Nowadays, crane equipment is a common equipment for loading and unloading, which is used when manpower cannot do it, that is to say, crane is a good helper for people, which is very important in work and life and promotes the development of national economy. Port cranes promote port economy and trade, and sometimes need reinforcement to prolong service life and improve performance.

Reinforcement scheme

The chassis is a beam-type structure, which is mainly subjected to bending stress, and the stress is concentrated at the joint between the far end of the leg and the rotation, and the cross section of the chassis is a box-type structure. According to these actual conditions, combined with the construction requirements, we decided to adopt the scheme of strengthening the opposite plate and the transverse plate respectively, and welding the two plates into a whole with a diagonal plate. In this way, the three plates form a stable tripod structure, and through theoretical calculation, the strength is increased by more than 15%, which meets the actual use requirements.

Material quality

The material is close to that of crane to ensure the welding effect, and the performance of the material should meet the strength requirements. After selecting good materials, the parent metal and the new material were sampled separately and then welded together, and the failure test was carried out. The results showed that the strength of the new material and the welded part was greater than that of the parent metal, which ensured the construction quality and strength requirements.

welding technology

It is mainly required from six aspects, such as cleaning and preheating, electrode drying, reinforcing plate processing, welding machine, welding construction procedure and post-welding heat preservation, so as to ensure the construction quality.

Strength test

Check whether the welded parts have the phenomenon of missing welding and burning through, and whether they meet the use requirements. After reinforcement, the structural parts should be inspected to judge the percentage of strength improvement of chassis structural parts, and then compare with the actual requirement of 15%, so as to draw the conclusion whether the construction is qualified or not.