JP2013023134A - Electric car track section part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve arc-resistance of an electric car track section part.SOLUTION: The electric car tracks 12, 13, 14 in an air section part 10 of the electric car track are determined to be alumina content scatter reinforcement copper which is manufactured by an internal oxidation method and of which conductivity is 70% IACS or more and heat resistant temperature, 700°C or higher. The electric car track made of the alumina content scatter reinforcement copper is so excellent in the softening resistance and high in the arc resistance (since the heat resistance temperature is high) that remarkably reduces waste by arc compared with an electric car track comprising an alloy of the conventional tin and copper or stainless and the like even if the arc is generated in the section part each time the electric car passes. This improves the durability of the electric car track of the section part to extend the time for replacing the electric car track. Even if the electric car stops at the section part and the arc continues to be generated between the electric car track and a collector shoe, a serious accident is prevented since the current/time until the electric car track is melted to be cut is remarkably long and the long time for handling the accident is secured.

Description

  The present invention relates to an overhead electric train line (catenary overhead line) in which an electric line (electric locomotive, electric train) passes and a side current collecting type in which an electric line is provided on a side wall of the track. It is related with the section part in a rigid train line.

  In an electric railway, a current collecting shoe (pantograph or the like) slides on a train line to supply power, and an electric vehicle runs. The train line is provided along the entire length of the track. In this train line, when the sections that are electrically different (for example, sections with different voltages, AC sections and DC sections, etc.) are matched, the train lines are classified according to branching (point) sections, operational and maintenance reasons, etc. When doing so, it is necessary to insulate between the sections (branches). The insulating portion needs to be electrically insulated while mechanically connecting the train lines, and is called a section portion (current sorting device).

The section is classified into two types, one where the current is interrupted when the current collecting shoe passes and the other where there is no current. The former is a “dead section” and the latter is a general one. There are “air section”, “insulator section” and so on.
The dead section is made of FRP (Glass Fiber Reinforced Plastic) rods, for example, to divide sections with different voltages by DC or AC, or sections with different voltage phases in the AC electrification section. The train lines in different sections are mechanically and electrically insulated by the section insulator made of etc.
In addition, the air section overlaps both train lines in electrically different sections in a certain length in parallel, and uses the space between both train lines in the overlapping portion as an insulating portion. The insulator section is an electrically insulated section of both train lines in electrically different sections with an insulator such as an FRP or insulator, and is provided with a slider in parallel with the insulator section, similar to the air section. In many cases, the current is not interrupted, and those in which the current is interrupted without providing the slider are dead sections.

In each section, when power is transferred from one train line to the other with the passing of an electric car, an arc is generated between the train line and the current collecting shoe. Be exposed to the arc. When exposed to an arc, the train line gradually becomes hot and softens or wears out, and the function of the train line may not be exhibited. In addition, in the case of an overhead train line, there is a risk of breaking (melting) due to overhead tension due to softening and wear.
Further, when the electric vehicle stops in the air section for some reason, both train lines may be connected (panover) through the current collecting shoe, and may be cut off due to overcurrent. If the power on the train line is cut off, it will lead to a major accident.

Thus, in the section portion, the deterioration of the train line is more severe than in other portions due to the occurrence of an arc or the like, and thus countermeasures are desired.
On the other hand, there is a technology that employs an alumina dispersion strengthened copper alloy as a train wire having high vibration damping performance (see Patent Document 1, Claim 2, etc.).
In addition, a train line made of a precipitation strengthened copper alloy (PHC: Precipitation Hardening Copper) in which Cr and Zr are added to copper has been developed.

JP-A-10-250419 JP 2008-285906 A

As described above, a technique of using an alumina-dispersed copper alloy in a train line (trolley line) is disclosed (Patent Document 1 Abstract, Claim 1 and the like), and in Patent Document 1 paragraph 0018, to strengthen copper, There are two types of solid solution strengthening and precipitation strengthening, and solid solution strengthening is difficult to achieve both high strength and high conductivity, whereas precipitation strengthening can achieve both high strength and high conductivity. Yes. In view of the compatibility, it is said that the precipitation-strengthened alumina dispersion-strengthened copper alloy is preferable.
However, this precipitation-strengthened alumina dispersion strengthened copper alloy has a solution temperature (softening temperature) of 400 to 500 ° C. and is not satisfactory in arc resistance when used in the section where arcs are frequently generated. .
Similarly, a PHC train wire made of a precipitation-strengthened copper alloy in which Cr and Zr are added to copper has a solution temperature of about 400 to 500 ° C., and when used in the section section where arcs are frequently generated, The arc property is not satisfactory.

  This invention makes it a subject to improve the durability of the train line of the section part which may generate | occur | produce and wear or melt | disconnect by an arc under the said actual condition.

  In order to achieve the above object, the present invention uses an alumina dispersion strengthened copper produced by an internal oxidation method as a contact material for spot welding, etc., and the alumina dispersion strengthened copper is an oxide stable on the base copper. Since (alumina) is dispersed, solution formation is unlikely to occur, the strength is not lost even at very high temperatures, and the arc resistance is excellent. It was decided to use it for the train line of the section where there is a risk of fusing.

In the production of alumina dispersion strengthened copper by the internal oxidation method, first, copper (Cu) and aluminum (Al) are melted to produce a uniform alloy, and then the alloy is finely divided into copper and Al by an atomizing method or the like. An alloy powder is produced, and the alloy powder undergoes an oxidation process in which only Al in the copper matrix is oxidized to become alumina, and then a product (ingot) having a true density is formed by a powder metallurgy method such as an extrusion method. This product is turned into a train line by cold drawing, rolling, or the like.
Since this internal oxidation method can obtain a fine particle size, a narrow particle interval, and a uniform distribution state of alumina particles, it is possible to obtain alumina dispersion strengthened copper having excellent softening resistance.

This alumina dispersion-strengthened copper train wire has excellent softening resistance and high arc resistance (due to its high heat resistance temperature), so even if an arc is generated every time an electric vehicle passes through the section, conventional tin Compared to train wires made of copper alloy, stainless steel, etc., arc softening and wear are greatly reduced.
Also, even if an electric vehicle stops due to some reason in the air section of an overhead train line and an arc or the like continues to occur between the train line and the current collecting shoe, the current and time required to melt the train line Significantly longer (up).
Incidentally, the alumina dispersion strengthened copper has an alumina content of 0. Since it is as low as several percent by weight, there is an advantage that recycling is easy and the burden on the environment is small.

  The conductivity and heat resistant temperature of the alumina dispersion strengthened copper forming the rail line of the section may be set as appropriate according to the requirements for the conductivity and the like, for example, conductivity: 70% IACS or higher, heat resistant temperature: If it is 700 ° C. or higher, not only the conventional train wire made of tin and copper alloy, but also the precipitation-strengthened alumina dispersion strengthened copper alloy train wire and PHC train wire described in Patent Document 1, Excellent arc resistance.

As described above, the present invention uses an alumina dispersion strengthened copper manufactured by an internal oxidation method for a rail line of a section portion where an arc is frequently generated and may be worn out or melted. As a result, the durability of the train line in the section is improved, and the replacement time of the train line can be extended.
Also, even if an electric car stops in an air section or the like for some reason and an arc or the like continues to occur between the train line and the current collecting shoe, the current and time required to melt the train line are significantly increased. Therefore, since it is possible to ensure a long time for the treatment, it is possible to suppress the occurrence of a serious accident.

The section part of one Embodiment of this invention is shown, (a) is a top view, (b) is a front view FIG. 1B shows a cut side view of FIG. 1A, where FIG. 1A is aa line, FIG. 1B is bb line, FIG. 1C is cc line, FIG. 1D is dd line, and FIG. ) Is a cutaway view along the line ee. Sectional drawing of the principal part of an example of the electric vehicle track | truck which employ | adopted the section part of one Embodiment of this invention

This embodiment can be applied to, for example, the monorail shown in FIG. 3 and is a train line structure installed in a trapezoidal groove on both sides of the web outer surface of a track girder K on which the electric vehicle travels (paragraph 2 of Patent Document 2). 0027, see FIG. 3). The train line in FIG. 3 is a side current collecting type, and the current collecting shoe slides on the train line 11 from below to supply power.
In this train line section section 10, the train line 11 is arranged along the length direction of the track girder K, and the train line 11 is missing about 70 mm along the way (see FIG. 1A). The train line 11 is composed of an aluminum train line 11a and a stainless steel adjustment train line 11b up to the section 10, and both the train lines 11a and 11b are fastened and fixed together by bolts 11c. The adjustment train line 11b mainly bears sliding with the current collecting shoe, and the train line 11 can be updated by exchanging the adjustment train line 11b.

  The main guide plates 12 made of alumina dispersion-strengthened copper manufactured by an internal oxidation method such as shown in Table 1 below are continuously connected to the terminals of the train lines 11 and 11 facing the train line terminals 10a and 10a of the section 10 respectively. The auxiliary guide plates 13 and 14 made of the same alumina dispersion-strengthened copper are applied to both side surfaces of the main guide plate 12 and fastened by bolts and nuts 15. The terminal side of the auxiliary guide plates 13 and 14 on the side of the train line 11 becomes narrow pieces 13a and 14a, reach the side of the terminal web of the train line 11, and are fastened and fixed to the terminal by bolts and nuts 15 in the same manner. Further, one of the sub-guide plates 14 extends from the other sub-guide plate 13 to the opposite side, and a space between the both 13 and 14 serves as an insulating section S (see FIG. 1A).

The ends of both train lines 11 and 11 are connected and fixed by fastening and fixing both ends of a reinforced wooden connecting material 19 with bolts and nuts 20 via spacers 18. As shown in FIG. 2B, the top surface of the connecting member 19 is an inclined surface that extends from the center to both sides, and rain, snow, etc. fall without stopping.
Furthermore, both the train line terminal portions 10a and 10a have aluminum (A6063) side abutting plates 21 fastened to bolts and nuts 22 on both side surfaces of the end portion web of the train lines 11a and 11a.

The section portion 10 of this embodiment has the above configuration, and the alumina dispersion strengthening of tensile strength, elongation, electrical conductivity, and softening temperature shown in Table 1 below is applied to the guide plates 12, 13, and 14 forming part of the train line 11. When copper (Examples 1 and 2) is employed, even if arcs frequently occur on the guide plates 12, 13, and 14 (particularly between the guide plates 14 and 14), the guide plates 12, 13, and 14 It was not easily worn out. On the other hand, when the guide plates 12, 13, and 14 of the comparative example of Table 1 were employed, the service life was shorter than that of Examples 1 and 2.
Example 1: Alumina dispersion strengthened copper (trade name GLIDCOP (registered trademark) manufactured by North American Hogasus High Alloys LLC) manufactured by an internal oxidation method of 0.6% by weight, Example 2: 0.25% by weight Alumina dispersion-strengthened copper (same as above) produced by the internal oxidation method, and Comparative Example: 0.3 wt% Sn-Cu (GT-SN) In addition, each numerical value of a comparative example is the minimum standard value calculated | required in the train line 11 of 170 mm < ² > of cross-sectional area, and Example 1, 2 is also a case of a cross-sectional area: 170 mm < ² >.

In this embodiment, the alumina dispersion strengthened copper manufactured by the internal oxidation method is adopted for each of the guide plates 12, 13, and 14. However, the guide plate 12 or the guide plates 12 and 13 are not made of the same alumina dispersion strengthened copper and are inexpensive. It can be stainless steel or the like.
Further, although the embodiment is a case of a rigid train line structure, the present invention is not limited to the rigid train line, but can be applied to an overhead train line. In that case, an air section portion, an insulator section portion, Or, use the alumina dispersion-strengthened copper manufactured by the internal oxidation method on the part of the train line that has a high risk of wear or fusing, such as the dead section, for example, the section line of the section insulator or one span of the overhead pole. By adopting it, the operational effects of the present invention can be obtained.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

10 Train Line Sections 11, 11a, 11b Train Lines 12, 13, 14 Alumina dispersion strengthened copper guide plate S section to be a train line constituting the section

Claims (3)

  A train line section section, wherein the train lines (11, 12, 13, 14) in the section section (10) of the train line (11) are made of alumina dispersion strengthened copper manufactured by an internal oxidation method.   The train wire section portion according to claim 1, characterized in that the alumina dispersion strengthened copper of the train line (11, 12, 13, 14) has an electrical conductivity of 70% IACS or higher and a heat resistant temperature of 700 ° C or higher. .   The train line section according to claim 1 or 2, wherein the section (10) is an insulating section of a rigid train line.

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