Drums and methods for reusing drums

Abstract

We provide a drum for winding trolley wire that can be used multiple times. [Solution] A drum 1 for winding trolley wire, comprising: a metal body 10 having a cylindrical body 11 and flanges 12 and 13 provided at each end of the body 11 and facing each other; a wooden first contact portion 21 provided on the outer circumference of the body 11 and interposed between the body 11 and the wound trolley wire 2; and wooden second contact portions 22 and 23 provided on the opposing surfaces 12a and 13a of the respective flanges 12 and 13 and interposed between the flanges 12 and 13 and the wound trolley wire. The second contact portions 22 and 23 are detachable from the flanges 12 and 13.

Description

Technical Field

[0001] The present invention relates to a drum and a method for reusing the drum.

Background Art

[0002] The trolley wire is used for an overhead wire or the like for supplying power to a train in an electric railway. The trolley wire manufactured at a factory is transported to the laying site of the overhead wire in a state of being wound around a drum.

[0003] The trolley wire is made of copper or a copper alloy and is a bare wire without a coating. Since a tension of about 3000 [kg] at maximum is applied to the laid trolley wire, if there is a trauma in the trolley wire, the trolley wire may break starting from the trauma. In order to prevent the occurrence of trauma in the trolley wire, the trolley wire before laying is wound around a drum made of a material softer than copper.

[0004] Patent Document 1 discloses a wooden drum around which a trolley wire is wound. The trolley wire is wound around the drum while being aligned under tension. Therefore, the wooden drum is deformed.

[0005] After the trolley wire is sent out from the drum, if the trolley wire is wound around the deformed drum again, problems such as sagging or biting of the trolley wire may occur. Sagging means that the wound upper trolley wire falls into the gap between the lower trolley wire. Biting means that the trolley wire enters the gap of the wood caused by deformation and cannot be pulled out.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] To avoid problems such as the trolley wire dropping or getting stuck, wooden drums were discarded once the wound trolley wire was fed out. In other words, the wooden drums were not meant to be reused multiple times. However, from the perspective of efficient resource utilization and cost reduction, there was a need for drums that could be used multiple times. [Means for solving the problem]

[0008] A brief overview of some of the representative embodiments disclosed in this application is as follows:

[0009] In a typical embodiment, the drum for winding the trolley wire has a metal body having a cylindrical body and flanges provided at each end of the body and facing each other, a wooden first contact portion provided on the outer circumference of the body and interposed between the body and the wound trolley wire, and wooden second contact portions provided on the opposing surfaces of each flange and interposed between the flange and the wound trolley wire. The second contact portions are detachable from the flanges. [Effects of the Invention]

[0010] According to a representative embodiment of the present invention, the drum for winding the trolley wire can be used multiple times. [Brief explanation of the drawing]

[0011] [Figure 1] This is an external view of the drum in an embodiment where the trolley wire is wound up. [Figure 2] This is an external view of the drum in an embodiment showing the state after the trolley wire has been fed out. [Figure 3] This is a cross-sectional view of the drum of an embodiment along line AA in Figure 2. [Modes for carrying out the invention]

[0012] Embodiments of the present invention will be described below. Note that the embodiments described below are merely examples for carrying out the present invention and do not limit the technical scope of the present invention.

[0013] <Overview> Figure 1 is an external view of the drum 1 in an embodiment where the trolley wire 2 is wound up. Figure 2 is an external view of the drum 1 after the trolley wire 2 has been unwound. Figure 3 is a cross-sectional view along line AA in Figure 2. The trolley wire 2 is made of, for example, copper or a copper alloy. The surface of the trolley wire 2 is uncoated. The trolley wire 2 manufactured in the factory is wound up on the drum 1 for storage and transported to the overhead line site in the wound state on the drum 1.

[0014] <Drum 1> The drum 1 has a main body 10 and a contact portion 20. The contact portion 20 is attached to the main body 10.

[0015] <Main body 10> The main body 10 is made of iron, for example. However, the main body 10 may be made of a metal other than iron, as long as it is harder than the copper trolley wire 2.

[0016] The main body 10 has a body portion 11 and flange portions 12 and 13. The body portion 11 is cylindrical with axis X as its central axis. The outer diameter of the body portion 11 is, for example, 600 mm to 800 mm. The length of the body portion 11 is, for example, 500 mm to 600 mm. The outer diameter and length of the body portion 11 are selected from suitable values ​​within the above ranges, depending on the length of the trolley wire 2 wound onto the drum 1.

[0017] The flanges 12 and 13 are discs with a diameter larger than the outer diameter of the body 11. Flange 12 is attached to one end of the body 11 in the direction along the axis X. Flange 13 is attached to the other end of the body 11 in the direction along the axis X. Flange 12 and flange 13 face each other with the body 11 in between. The flanges 12 and 13 are attached such that their centers are located on the axis X of the body 11.

[0018] The diameters of the flange portions 12 and 13 are, for example, 750 [mm] to 1350 [mm]. As the diameters of the flange portions 12 and 13, suitable values within the above range are adopted according to the length of the trolley wire 2 wound around the drum 1. The flange portions 12 and 13 have a thickness of about 15 [mm], for example. Note that the thickness of the flange portions 12 and 13 is not limited to the above value.

[0019] The surface of the flange portion 12 facing the flange portion 13 is called the facing surface 12a, and the surface different from the facing surface 12a is called the surface 12b. Similarly, the surface of the flange portion 13 facing the flange portion 12 is called the facing surface 13a, and the surface different from the facing surface 13a is called the surface 13b. Since the body portion 11 is provided between the flange portions 12 and 13, the facing surfaces 12a and 13a have an annular shape.

[0020] Note that in the following description, the side of the facing surfaces 12a and 13a of the flange portions 12 and 13 may be referred to as the inner side. Also, the side of the surfaces 12b and 13b of the flange portions 12 and 13 may be referred to as the outer side.

[0021] <Contact portion 20> The contact portion 20 has a first contact portion 21 and second contact portions 22 and 23. The first contact portion 21 is detachably attached to the outer peripheral surface of the body portion 11 of the main body portion 10. Specifically, the first contact portion 21 is composed of a plurality of wooden boards having long sides with a length equal to or substantially equal to the length of the side surface of the body portion 11. The plurality of wooden boards are arranged along the circumferential direction of the body portion 11 with their long sides adjacent to each other. Each wooden board constituting the first contact portion 21 is fixed to the body portion 11 by a fixing tool such as a nail, for example. In this case, for example, through holes are formed in the body portion 11 in advance, and the fixing tool inserted through the through holes from the inside of the body portion 11 is struck to fix the first contact portion 21 to the body portion 11.

[0022] The second contact portions 22 and 23 are detachably attached to the flange portions 12 and 13, respectively. In other words, a part of the contact portion 20 is detachably attached to the main body portion 10. The second contact portions 22 and 23 are made of wood, for example, with a thickness of about 25 mm. However, the thickness of the second contact portions 22 and 23 is not limited to the above value; for example, it can be 20 mm or more. As will be described later, the end of the trolley wire 2 wound on the drum 1 is fixed to the second contact portions 22 and 23 using fasteners 29 such as staples. For this reason, the second contact portions 22 and 23 only need to have a thickness that allows the fasteners 29 to be driven in.

[0023] The second contact portion 22 is attached to the opposing surface 12a of the flange portion 12. The second contact portion 23 is attached to the opposing surface 13a of the flange portion 13. The second contact portions 22 and 23 are rings corresponding to the shapes of the opposing surfaces 12a and 13a. That is, the outer diameters of the second contact portions 22 and 23 are equal to or approximately equal to the diameters of the flange portions 12 and 13. Also, the inner diameters of the second contact portions 22 and 23 are equal to or approximately equal to the diameter of the body portion 11 plus twice the thickness of the first contact portion 21.

[0024] Each of the second contact portions 22 and 23 is divided into multiple members. For example, the second contact portions 22 and 23 may be divided into two parts at 180-degree intervals around axis X, or into three parts at 120-degree intervals around axis X. These multiple members are combined to form the annular second contact portions 22 and 23, respectively.

[0025] A groove (not shown) is formed in the second contact portion 22 or the second contact portion 23. One end (winding start end) of the trolley wire 2 that is wound onto the drum 1 is accommodated in this groove.

[0026] The second contact portion 22 is attached to the opposing surface 12a of the flange portion 12 by a fastener 25, such as a nail. Specifically, the flange portion 12 has multiple through holes 26 through which the fastener 25 can be inserted. The second contact portion 22 is then placed on the opposing surface 12a and attached to the flange portion 12 by driving the fastener 25, which is inserted through the through holes 26, from the surface 12b.

[0027] The second contact portion 23 is similarly attached to the opposing surface 13a of the flange portion 13 by fasteners 27 such as nails. Specifically, the flange portion 13 has multiple through holes 28 through which the fasteners 27 can be inserted. The second contact portion 23 is then placed on the opposing surface 13a and attached to the flange portion 13 by driving the fasteners 27, which are inserted through the through holes 28, from the surface 13b.

[0028] <Winding up trolley wire 2> When winding the trolley wire 2 onto the drum 1, one end of the trolley wire 2 (winding start end) is first inserted into a groove (not shown) formed in the second contact portion 22 and fixed to the drum 1 with a fastener such as a bolt. Alternatively, the winding start end of the trolley wire 2 may be inserted into a groove formed in the second contact portion 23 and fixed to the drum 1.

[0029] The trolley wire 2 is then wound onto the first contact portion 21. The wound trolley wire 2 is aligned without gaps on the first contact portion 21 between the second contact portion 22 and the second contact portion 23, along the direction in which the axis X extends (aligned winding). During aligned winding, a tension of, for example, about 100 kg is applied to the trolley wire 2.

[0030] Specifically, first, the trolley wire 2 is wound in an aligned manner on the first contact portion 21 (first stage aligned winding). When the trolley wire 2 comes into contact with the second contact portion 23 due to the first stage aligned winding, the trolley wire 2 is wound on top of the first stage aligned winding of the trolley wire 2 and wound in an aligned manner toward the second contact portion 22 (second stage aligned winding). Then, when the trolley wire 2 comes into contact with the second contact portion 22, the trolley wire 2 is wound in an aligned manner toward the second contact portion 23 on the second stage aligned winding of the trolley wire 2 (third stage aligned winding). Thereafter, the aligned winding is repeated in the above manner until the desired length of trolley wire 2 is wound onto the drum 1.

[0031] As described above, after the trolley wire 2 is wound in multiple rows, the other end (winding end) of the trolley wire 2 is fixed to any location on the second contact portion 22 or the second contact portion 23. Specifically, the winding end of the trolley wire 2 is fixed using a fastener 29 such as a staple (U-shaped nail). In this case, the fastener 29 is driven into the second contact portion 22 or the second contact portion 23 with the winding end of the trolley wire 2 sandwiched between the U-shaped parts of the fastener 29. As a result, the winding end of the trolley wire 2 is fixed by being sandwiched between the fastener 29 and the second contact portion 22 or between the fastener 29 and the second contact portion 23.

[0032] Once the end of the trolley wire 2 is fixed, the trolley wire 2 is wound onto the drum 1 as shown in Figure 1. When the trolley wire 2 is wound onto the drum 1, it comes into contact with the first contact portion 21 and the second contact portions 22 and 23. That is, the first contact portion 21 is interposed between the body portion 11 and the trolley wire 2. The second contact portions 22 and 23 are interposed between the flange portions 12 and 13 and the trolley wire 2.

[0033] As described above, the trolley wire 2 is wound in an aligned manner while tension is applied. When the trolley wire 2 is wound in an aligned manner, outward forces F1 and F2 act from the trolley wire 2 on the second contact portion 22 and the second contact portion 23, as shown in Figure 1. In other words, forces F1 and F2 act on the second contact portion 22 and the second contact portion 23 in a direction that causes them to move apart from each other.

[0034] However, metal flanges 12 and 13, which are harder than the trolley wire 2, are provided on the outside of the second contact portions 22 and 23. That is, the second contact portion 22 is supported from the outside by the flange 12 against an outward force F1. Similarly, the second contact portion 23 is supported from the outside by the flange 13 against an outward force F2. As a result, the flanges 12 and 13 prevent the second contact portions 22 and 23 from deforming in a direction that separates them from each other due to forces F1 and F2.

[0035] However, since the second contact parts 22 and 23 are made of wood, which is softer than the trolley wire 2 made of copper or a copper alloy, there is a risk that deformation such as scratches or dents may occur on the surface that comes into contact with the trolley wire 2. For this reason, in the drum 1 of this embodiment, the drum can be reused by replacing the second contact parts 22 and 23.

[0036] <How to reuse Drum 1> After the trolley wire 2 is fed out from the drum 1, the drum 1 can be reused by removing the existing second contact parts 22 and 23 from the drum 1 and installing new, unused second contact parts 22 and 23. Specifically, first, after all of the trolley wire 2 that was wound on the drum 1 has been fed out, the second contact part 22 is removed from the flange part 12 using a tool such as a crowbar. The second contact part 23 is removed from the flange part 13 in the same manner.

[0037] Next, a new, unused second contact portion 22 is attached to the flange portion 12. Specifically, the new second contact portion 22 is positioned on the opposing surface 12a. As described above, the second contact portion 22 is formed in an annular shape by combining multiple members. The unused second contact portion 22 positioned on the opposing surface 12a is attached to the flange portion 12 by driving in a fastener 25 inserted through a through hole 26 from the surface 12b of the flange portion 12. Similarly, the new second contact portion 23 is positioned on the opposing surface 13a of the flange portion 13 and attached to the flange portion 13 by driving in a fastener 27 inserted through a through hole 28 from the surface 13b of the flange portion 13.

[0038] According to the embodiments described above, the following effects can be obtained.

[0039] The drum 1 of this embodiment has a metal body 10 and a wooden contact portion 20. The body 10 has a cylindrical body 11 and flanges 12 and 13 provided at each end of the body 11 and facing each other. The contact portion 20 has a first contact portion 21 provided on the outer circumference of the body 11 and second contact portions 22 and 23 provided on the opposing surfaces 12a and 13a of the respective flanges 12 and 13. When the trolley wire 2 is wound onto the drum 1, the first contact portion 21 is interposed between the body 11 and the trolley wire 2, and the second contact portions 22 and 23 are interposed between the flanges 12 and 13 and the trolley wire 2. The second contact portions 22 and 23 are detachable from the flanges 12 and 13.

[0040] In other words, the second contact portions 22 and 23 are supported from the outside by the flange portions 12 and 13 of the metal main body portion 10. Therefore, even when forces F1 and F2 are applied outward from the trolley wire 2 to the wooden second contact portions 22 and 23 by applying tension to the trolley wire 2 and winding it in an aligned manner, deformation of the second contact portions 22 and 23 is suppressed. Specifically, deformation of the second contact portions 22 and 23 in a direction that separates them from each other due to forces F1 and F2 is suppressed.

[0041] In the case of a drum made of a wooden body (hereinafter referred to as a wooden drum), when the trolley wire 2 is wound onto the wooden drum, the flange deforms so that it spreads outwards. When the trolley wire 2 is wound onto a wooden drum with such a deformed flange, problems such as the trolley wire 2 dropping or getting stuck occur, so wooden drums are discarded after being used once.

[0042] In contrast, in this embodiment, deformation of the second contact portions 22 and 23 in a direction that separates them from each other due to forces F1 and F2 is suppressed, so that the occurrence of stepping or jamming of the wound trolley wire 2 is suppressed. In other words, unlike wooden drums which were discarded after one use, the drum 1 can be used multiple times.

[0043] Furthermore, the second contact parts 22 and 23 are made of wood, which is softer than the trolley wire 2, which is made of copper or a copper alloy. Therefore, damage to the trolley wire 2 wound on the drum 1 is suppressed, but there is a risk that the second contact parts 22 and 23 may be deformed, such as scratches or dents, due to contact with the trolley wire 2. This deformation of the second contact parts 22 and 23 may cause problems such as stepping or jamming of the trolley wire 2.

[0044] In this embodiment, the second contact parts 22 and 23 are detachable. After the trolley wire 2 is fed out from the drum 1, the second contact parts 22 and 23 are removed from the flange parts 12 and 13, and unused second contact parts 22 and 23 are attached to the flange parts 12 and 13 respectively with fasteners 25 and 27. In other words, by replacing the second contact parts 22 and 23 that come into contact with the trolley wire 2 with unused second contact parts 22 and 23 that do not have any deformation such as scratches or dents on their surface, the drum 1 can be reused. That is, in the drum 1 of this embodiment, unlike wooden drums which are discarded as a whole after one use, only the second contact parts 22 and 23 are discarded, making it possible to reuse it multiple times. As a result, it is possible to make effective use of wood resources and contribute to reducing the environmental burden. In addition, since the only new component required for reuse is the second contact parts 22 and 23, it is possible to reduce costs compared to when the entire drum is newly prepared, as is the case with wooden drums.

[0045] Furthermore, in the drum 1 of this embodiment, the first contact portion 21 is also provided to be detachable. That is, if the surface of the first contact portion 21 becomes deformed, such as scratched or dented, due to the winding of the trolley wire 2 onto the drum 1, it can be replaced with a new, unused first contact portion 21. Specifically, first, the first contact portion 21 is removed from the drum body 11 using a tool such as a crowbar, similar to the case of the second contact portions 22 and 23.

[0046] Next, a new, unused first contact portion 21 is attached to the body portion 11. In this case, the new first contact portion 21 is positioned on the outer circumference of the body portion 11. The unused first contact portion 21 positioned on the outer circumference of the body portion 11 is then attached to the body portion 11 by driving a fastener, which is inserted through a through hole, into the body portion 11 from the inside.

[0047] The surface of the first contact portion 21 may also be deformed, such as scratches or dents, as the trolley wire 2 is wound onto it. Compared to the second contact portions 22 and 23, the deformation and damage to the first contact portion 21 are minor. Therefore, unlike the second contact portions 22 and 23, the first contact portion 21 does not need to be replaced every time, but it can be replaced if deformation occurs. As a result, damage to the trolley wire 2 wound on the drum 1 due to deformation of the first contact portion 21 is suppressed.

[0048] Although various embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and various modifications are included. Furthermore, the embodiments described above are described in detail for the purpose of explaining the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. In addition, the numerical values ​​and other figures included in the text and figures are merely examples, and using different values ​​will not impair the effects of the present invention. [Explanation of symbols]

[0049] 1 Drum, 2 Trolley wire, 10 Main body, 11 Body, 12, 13 Flange, 20 Contact part, 21 First contact part, 22, 23 Second contact part, 25, 27 Fixing device

Claims

1. It is a drum for winding up the trolley wire. A metal main body having a cylindrical body and flanges provided at each end of the body and facing each other, A wooden first contact portion is provided on the outer circumference of the body and interposed between the body and the wound trolley wire, It has a second wooden contact portion provided on the opposing surfaces of each of the flange portions and interposed between the flange portion and the wound trolley wire, The second contact portion is a drum that is detachably attached to the flange portion.

2. In the drum according to claim 1, A drum in which the thickness of the second contact portion is 20 mm or more.

3. A method for reusing a trolley wire winding drum, comprising a main body having a cylindrical metal body and metal flanges provided at each end of the body and facing each other, a first wooden contact portion provided on the outer circumference of the body, and a second wooden contact portion provided on the opposing surfaces of each of the flanges, After the trolley wire is fed out from the drum, the second contact portion is removed from the flange portion. A method for reusing a drum, comprising attaching unused second contact portions to each of the flange portions.

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