JPS6044164B2 - Tension installation type insulated trolley wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a contact wire for supplying power to a moving load, particularly a tension-laid insulated trolley wire laid in a cold atmosphere.

Conventionally, bare trolley wires have been widely used for supplying power to transportation equipment such as cranes and hoists, as well as moving bodies powered by electricity, but because they are installed under tension, there are problems with fusing due to sparks that occur when collecting current, and A contact electric shock accident occurred.

In recent years, in view of this, insulated trolley wires have been developed and put into practical use.

In other words, an insulated trolley wire is constructed by covering a long molded conductor with an insulating cover having a substantially U-shaped cross section, and is usually laid as a long object by drum winding, coil winding, etc. The conductor is delivered to the site, the length is selected according to the length of the cable to be installed, and the length is selected and rolled out. Both ends of the conductor are connected to the bracket and laid under tension, while the insulating cover is left under no tension and fixed with a hanger to the specified collection. It provides the electrical parts.

By doing this, the insulating cover can prevent falling due to electric shock or melting, and it also has many features, such as a significant reduction in installation work, and since there are no connections, there is no need to worry about sparks. It is something. by the way,
When used in cold atmospheric conditions, the current collecting part of the conductor becomes frosted and iced, making it impossible to collect current, so heating or other means is required.For this reason, it is necessary to incorporate a heating wire. Yes, it is expensive and complicated.

The present invention has been made in view of the above circumstances, and aims to provide an insulated trolley wire that can be heated and installed under tension without incorporating a separate heating wire. An insulating layer is formed around stranded wires mainly made of metal with high tensile strength and high electrical resistance, and a highly conductive metal strip is vertically coated around the insulating layer, and on top of this, a highly conductive metal strip is vertically covered. The present invention provides a tension-laid type insulated trolley wire, characterized in that a substantially U-shaped insulating cover is formed so as to expose a part of the metal strip.

In the above, the stranded wire is mainly made of steel stranded wire, and if necessary, one coated with zinc, copper, aluminum or the like or mixed with copper or aluminum bare wire is used.

The material for the insulating layer is preferably a heat-resistant rubber or plastic material that can withstand heating, and the insulating cover is preferably a hard vinyl chloride material. Furthermore, copper material is suitable for the metal strip because it has wear resistance.

The following will be explained with reference to the drawings. Fig. 1 shows an embodiment of the insulated trolley wire of the present invention, in which 1 is a steel stranded wire, and 2 is a coating formed on the periphery of the stranded wire 1 by extrusion or tape winding. 3 is a copper strip coated vertically on the insulating layer 2 by means such as roll forming; 4 is an insulating cover made of vinyl material or the like and having a substantially U-shaped cross section; The strip 3 is coated by extrusion molding or the like,
The copper strip 3 is exposed in the opening 4a of the cover 4 to form a sliding surface for the current collector.

Since the present invention is constructed as described above, the insulating layer 2 is
The strip body 3 can be heated through.

The installation method of the present invention involves winding the long insulated trolley wire into a drum, winding it into a coil, and transporting it to the site, feeding out and cutting the desired length in accordance with the installation route, and stripping the ends. Both ends of the steel stranded wire 1 are connected to a fixing bracket via an insulator or the like and placed under tension, and the insulating cover 4 is suspended and fixed at a predetermined position using a hanger.

One end or both ends of the stranded wire may be suspended from a bracket via a coil spring or the like, if necessary. ) and used by separately supplying power to the untensioned copper strip 3 and the tension stranded wire 1. It is something that can be done.

FIG. 2 shows an example of the circuit, and shows a three-phase, three-wire type that is stretched by brackets 5, 5, and each strip 3R, 3S,
3T is connected to the 3-phase power supply Q1, and each twisted wire 1R, 1S
, 1T is simple by connecting each! It is formed by connecting the phase power supply Q2, and 2R, 2S, and 2T indicate insulating layers.

Note that it is preferable to attach a temperature measuring element to the surface of the insulated trolley wire as necessary, and thereby control the temperature to a constant temperature by turning the power supply ON and OFF.

The stranded steel wire 1 has a high resistance value and is suitable for heating purposes, but if the length of the wire is long, the resistance will be very high, so it is necessary to adjust the resistance to an appropriate level.

In this case, it is better to incorporate a single wire made of aluminum or copper into a part of the stranded steel wire, or to use aluminum or copper coated wire.

According to the insulated trolley wire of the present invention, which is constructed as described above, it is possible to install the wire under tension and heat it with electricity without incorporating a heating wire. It is possible to solve problems such as wire breakage in this type of trolley wire at once, and it is economical.

In addition, heat can be generated from the center of the strip, and the heating efficiency is very good. Furthermore, since the strip covers the stranded wires vertically with no tension through the insulating layer, relative movement in the longitudinal direction with the stranded wires can be achieved by frictional sliding contact of the insulating layer. .

Therefore, even if there is a difference in thermal expansion/contraction behavior between the strip and the stranded wire, the strip can be freely expanded and contracted in its longitudinal direction without causing any problems, thereby eliminating strain on the sliding parts of the strip. This is a high-performance heated insulated trolley wire, and its effects are enormous.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the insulated trolley wire of the present invention, A is a sectional view, B is a side view, and FIG. 2 is an explanatory view showing an example of use of the insulated trolley wire. 1, 1R, 1S, 1T: Steel stranded wire, 2, 2R, 2S, 2T
: Insulating layer, 3, 3R, 3S, 3T: Copper strip, 4: Insulating cover.

Claims (1)

[Claims] 1. An insulating layer is formed around stranded wires mainly made of metal with high tensile strength and high electrical resistance, and a highly conductive metal strip is vertically coated around the insulating layer, and on this A tension-laid type insulated trolley wire characterized by a substantially U-shaped insulating cover formed so as to expose a part of the metal strip.