The I-beam wheels of the LD electric single girder crane are severely worn, with a lifting capacity of 10 tons, a span of 22.5m, a working level of A3, and ground walking operations. The wear of the I beam has reached a quarter of the total thickness. After on-site inspection, although it does not meet the scrap standard, it must be stopped immediately and repaired. The total length is 1.2 meters. During the start and stop process of a single beam crane, due to the friction between the wheels and the I-beam, a fixed position is generally used. Therefore, the car slipped badly when it got here.
It is relatively simple to repair the wear and tear of I-beam. If there is no wear in the future, the problem must be solved fundamentally. The traditional single-girder crane only needs to be lifted once to reach the set speed. Under a large impact, the friction between the wheel and the I-beam increases, which accelerates the wear of the I-beam. Therefore, we plan to level the worn parts of the I-beam and use a 6mm thick steel plate to strengthen the lower edge. A frequency converter is added to the electronic control to control the speed of the vehicle by changing the frequency of the current. It can make the car accelerate slowly when starting, and reduce the friction between the wheels and the I-beam.
I-beams are seriously worn and easily cause safety accidents. If wear is found, it should be repaired in time. Electric single-beam crane with a lifting capacity of 10 tons and a span of 30 meters. The hoist track of the electric vehicle has been used for about 3 years, and the wear is serious. If it continues to be used, there are potential safety risks. It must be scrapped and the crane must be purchased again.
According to the site usage and environmental investigation, it was found that the single beam crane was frequently used, and the workpiece was frequently lifted, and the cargo was lifted close to the rated capacity. The overall work level has exceeded the level range of the electric single-beam crane. In addition to annual inspections, electric single-beam cranes are more suitable for double-beam cranes.
Double beam cranes are more stable than single-beam cranes. The characteristic of a single-span crane is that the span is generally not too large. Generally, the recommended height should not exceed 22.5 meters. When the span is too large, the height of the main beam box girder increases rapidly, and the main problem is that its horizontal rigidity is difficult to meet the requirements. Single-girder cranes often shake in the horizontal direction during the opening process, causing harm to the structure, and there are potential safety hazards in long-term use. In addition, due to the large span, according to national standards, the arching is also large, and the electric hoist needs to climb a long slope during the walking process, which will also easily cause slides and wear. The frequency conversion speed regulation system can effectively improve the impact and anti-skid ability of the walking mechanism, thereby improving the working level and span of the single-beam crane.
The double beam crane has two main beams, and an overhaul walking platform is provided on the side of the main beam. Therefore, the horizontal rigidity is not a problem. The selection level of the double-beam crane motor, reducer and other accessories is higher than that of the single-beam crane. Therefore, the double-beam crane can complete higher-level tasks.
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