Covered member and covering method

Abstract

To provide a covering member and a covering method that are superior in workability improvement and long term stability.SOLUTION: Provided is a covering member 1 and a covering method. In the substantially cylindrical covering member 1 for covering an outer periphery of a long overhead power line 50 of an electric train, an inner periphery thereof is formed to be longer than an outer periphery of the overhead power line 50 of the electric train, and at least a part of a peripheral side part consists of a self-bonding member 10 having a self-bonding property across the whole length in an axial direction.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a coated member and a coating method. [Background technology]

[0002] There is a risk that electric train overhead lines may come into contact with overhead poles due to wind or other factors, causing a short circuit. To prevent this from happening, electric train overhead lines are generally equipped with a covering member that covers the outer periphery of the lines. A heat-shrinkable tube that is heat-shrinkable in the radial direction is known as such a covering member (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-182924 Summary of the Invention [Problem to be solved by the invention]

[0004] When covering an existing object such as an overhead electric train wire with heat-shrinkable tubing, it is necessary to remove a connector or a pipe joint before inserting the heat-shrinkable tubing, and then reattach the connector or the pipe joint after the insertion, which reduces workability. On the other hand, when covering the object by wrapping adhesive tape, the applied coating becomes thin, which may make it difficult to form an insulating coating over the long term. Furthermore, when covering a long object or an object with a large pipe diameter by wrapping adhesive tape, there is also the problem of reduced workability.

[0005] An object of the present invention is to provide a coated member and a coating method that are easy to work with and have excellent long-term stability. [Means for solving the problem]

[0006] (1) In one embodiment for achieving the above object, the covering member is a substantially cylindrical covering member for covering the outer periphery of a long electric train overhead line, and is formed so that its inner periphery is longer than the outer periphery of the electric train overhead line, and at least a portion of the peripheral side portion is made of a self-fusing member that has self-fusing properties over the entire axial length. (2) In another embodiment of the covering member, preferably, the region consisting of the self-fusing member may have a thin-walled portion formed thinner than other portions over the entire axial length. (3) In the covering member according to another embodiment, preferably, the thin-walled portion may be provided on both sides with inclined surfaces that gradually become thinner toward the thin-walled portion. (4) In the covering member according to another embodiment, preferably, an opening extending over the entire axial length may be provided in the region made of the self-fusing member. (5) In the covering member according to another embodiment, preferably, the opening may have an inclined surface that gradually becomes thinner toward both ends thereof. (6) In another embodiment of the covering member, preferably, one end of the opening is wound with a smaller diameter than the other end of the opening, and the one end and the other end are arranged to overlap along the circumferential direction, and the one end and the other end of the opening may be arranged to be spaced apart from each other in the radial direction. (7) In the covering member according to another embodiment, the self-fusing member may preferably be a self-fusing silicone rubber. (8) In another embodiment, the covering member is preferably composed of the self-fusing member and a non-self-fusing member that does not have self-fusing properties, and the non-self-fusing member may be silicone rubber. (9) The covering member according to another embodiment may preferably be a long member formed by extrusion molding. (10) A covering method according to one embodiment for achieving the above object is a method for covering the outer periphery of a long electric train overhead wire using any of the covering members described above, and includes a covering step of wrapping the self-fusing member around the outer periphery of the electric train overhead wire from an opening portion that opens along the axial direction in a region made of the self-fusing member, and a joining step of overlapping and joining both ends of the opening portion made of the self-fusing member while the self-fusing member is wrapped around the outer periphery of the electric train overhead wire. (11) A covering method according to another embodiment may preferably further include a cutting step of cutting the region made of the self-fusing member along the axial direction to form the opening portion. (12) In another embodiment of the coating method, the cutting step may preferably include cutting along a thin-walled portion that is thinner than other portions over the entire axial length in the region consisting of the self-fusing member. (13) In another embodiment of the coating method, the coating step may preferably be performed by wrapping the coated object around the outer periphery of the object through an opening formed in the region consisting of the self-fusing member so as to open over the entire axial length. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a coated member and a coating method that have improved workability and excellent long-term stability. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of a covering member according to a first embodiment of the present invention. [Figure 2] 2 shows a longitudinal cross-sectional view of the covering member of FIG. 1. FIG. [Figure 3] FIG. 3 is a vertical cross-sectional view showing a state in which a train overhead wire is covered with the covering member of FIG. [Figure 4] FIG. 4 is a longitudinal sectional view of a covering member according to a second embodiment of the present invention, taken in the same direction as FIG. [Figure 5] FIG. 5 is a vertical cross-sectional view showing a state in which an electric train overhead line is covered with the covering member of FIG. [Figure 6]FIG. 6 is a longitudinal sectional view taken in the same direction as FIG. 2 of a covering member according to a third embodiment of the present invention. [Figure 7] FIG. 7 is a longitudinal sectional view taken in the same direction as FIG. 2 of a covering member according to a fourth embodiment of the present invention. [Figure 8] FIG. 8 is a longitudinal sectional view of a covering member according to a fifth embodiment of the present invention, taken in the same direction as FIG. [Figure 9] FIG. 9 shows a diagram for explaining a part of the method for manufacturing the coated member according to the first embodiment. [Figure 10] FIG. 10 shows an example of a flow of main steps of a coating method using the coating member according to the first embodiment. [Figure 11] FIG. 11 shows the state of each step of the coating method of FIG. 10 in vertical cross section. DETAILED DESCRIPTION OF THE INVENTION

[0009] Next, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments described below do not limit the invention according to the claims, and not all of the elements and combinations thereof described in the embodiments are necessarily essential to the solution of the present invention.

[0010] 1. Covering material (First embodiment) Fig. 1 shows a perspective view of a covering member according to a first embodiment of the present invention. Fig. 2 shows a longitudinal cross-sectional view of the covering member of Fig. 1. Fig. 3 shows a longitudinal cross-sectional view of an electric train overhead line covered with the covering member of Fig. 1. The longitudinal cross-sectional view is a cross-sectional view cut perpendicular to the axial direction of the covering member. This also applies to the following embodiments.

[0011] The covering member 1 according to this embodiment is, for example, a substantially cylindrical, long member for covering the outer periphery of a long electric train overhead wire 50. The covering member 1 is formed so that its inner periphery is longer than the outer periphery of the electric train overhead wire 50, and at least a portion of its circumferential side is made of a self-fusing member 10 that has self-fusing properties along the entire axial length (the depth direction of the paper in FIG. 2 ). The covering member 1 has a hollow portion 30 along the axial direction. The hollow portion 30 is a portion into which the electric train overhead wire 50 can be placed when covering the electric train overhead wire 50. In this embodiment, the covering member 1 is a member for at least insulating the electric train overhead wire 50. However, the covering member 1 may be a member for waterproofing and / or rust-proofing in addition to insulating covering. Furthermore, the covering member 1 may be a member for waterproofing and / or rust-proofing instead of insulating covering.

[0012] In this embodiment, the covering member 1 is composed of a self-fusing member 10 and a non-self-fusing member 20 that does not have self-fusing properties. The covering member 1 preferably includes a thin-walled portion 12 formed thinner than other portions over the entire axial length of the region consisting of the self-fusing member 10. The thickness of the thin-walled portion 12 is preferably such that it can be easily torn with a cutting tool such as scissors or a utility knife, or by hand. Specifically, the thickness of the thin-walled portion 12 is preferably 0.05 to 1 mm, more preferably 0.1 to 0.5 mm. The thickness of the region of the covering member 1 other than the thin-walled portion 12 is preferably 1 to 10 mm, more preferably 2 to 5 mm. However, the thickness of the covering member 1 is preferably designed appropriately depending on the type and application of the electric train overhead line 50. The covering member 1 also preferably includes inclined surfaces 14, 14 on both sides of the thin-walled portion 12, which gradually become thinner toward the thin-walled portion 12. In this embodiment, the inclined surface 14 is a curved surface that gradually becomes thinner toward the thin-walled portion 12. However, there are no particular restrictions on the shape of the inclined surface 14 as long as it gradually becomes thinner toward the thin-walled portion 12, and it may be, for example, an inclined surface that becomes thinner linearly toward the thin-walled portion 12. In the covering member 1, the area made of the self-fusing member 10 preferably occupies 5% or more and less than 100% of the inner circumference (or outer circumference) of the covering member 1.

[0013] The self-fusing member 10 is preferably a self-fusing silicone rubber. The self-fusing silicone rubber is a cured product obtained by curing a silicone composition containing a diorganopolysiloxane represented by the following average composition formula (I) and a boric acid compound.

[0014] [ka] (R in formula (I) 1 is a hydrocarbon group having 1 to 10 carbon atoms, and n is 1.98 to 2.02.

[0015] R in formula (I) 1 is a hydrocarbon group having 1 to 10 carbon atoms, preferably 1 to 8 carbon atoms. Examples of the hydrocarbon group include an alkyl group, a cycloalkyl group, an alkenyl group, and an aryl group. Examples of the alkyl group include a methyl group, an ethyl group, a propyl group, and a butyl group. Examples of the cycloalkyl group include a cyclohexyl group. Examples of the alkenyl group include a vinyl group, an allyl group, a butenyl group, and a hexenyl group. Examples of the aryl group include a phenyl group and a tolyl group. In addition, R 1 The R may be a group in which some or all of the hydrogen atoms of the hydrocarbon group have been substituted with halogen atoms, cyano groups, etc. When curing the silicone composition, if curing is accelerated with an organic peroxide, as described below, R 1 is preferably an alkenyl group or an alkenyl group in which some or all of the hydrogen atoms have been substituted with halogen atoms or cyano groups. In formula (I), n is 1.98 to 2.02. If the value of n is outside this range, self-bonding properties may not be obtained.

[0016] The kinematic viscosity of the diorganopolysiloxane at 25° C. is preferably 100 to 100,000,000 cSt, and more preferably 100,000 to 10,000,000 cSt. When the diorganopolysiloxane has a kinematic viscosity at 25° C. within this range, the diorganopolysiloxane exhibits excellent handleability before curing and excellent mechanical properties after curing.

[0017] Examples of boric acid compounds include boric acid and derivatives of boric acid anhydride. Examples of boric acid include boric acid anhydride, pyroboric acid, and orthoboric acid. Examples of derivatives of boric acid anhydride include trimethyl borate, triethyl borate, and trimethoxyboroxine. Furthermore, polyorganoborosiloxanes obtained by condensing organoalkoxysilanes such as dimethyldimethoxysilane or dimethyldiethoxysilane with boric acid anhydride can also be used as boric acid compounds. One type of boric acid compound may be used alone, or two or more types may be used in combination.

[0018] The content of the boric acid compound in the silicone composition is preferably 0.1 to 50 parts by mass, more preferably 0.5 to 30 parts by mass, and even more preferably 1 to 5 parts by mass, per 100 parts by mass of the diorganopolysiloxane. If the content of the boric acid compound is equal to or greater than the lower limit, sufficient self-bonding properties can be ensured, and if it is equal to or less than the upper limit, deterioration of mechanical properties can be suppressed.

[0019] The silicone composition may contain an organic peroxide to accelerate its curing. Examples of organic peroxides include hydroperoxides, dialkyl peroxides, peroxyesters, diacyl peroxides, and peroxydicarbonates. These organic peroxides may be used alone or in combination of two or more.

[0020] The content of the organic peroxide in the silicone composition is preferably 0.1 to 10 parts by mass, and more preferably 0.5 to 3.0 parts by mass, per 100 parts by mass of the diorganopolysiloxane. If the content of the organic peroxide is equal to or greater than the lower limit, curing can be sufficiently promoted. However, if the content of the organic peroxide exceeds the upper limit, curing promotion commensurate with the content will no longer be observed.

[0021] The non-self-fusing member 20 is preferably silicone rubber. The non-self-fusing member 20 is more preferably a curable silicone rubber composition that is uncured or semi-cured before use and cured after being wrapped around the outer periphery of the object to be coated 50. Curable silicone rubber compositions are generally broadly divided into two types. One of these two types of curable silicone rubber compositions is a so-called addition reaction curable silicone rubber composition that is stored at low temperatures when not in use and cured by heating above room temperature when curing. The other is a so-called condensation reaction curable silicone rubber composition that is stored in a dry environment (moisture-proof environment) when not in use and cured by absorbing moisture from the air when curing. The non-self-fusing member 20 may be an addition reaction curable silicone rubber composition or a condensation reaction curable silicone rubber composition. However, considering ease of handling, for example, when coating the outer periphery of an existing object to be coated 50, a condensation reaction curable silicone rubber composition is preferred. The non-self-fusing member 20 preferably has a Williams plasticity at 25°C in the range of 50 to 500. The Williams plasticity is measured using a parallel plate plasticity meter (Williams plasticity meter) in accordance with the measurement method specified in JIS K 6249 "Test methods for uncured and cured silicone rubber."

[0022] The self-fusing member 10 and the non-self-fusing member 20 preferably have a dielectric breakdown strength of 10 to 20 kV / mm, and more preferably 15 kV / mm. The dielectric breakdown strengths of the self-fusing member 10 and the non-self-fusing member 20 are measured in accordance with JIS C2110-1 by a short-time dielectric breakdown test using an air method.

[0023] The covering member 1 is preferably wound around the electric train overhead wire 50 by inserting the electric train overhead wire 50 into the hollow portion 30 through an opening portion 16 (see FIG. 11 ) created by cutting the thin-walled portion 12 and then wrapping the covering member 1 around the electric train overhead wire 50 (see FIG. 3 ). The inner circumference of the covering member 1 is formed to be longer than the outer circumference of the electric train overhead wire 50, so that both ends of the opening portion 16 made of the self-fusing member 10 overlap when the covering member 1 is wrapped around the electric train overhead wire 50. The overlapping both ends of the opening portion 16 of the covering member 1 then join by self-fusing, allowing the covering member 1 to cover the outer circumference of the electric train overhead wire 50 (see FIG. 3 ). Therefore, covering the outer circumference of an extremely long electric train overhead wire 50 or an electric train overhead wire 50 with a large diameter, or even an existing electric train overhead wire, is easy. Furthermore, with the covering member 1, it is easier to design a thicker covering to be laid on the electric train overhead line 50 than if the electric train overhead line 50 were covered by wrapping adhesive tape or the like around it, and it is possible to form an insulating covering that is stable over the long term. Furthermore, because the covering member 1 has inclined surfaces 14, 14 on both sides of the thin-walled portion 12, both ends of the opening portion 16 overlap along the inclined surfaces 14, 14. Therefore, the covering member 1 has a smaller gap between the inner peripheral surface of one end of the opening portion 16 and the outer peripheral surface of the other end, which improves the strength of the self-welding bond and allows for the formation of an insulating covering that is stable over the long term. The covering method will be described in detail later.

[0024] (Second embodiment) Next, a description will be given of a covering member according to a second embodiment. Portions common to the previous embodiment will be given the same reference numerals and redundant description will be omitted.

[0025] Fig. 4 shows a longitudinal cross-sectional view of a covering member according to a second embodiment of the present invention, taken in the same view as Fig. 2. Fig. 5 shows a longitudinal cross-sectional view of a train overhead wire covered with the covering member of Fig. 4.

[0026] The covering member 1a of the second embodiment has a similar structure to the covering member 1 of the first embodiment, but differs from the covering member 1 of the first embodiment in that it is equipped with a self-fusing member 10a instead of the self-fusing member 10.

[0027] The covering member 1a has a thin-walled portion 12a formed thinner than other portions over the entire axial length in the region consisting of the self-fusing member 10a. The thickness of the thin-walled portion 12a is preferably within the range of the thickness of the thin-walled portion 12 described above. Unlike the covering member 1 according to the first embodiment, the covering member 1a does not have inclined surfaces 14, 14. More specifically, the thin-walled portion 12a is a notch formed in the region consisting of the self-fusing member 10a (see FIG. 4). Like the covering member 1, the covering member 1a is formed so that its inner circumference is longer than the outer circumference of the electric train overhead line 50.

[0028] In the covering member 1a, as in the covering member 1, the electric train overhead wire 50 is inserted into the hollow portion 30 through an opening formed by cutting the thin-walled portion 12a and then wrapped around the electric train overhead wire 50 (see FIG. 5). Similarly to the covering member 1, when the covering member 1a is wrapped around the electric train overhead wire 50, both ends of the opening formed by the self-fusing member 10 overlap. The overlapping portions of the covering member 1a then bond by self-fusing, thereby covering the outer periphery of the electric train overhead wire 50 (see FIG. 5). Thus, like the covering member 1, the covering member 1a can easily cover, for example, an extremely long electric train overhead wire 50, an electric train overhead wire 50 with a large diameter, or an existing electric train overhead wire. Furthermore, like the covering member 1, the covering member 1a also allows for a thicker coating to be easily designed for the electric train overhead wire 50 compared to a case in which adhesive tape or the like is wrapped around the electric train overhead wire 50, thereby forming an insulating coating that is stable over the long term.

[0029] (Third embodiment) Next, a description will be given of a covering member according to a third embodiment. Portions common to the previous embodiment will be given the same reference numerals and redundant description will be omitted.

[0030] FIG. 6 is a longitudinal sectional view taken in the same direction as FIG. 2 of a covering member according to a third embodiment of the present invention.

[0031] The covering member 1b of the third embodiment has a similar structure to the covering member 1 of the first embodiment, but differs from the covering member 1 of the first embodiment in that it has a self-fusing member 10b instead of the self-fusing member 10 and does not have a non-self-fusing member 20.

[0032] The covering member 1b is a substantially cylindrical, elongated member made up of self-fusing members 10b. Like the covering member 1, the covering member 1b has a thin-walled portion 12b and inclined surfaces 14b, 14b. That is, the covering member 1b is similar to the covering member 1 according to the first embodiment, except that the covering member 1 does not have the non-self-fusing members 20 and is made up of only the self-fusing members 10b. This covering member 1b also provides the same effects as the covering member 1 according to the first embodiment.

[0033] (Fourth embodiment) Next, a description will be given of a covering member according to a fourth embodiment. Portions common to the previous embodiments will be given the same reference numerals and redundant description will be omitted.

[0034] FIG. 7 is a longitudinal sectional view taken in the same direction as FIG. 2 of a covering member according to a fourth embodiment of the present invention.

[0035] The covering member 1c according to the fourth embodiment is a substantially cylindrical, elongated member made of a self-fusing member 10c. The covering member 1c has a hollow portion 30c along the axial direction (the depth direction of the paper in FIG. 7 ) and an opening portion 16c that opens over the entire axial length. The covering member 1c is a substantially E-shaped member in which one end portion 17c of the opening portion 16c is wound with a smaller diameter than the other end portion 17d of the opening portion 16c, and the one end portion 17c and the other end portion 17d are arranged to overlap along the circumferential direction (see FIG. 7 ). The covering member 1c has one end portion 17c and the other end portion 17d of the opening portion 16c that are spaced apart from each other in the radial direction. The covering member 1c is formed so that its inner circumference is longer than the outer circumference of the electric train overhead line 50. The covering member 1c also has inclined surfaces 14c, 14c that gradually become thinner toward both end portions 17c, 17d of the opening portion 16c. The self-fusing member 10c is made of the same material as the self-fusing member 10, and therefore a detailed description thereof will be omitted.

[0036] Similar to the covering members 1 and 1a (see FIGS. 3 and 5), the covering member 1c is wound around the electric train overhead wire 50 by inserting the electric train overhead wire 50 into the hollow portion 30c through the opening 16c. When the covering member 1c is wound around the electric train overhead wire 50, one end 17c and the other end 17d of the opening 16c overlap and are joined by self-fusion. This allows the covering member 1c to cover the outer periphery of the electric train overhead wire 50. Therefore, the covering member 1c also achieves the same effects as the covering member 1 according to the first embodiment.

[0037] In this embodiment, the covering member 1c is composed only of the self-fusing member 10c. However, similar to the covering members 1 and 1a according to the first and second embodiments, the covering member 1c may be composed of both a self-fusing member and a non-self-fusing member. In this case, it is preferable that the covering member 1c has a predetermined region from both ends 17c and 17d of the opening 16c composed of the self-fusing member, and the remaining region composed of the non-self-fusing member. By forming only the predetermined region from both ends 17c and 17d of the opening 16c with the self-fusing member, handling when covering the outer periphery of the electric train overhead line 50 can be improved. The covering member 1c does not need to have inclined surfaces 14c. The covering member 1c may also be wound with a smaller diameter around the other end 17d of the opening 16c than around the one end 17c of the opening 16c.

[0038] (Fifth embodiment) Next, a description will be given of a covering member according to a fifth embodiment. Portions common to the previous embodiments will be given the same reference numerals and redundant description will be omitted.

[0039] FIG. 8 is a longitudinal sectional view of a covering member according to a fifth embodiment of the present invention, taken in the same direction as FIG.

[0040] The covering member 1d according to the fifth embodiment is a substantially cylindrical, elongated member composed of self-fusing members 10d, 10e and non-self-fusing members 20d. The covering member 1d has a hollow portion 30d extending along the axial direction (the depth direction of the paper in FIG. 8). The covering member 1d is formed so that its inner circumference is longer than the outer circumference of the electric train overhead line 50. The covering member 1d has an opening 16d that opens over the entire axial length in the region formed by the self-fusing members 10d, 10e. In the covering member 1d, the self-fusing members 10d and 10e are adjacent to each other across the opening 16d. The self-fusing member 10d is preferably provided in a predetermined area extending circumferentially from one end of the opening 16d, from the hollow portion 30d side. The self-fusing member 10e is preferably provided in a predetermined area extending circumferentially from the other end of the opening 16d, from the outer periphery side. The self-fusing member 10d and the non-self-fusing member 20d are made of the same materials as the self-fusing member 10 and the non-self-fusing member 20, respectively, and therefore detailed description thereof will be omitted.

[0041] Similar to the covering members 1 and 1a (see FIGS. 3 and 5), the covering member 1d is wound around the electric train overhead wire 50 such that the electric train overhead wire 50 is inserted into the hollow portion 30d through the opening 16d and the self-fusing members 10d overlap the self-fusing members 10e. With the covering member 1d wound around the electric train overhead wire 50, the overlapping self-fusing members 10e and 10d are joined by self-fusing. This allows the covering member 1d to cover the outer periphery of the electric train overhead wire 50. Therefore, similar to the covering member 1, the covering member 1d can easily cover, for example, the outer periphery of a very long electric train overhead wire 50 or an electric train overhead wire 50 with a large diameter, or even when covering the outer periphery of an existing electric train overhead wire. Similarly to the covering member 1, the covering member 1d also allows the covering film laid on the electric train overhead wire 50 to be thicker than when the electric train overhead wire 50 is covered by wrapping adhesive tape or the like around it, thereby forming an insulating covering that is stable over the long term. Note that, similar to the covering member 1c, the covering member 1d may have inclined surfaces that become gradually thinner toward both ends of the opening 16d. Furthermore, the covering member 1d may have a self-fusing member 10d on the outer periphery and a self-fusing member 10e on the hollow portion 30d side.

[0042] 2. Manufacturing method of coated member Next, a method for manufacturing the coated member will be described. Here, the method for manufacturing the coated member 1 will be described using the coated member 1 according to the first embodiment described above as an example.

[0043] 9A and 9B are diagrams for explaining a part of the method for manufacturing a coated member according to the first embodiment. A part of a mandrel unit used in a part of the manufacturing process of the coated member is shown in Fig. 9A. Also, a part of a see-through view of the perspective view of a is shown in Fig. 9B.

[0044] The covering member 1 is preferably formed by extrusion molding, more preferably by a two-color extrusion method using two extruders. An example of an apparatus that can be used to manufacture the covering member 1 includes an extruder capable of extruding the self-fusing member 10 (hereinafter also referred to as the "self-fusing member extruder"), an extruder capable of extruding the non-self-fusing member 20 (hereinafter also referred to as the "self-fusing member extruder"), and a mandrel unit 70 (see FIG. 9) connected to the self-fusing member extruder and the non-self-fusing member extruder. The mandrel unit 70 includes an inside mandrel 71, an outside mandrel 72, a die 73, a die holder 74, and connection flanges 76 and 78 (see FIG. 9). The connection flange 76 is a flange that can be connected to the self-fusing member extruder. The connection flange 78 is a flange that can be connected to the non-self-fusing member extruder. The self-adhesive member extruder and the non-self-adhesive member extruder are not particularly limited as long as they are extruders capable of extruding the self-adhesive member 10 and the non-self-adhesive member 20, respectively.

[0045] The coated member 1 is preferably manufactured as follows. First, the self-fusing member 10 extruded from the self-fusing member extruder flows into the mandrel unit via a connection flange 76. Then, the non-self-fusing member 20 extruded from the non-self-fusing member extruder flows into the mandrel unit 70 via a connection flange 78. The self-fusing member 10 and the non-self-fusing member 20 that flow into the mandrel unit 70 flow between an inside mandrel 71 and an outside mandrel 72, and then flow into a die 73 via a die holder 74. The die 73 is a member that controls the outer diameter of an extrusion molded body 80 made of the self-fusing member 10 and the non-self-fusing member 20 that flow from the die holder 74. In this embodiment, the self-fusing member 10 and the non-self-fusing member 20 flowing from the connection flanges 76, 78 are formed with thin-walled portions 12 and inclined surfaces 14, 14 between the time they flow into the inside mandrel 71 and the outside mandrel 72 and the time they flow into the die 73, and are molded into an extrusion molded body 80 having a shape similar to that of the covering member 1 (see FIG. 1 ). The extrusion molded body 80 extruded from the die 73 is then vulcanized in a vulcanization furnace (not shown), thereby producing the covering member 1. There are no particular restrictions on the configuration of the mandrel unit 70, as long as it is a unit that can receive the self-fusing member 10 and the non-self-fusing member 20 and extrude the extrusion molded body 80 having a shape similar to that of the covering member 1.

[0046] The coated members 1a and 1d according to the second and fifth embodiments can also be manufactured by a method similar to the method for manufacturing the coated member 1 described above. In the method for manufacturing the coated member 1a, the self-fusing components 10 and non-self-fusing components 20 flowing from the connection flanges 76 and 78 are required to form thin-walled portions 12 between the time they flow into the inside mandrel 71 and the outside mandrel 72 and the time they flow into the die 73, thereby forming an extrusion molded product having a similar shape to the coated member 1a (see FIG. 4). In the method for manufacturing the coated member 1d, the self-fusing components 10 and non-self-fusing components 20 flowing from the connection flanges 76 and 78 are required to form openings 16d between the time they flow into the inside mandrel 71 and the outside mandrel 72 and the time they flow into the die 73, thereby forming an extrusion molded product having a similar shape to the coated member 1d (see FIG. 8).

[0047] Furthermore, the coated members 1b and 1c according to the third and fourth embodiments can also be manufactured using a method similar to the method for manufacturing the coated member 1 described above. However, because the coated members 1b and 1c do not include the non-self-fusing member 20, the non-self-fusing member extrusion machine and the connection flange 78 are unnecessary. In the method for manufacturing the coated member 1b, the self-fusing member 10 flowing in from the connection flange 76 flows between the inside mandrel 71 and the outside mandrel 72 and flows out into the die 73 via the die holder 74. The self-fusing member 10 flowing in from the connection flange 76 forms the thin-walled portion 12 and the inclined surfaces 14, 14 between flowing into the inside mandrel 71 and the outside mandrel 72 and flowing out into the die 73, and is then molded into an extrusion-molded product having a shape similar to that of the coated member 1b (see FIG. 6). Similarly, in the manufacturing method of the covering member 1c, the self-fusing member 10 flowing in from the connection flange 76 has an opening 16c and inclined surfaces 14c, 14c formed between the time it flows into the inside mandrel 71 and the outside mandrel 72 and the time it flows out into the die 73, and is molded into an extruded body having a shape similar to that of the covering member 1c (see Figure 7).

[0048] 3. Coating method Next, a coating method according to an embodiment of the present invention will be described. Here, as an example of the coating method according to an embodiment of the present invention, a coating method using the coated member 1 according to the first embodiment will be described.

[0049] Fig. 10 shows an example of a flow of main steps of a coating method using the coating member according to embodiment 1. Fig. 11 shows the status of each step of the coating method of Fig. 10 in a vertical cross-sectional view.

[0050] The coating method according to this embodiment includes a cutting step (S100), a coating step (S110), and a joining step (S120). Each step will be described below.

[0051] 3.1 Cutting process (S100) The cutting step is a step of cutting the region made of the self-fusing member 10 along the axial direction (the depth direction of the paper in FIG. 11 ) to form the opening portion 16. In this embodiment, the cutting step preferably cuts along the thin-walled portion 12 formed in the region made of the self-fusing member 10 to form the opening portion 16 (see FIG. 11 a). More specifically, in the cutting step, the worker uses a cutting tool such as scissors or a utility knife, or tears the thin-walled portion 12 by hand, to form the opening portion 16.

[0052] 3.2 Coating process (S110) The covering process is a process of wrapping the covering member 1 around the outer periphery of the electric train overhead wire 50 from the opening portion 16 to cover it (see Fig. 11 b and c). More specifically, in the covering process, the covering member 1 is wrapped around the outer periphery of the electric train overhead wire 50 from one end 17a of the opening portion 16 so as to insert the electric train overhead wire 50 into the hollow portion 30 from the opening portion 16. At this time, because the inner periphery of the covering member 1 is formed to be longer than the outer periphery of the electric train overhead wire 50, the other end 17b of the opening portion 16 overlaps the one end 17a of the opening portion 16 made of the self-fusing member 10 (see Fig. 11 c). In this embodiment, the covering member 1 has inclined surfaces 14, 14 on both sides of the thin-walled portion 12, and therefore is wrapped around the outer periphery of the electric train overhead wire 50 so that the other end 17b of the opening portion 16 overlaps along the inclined surfaces 14 that are inclined toward the one end 17a of the opening portion 16. Therefore, in the covering process, the covering member 1 can be wrapped around the outer periphery of the electric train overhead wire 50 to cover it so that the gap between one end 17a of the opening portion 16 and the inner circumferential surface on the side of the other end 17b, and the gap between the other end 17b and the outer circumferential surface on the side of the one end 17a, are extremely small. By covering it in this way, the gap between the covering member 1 and the outer periphery of the electric train overhead wire 50 can also be made extremely small (see c in FIG. 11).

[0053] 3.3 Joining process (S120) The joining step is a step of overlapping and joining both ends 17a, 17b of the opening portion 16 made of the self-fusing member 10 while the covering member 1 is wound around the outer periphery of the electric train overhead wire 50 (see FIG. 11c). More specifically, in the joining step, the overlapping regions of the covering member 1, including both ends 17a, 17b of the opening portion 16, are joined by self-fusing. This allows the outer periphery of the object 50 to be covered by the covering member 1. In this embodiment, the covering member 1 has inclined surfaces 14, 14 on both sides of the thin-walled portion 12. Therefore, in the covering step, the covering member 1 is wrapped around the outer periphery of the electric train overhead wire 50 to cover it so that the gap between one end 17a of the opening portion 16 and the inner circumferential surface on the other end 17b side, and the gap between the other end 17b and the outer circumferential surface on the one end 17a side are very small. In this state, the region of the covering member 1 made of the self-fusing member 10 is joined by self-fusing, allowing the overlapping regions of the covering member 1 to be firmly joined. In this state, the gap between the covering member 1 and the outer periphery of the object 50 to be covered is also very small (see c in FIG. 11). Therefore, with this covering method, it is possible to form an insulating covering using the covering member 1 that is stable over the long term. Furthermore, with this covering method, it is possible to cover the outer periphery of the object 50 to be covered by a simple process of tearing the thin-walled portion 12 to form the opening 16, and then wrapping the covering member 1 around the object 50 so that the electric train overhead wire 50 is inserted through the opening 16 into the hollow portion 30. Therefore, it is easy to cover even when covering the outer periphery of a very long electric train overhead wire 50 or an electric train overhead wire 50 with a large diameter, or when covering the outer periphery of an existing electric train overhead wire, for example.

[0054] The covering members 1a and 1b according to the second and third embodiments can also cover the outer periphery of the electric train overhead wire 50 in a manner similar to the covering method described above (see FIG. 10). The covering members 1c and 1d according to the fourth and fifth embodiments can also cover the outer periphery of the electric train overhead wire in a manner similar to the covering method described above (see FIG. 10). However, in the covering method using the covering members 1c and 1d, it is preferable to omit the cutting step (S100). In the covering method using the covering members 1c and 1d, the covering step (S110) can be carried out by wrapping the covering members 1c and 1d around the outer periphery of the electric train overhead wire 50 so that the electric train overhead wire is inserted into the hollow portions 30c and 30d through the openings 16c and 16d formed in advance in the covering members 1c and 1d.

[0055] 4. Other embodiments As described above, the preferred embodiments of the present invention have been described, but the present invention is not limited to these and can be practiced in various modifications.

[0056] In the second embodiment described above, the covering member 1a was composed of a self-fusing member 10a and a non-self-fusing member 20a (see Figure 4), but it may also be composed of only the self-fusing member 10a, similar to the covering member 1b (see Figure 6).

[0057] Furthermore, in the fifth embodiment described above, the covering member 1d is composed of the self-fusing members 10d, 10e and the non-self-fusing member 20d (see FIG. 8), but it may be composed of only the self-fusing members 10d, 10e. That is, the covering member 1d may be a long member made of a substantially cylindrical self-fusing member having an opening 16d that opens over the entire axial length. In this case, the covering member 1d may have inclined surfaces that gradually become thinner toward both ends of the opening 16d.

[0058] Furthermore, the covering members 1, 1a, and 1b may not have the thin-walled portions 12, 12a, and 12b. That is, the covering members 1, 1a, and 1b may have a cylindrical shape with a constant thickness. In this case, in the cutting step (S100), the region consisting of the self-fusing members 10, 10a, and 10b may be cut along the axial direction with a cutting tool or the like to form openings.

[0059] Furthermore, instead of the self-fusing member 10, 10a, the covering member 1, 1a may have two adjacent separate self-fusing members, similar to the self-fusing members 10d, 10e of the covering member 1d (see FIG. 8). More specifically, one of the two self-fusing members is provided in a predetermined area from the hollow portion 30, 30a in a predetermined region along the circumferential direction from the thin-walled portion 12, 12a. The other of the two self-fusing members is disposed adjacent to the first self-fusing member across the thin-walled portion 12, 12a, and is provided in a predetermined area from the outer periphery. In this case, similar to the covering member 1d, when the covering member 1, 1a is wound around the electric train overhead wire 50, the self-fusing member provided on the hollow portion 30, 30a side overlaps the self-fusing member provided on the outer periphery, and they can be joined by self-fusing.

[0060] Furthermore, the covering member 1d may not have the opening 16d. In this case, it is preferable that the covering method using the covering member 1d is performed without omitting the cutting step (S100). More specifically, in the cutting step (S100), the boundary or the vicinity of the boundary between the self-fusing member 10d and the self-fusing member 10e may be cut along the axial direction with a cutting tool or the like to form the opening 16d.

[0061] Similarly to the covering member 1c (see FIG. 7), the covering member 1d may be a generally e-shaped member in which one end of the opening 16d is wound with a smaller diameter than the other end. In this case, it is preferable that the end of the covering member 1d provided with the self-fusing member 10e is wound with a smaller diameter than the end provided with the self-fusing member 10d.

[0062] The components of each of the above-described embodiments can be freely combined except in cases where they cannot be combined with each other. For example, the self-fusing members 10d and 10e and the non-self-fusing member 20d may be provided in the form of a covering member 1c. [Industrial Applicability]

[0063] The present invention can be used, for example, as a covering member and a covering method for covering the outer periphery of a long electric train overhead wire such as a railway overhead wire. [Explanation of symbols]

[0064] 1, 1a, 1b, 1c, 1d··· Covering member, 10, 10a, 10b, 10c, 10d, 10e··· Self-fusing member, 12, 12a, 12b··· Thin-walled portion, 14, 14b, 14c··· Inclined surface, 16··· Opening portion, 16c, 16d··· Opening, 17c··· One end of the opening, 17d··· Other end of the opening, 20, 20d··· Non-self-fusing member, 50··· Train overhead line.

Claims

1. A substantially cylindrical covering member for covering the outer periphery of a long electric train overhead line, The inner circumference is formed to be longer than the outer circumference of the electric train overhead line, At least a part of the circumferential side portion is made of a self-fusing member having self-fusing properties over the entire axial length, A covering member characterized in that, in the region made of the self-fusing member, a thin-walled portion formed thinner than other portions is provided over the entire axial length.

2. The covering member according to claim 1 , wherein the region made of the self-fusing member has an opening extending over the entire axial length.

3. 2. The covering member according to claim 1, wherein the thin-walled portion has on both sides inclined surfaces that become gradually thinner toward the thin-walled portion.

4. A substantially cylindrical covering member for covering the outer periphery of a long electric train overhead line, The inner circumference is formed to be longer than the outer circumference of the electric train overhead line, At least a part of the circumferential side portion is made of a self-fusing member having self-fusing properties over the entire axial length, an opening portion that opens over the entire axial length in the region made of the self-fusing member; A covering member characterized by having an inclined surface that gradually becomes thinner toward both ends of the opening.

5. One end of the opening is wound with a smaller diameter than the other end of the opening, and the one end and the other end are arranged to overlap along the circumferential direction, The covering member according to claim 4 , wherein the one end and the other end of the opening are spaced apart from each other in the radial direction.

6. 6. The covering member according to claim 1, wherein the self-fusing member is a self-fusing silicone rubber.

7. The self-fusing member and a non-self-fusing member that does not have self-fusing properties are included, 7. The covering member according to claim 1, wherein the non-self-fusing member is made of silicone rubber.

8. 8. The covering member according to claim 1, which is a long member formed by extrusion molding.

9. A method for covering an outer periphery of a long electric train overhead wire using the covering member according to any one of claims 1 to 8, a covering step of wrapping the self-fusing member around an outer periphery of the electric train overhead wire from an opening portion that opens in the axial direction in the region made of the self-fusing member; a joining step of overlapping and joining both ends of the opening portion made of the self-fusing member in a state where the opening portion is wound around the outer periphery of the electric train overhead line; A coating method comprising:

10. The coating method according to claim 9, further comprising a cutting step of cutting the region made of the self-fusing member along the axial direction to form the opening portion.

11. The coating method according to claim 10, wherein the cutting step cuts along a thin-walled portion formed thinner than other portions over the entire axial length in the region made of the self-fusing member.

12. 10. The covering method according to claim 9, wherein the covering step comprises wrapping the electric train overhead wire around an outer periphery thereof through an opening formed in the region of the self-fusing material so as to open over the entire axial length.

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