Once the diagonal difference of the bridge frame of the bridge crane exceeds the range, it will directly cause the horizontal deflection of the wheels, and the rail gnawing will occur after the crane is running.
In order to make the bridge diagonal of the bridge crane back to normal, it must be corrected. The first thing to do is to determine the size of the diagonal difference; then use the puller to match the flame correction.
In this process, the heating position should be controlled well, and it should be at the connection between the main beam and the end beam of the bridge with a small diagonal. The heating area is also determined according to the actual correction amount, and the heating direction is generally from the upper and lower ends to the middle for heating, which is convenient to obtain the ideal correction effect.
In the case of improper hoisting or collision, the main girder of the bridge crane will bend inwards. This is a partial bending, which usually has collision marks, and the upper and lower cover plates are bent inward. The degree is also different.
One of the effective ways to deal with this kind of side bend problem is correction, which can be carried out at the same time as correcting the downward deflection of the main beam. , So that the side bending deformation can return to normal.
In addition to bending inwards, the main girder of bridge cranes also bends outwards. This number is caused by improper storage, improper storage or collisions. If it is not serious, there is no need for special correction. After use, it will gradually move inward.
However, if the main beam has a relatively large external deflection, the general method cannot obtain a better correction effect. It is still necessary to cut off the tread plate of the external convexity before the fire, and then use a pull tool or a manual hoist and The main beam can be straightened only by matching the flame correction.