sizes of the first groove 14, the second groove 15, and the third groove 16 will be described using FIG.
[0027] The first groove 14, the second groove 15, and the third groove 16 are formed, for example, so that the shape in the radial cross section of the trolley wire 1 is semicircular. In this case, the radii of curvature of the first groove 14, the second groove 15, and the third groove 16 in the radial cross section of the trolley wire 1 are each R 1 , R 2 , R 3 The radii of curvature of the edges 140, 150, and 160 of the first groove 14, the second groove 15, and the third groove 16 in the radial cross section of the contact wire 1 are respectively R 4 , R 5 , R 6 Let us assume that.
[0028] The radius of curvature R of the third groove 16 3In this case, the width and depth of the third groove 16 in the radial cross section of the trolley wire 1 are 0.3 mm or more, and the visibility of the third groove 16 from the ground when the trolley wire 1 is suspended is improved. On the other hand, the curvature radius R 3 As the radius of curvature R of the third groove 16 increases, the radial cross-sectional area of the trolley wire 1 decreases, resulting in a decrease in the strength of the trolley wire 1. 3 It is preferable that the thickness is 0.4 mm or less.
[0029] Furthermore, the radius of curvature R of the edge 160 of the third groove 16 6 However, it is preferable that the thickness of the third groove 16 is 0.2 mm or less. In this case, the upper portion 161 of the inner surface of the third groove 16 becomes nearly flat, and the visibility of the third groove 16 from the ground when the trolley wire 1 is strung is further improved.
[0030] That is, it is preferable that the shape of the third groove 16 in the radial cross section of the trolley wire 1 is semicircular with a radius of curvature of 0.3 mm or more and 0.4 mm or less, and in addition, it is more preferable that the radius of curvature of the edge 160 of the third groove 16 in the radial cross section of the trolley wire 1 is 0.2 mm or less.
[0031] Radius of curvature R of the first groove 14 1 and the radius of curvature R of the second groove 15 2 In order to suppress a decrease in the cross-sectional area of the trolley wire 1 in the radial direction, the radius of curvature R of the edge 140 of the first groove 14 is preferably 0.21 mm or less, for example, 0.20 mm or more and 0.21 mm or less. 4 and the radius of curvature R of the edge 150 of the second groove 15 5 is, for example, 0.20 mm or more and 0.21 mm or less.
[0032] (Method of controlling wear of contact wire) An example of a method for managing wear of the trolley wire 1 according to the present embodiment will be described below.
[0033] First, from the start of wear inspection of the contact wire 1 until disappearance of the third groove 16 due to wear is confirmed, the third groove 16 is observed, for example, by observation using binoculars from the ground.
[0034] After the disappearance of the third groove 16 due to wear is confirmed, the second groove 15 is observed using the camera of the inspection vehicle. For example, when the disappearance of the second groove 15 is confirmed by observing one side of the contact wire 1, the other side is observed to check whether the wear that has occurred is uneven wear, and if it is uneven wear, the inclination direction and the magnitude of the inclination are examined.
[0035] As a result, if it is confirmed that the wear is uneven, it is possible to immediately replace the trolley wire 1 depending on the angle of the wear surface from the horizontal direction, or to predict the time until the wear limit is reached and prepare for replacement work. If it is confirmed that the wear is not uneven, that is, that the wear surface is horizontal, it is possible to continue using the trolley wire 1 until the first groove 14 disappears while preparing for replacement work. The first groove 14 is also observed using a camera of the inspection car, similar to the observation of the second groove 15.
[0036] (Effects of the embodiment) According to the trolley wire 1 according to the embodiment of the present invention, wear inspection can be performed without using a camera of an inspection vehicle until disappearance of the third groove 16 is confirmed. This makes it possible to reduce costs, such as time, labor, and money, spent on wear inspection of the trolley wire 1.
[0037] (Summary of the embodiment) Next, the technical ideas grasped from the above-described embodiment will be described by using the reference numerals and the like in the embodiment. 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 embodiment.
[0038] [1] A contact wire (1) comprising: a first groove (14) linearly extending along the longitudinal direction and provided at a position below the wear limit position on both side surfaces; a second groove (15) linearly extending along the longitudinal direction and provided below the first groove (14) on both side surfaces; and a third groove (16) linearly extending along the longitudinal direction and provided below the second groove (15) on both side surfaces, wherein the third groove (16) is deeper than the first groove (14) and the second groove (15).
[0039] [2] The trolley wire (1) described in [1] above, wherein the shape of the third groove (16) in a radial cross section of the trolley wire (1) is a semicircle having a radius of curvature of 0.3 mm or more and 0.4 mm or less.
[0040] [3] The trolley wire (1) according to [2] above, wherein the radius of curvature of the edge (160) of the third groove (16) in a radial cross section of the trolley wire (1) is 0.2 mm or less.
[0041] [4] Nominal cross-sectional area is 110 cm 2 The trolley wire (1) according to any one of claims [1] to [3] above, wherein a distance between an upper end of the third groove (16) and an upper end of the trolley wire (1) in the height direction of the trolley wire (1) is 9 mm or more and 10 mm or less.
[0042] [5] Nominal cross-sectional area is 170 cm 2 The trolley wire (1) according to any one of claims [1] to [3] above, wherein a distance between an upper end of the third groove (16) and an upper end of the trolley wire (1) in the height direction of the trolley wire (1) is 11 mm or more and 12 mm or less.
[0043] Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit and scope of the invention.
[0044] In addition, the above-described embodiments do not limit the scope of the invention according to the claims. Also, it should be noted that not all of the combinations of features described in the embodiments are essential to the means for solving the problems of the invention. [Explanation of symbols]
[0045] 1 Contact wire 14 First Groove 15 The Second Groove 16 The Third Groove 160 Edge of the third groove
Claims
1. A linear first groove is provided along the longitudinal direction at a position equal to or lower than the wear limit position on both side surfaces; a linear second groove provided below the first groove on each of the two side surfaces and extending in the longitudinal direction; a linear third groove provided below the second groove on each of the two side surfaces and extending in the longitudinal direction; Equipped with The third groove is deeper than the first groove and the second groove. Trolley wire.
2. The shape of the third groove in a radial cross section of the trolley wire is a semicircle having a radius of curvature of 0.3 mm or more and 0.4 mm or less. The contact wire according to claim 1.
3. The radius of curvature of the edge of the third groove in the radial cross section of the trolley wire is 0.2 mm or less. The contact wire according to claim 2.
4. Nominal cross-sectional area is 110 cm ２ and The distance between the upper end of the third groove and the upper end of the trolley wire in the height direction of the trolley wire is 9 mm or more and 10 mm or less. The trolley wire according to any one of claims 1 to 3.
5. Nominal cross-sectional area is 170 cm ２ and The distance between the upper end of the third groove and the upper end of the trolley wire in the height direction of the trolley wire is 11 mm or more and 12 mm or less. The trolley wire according to any one of claims 1 to 3.
Citation Information
Patent Citations
Trolley wire
JP2021059248A