Many bridge cranes are equipped with corresponding rails, which are usually made of steel. They are limited in length and need to be connected by two or two. Their function is to facilitate the movement of the whole machine or the trolley. It also has a separate name called a track joint.
There are many heavy fittings in the rail connection, such as bolts, nuts, spring washers, etc., and a splint. This is more important. Rail joints are required to be welded. If the crane rails are not welded, danger may occur during use. Of course, bolt fastening is also essential.
In general, we need to deal with the rail joints in order to allow the crane or the lifting trolley to encounter a smooth slip transition when passing through the track, and these technical requirements I will list below:
1.of course, it is an international standard, that is, it must comply with the requirements of relevant national standards;
2. it is to consider the influence of thermal expansion and contraction of the rail. After welding, there is a need for a gap. The size should be controlled within the range of 15-18mm, and it should not be less than 12mm;
3. the order of welding, first of all must first weld the bottom of the rail, then the welded rail waist, and finally the rail head. Therefore, the welding method is to layer-by-layer surfacing, and finally around the repair process. (It should be noted that in the case of surfacing, the adjacent end portions of the two rails should be preheated by the same length at the same time);
4. heat treatment is of course necessary after welding. Finally, some grinding work is done, as long as the track joints are consistent with the track as a whole, smooth and uniform.
