Safety wire contact steel-aluminum composite track and 5 kinds of accessories
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Safety wire contacts Steel-aluminum composite contact rails Common connectors are suitable for fixed connection of adjacent contact rails and conduction of current. The connecting holes of the composite rail and the fish plate have a minimum tolerance, so that in the mutual cooperation it can be ensured that there is little or almost no mutual movement. The joints of the contact rails are required to be flush with each other to ensure that the bare stainless steel belts are installed flush with one side, and that unevenness or torsion is not allowed. The installation accuracy is 0.5 mm.
The expansion joint is designed so that it can adapt to thermal expansion and contraction caused by changes in ambient temperature, current-induced temperature rise, sunlight, and movement of the composite rail. The expansion joint assembly requires alignment with the contact surface between the adjacent rails to ensure that the train is smoothly passed by the electric shoe. The safety wire contact expansion joint is 1975mm long. In the straight section, the expansion joint should be installed in the center of the two bracket devices. The distance of each end of the least expansion joint from the bracket device should not be less than 400mm.
If expansion joints are provided in the curve section, the insulating bracket and the expansion joint will be subjected to a great tension. The sliding block of the expansion joint accelerates wear due to this extra tension and the insulating bracket wears out very quickly. Therefore, expansion joints are generally not provided at the bends. In special cases, there will also be cases where the bends with radius less than 300m must be provided with expansion joints. At this time, the expansion joints can still play a role, but the tension transfer of the expansion joints can be opened and closed to act on the insulating support. Given the distance between anchorages, this should be taken seriously.
In addition to connecting two independent steel-aluminum composite rails, the intermediate connector for safety trolley wires is also used to introduce external current into the contact rail. The installation effect is as shown in the figure below. Each intermediate connector can connect 8 to 12 240mm2 wires. The wire must have sufficient headroom to avoid applying additional force to the composite rail, thereby impeding longitudinal movement of the composite rail.
There are two types of elbows at the end of the safe trolley line according to the main line and the yard line. The length of the main elbow is 5.2m, the height difference between the ends of the elbow at the end is 126mm, and the elbow length of the yard is 3.4m. The height difference between the two ends of the head is 129mm, and an ordinary joint is used between the end elbow and the contact track. Its purpose is to ensure that the electric shoe can smoothly contact and disengage from the composite track when the train is running at rated speed.
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