Technical guidance for reinforcement and maintenan

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Technical guidance for reinforcement and maintenance of crane structural parts

with the continuous increase in the crane market and its wider application, crane repair issues, especially those related to the repair or reinforcement of structural parts, have attracted more and more attention. The following is an example of Qinhuangdao special equipment supervision and Inspection Institute inspecting the chassis structural parts of a port v133t crane reinforced at the beginning of 2007

the reinforcement effect of the mechanism is mainly determined by the reinforcement scheme, the quality of wood plastic instead of traditional wood, welding process and strength inspection

in terms of the reinforcement scheme, according to the specific stress conditions and stress concentration characteristics of the chassis:

the chassis is a beam structure, mainly subject to bending stress, and the stress is concentrated at the position where the far end of the outrigger is combined with the center rotation, and the cross section of the chassis is a box structure. According to these actual conditions and in combination with the construction requirements, we decided to adopt the scheme of attaching opposite plates and transverse plates respectively for reinforcement, and welding the two attaching plates into one with a cable-stayed plate. In this way, the three plates form a stable tripod. The established goal of the R & D activities is to reduce the weight of the existing automobile body by half. Through theoretical calculation, the strength is increased by more than 15%, meeting the actual use requirements

in terms of the selected materials, we first identify the base metal, analyze the content of main chemical elements and various mechanical property parameters, and require the selected materials: the chemical composition is close to the base metal to ensure the welding effect; The mechanical properties exceed the base metal to ensure the strength requirements. After the new material is selected, the base metal and the new material are sampled and welded together for damage test. The result shows that the base metal is broken, indicating that the strength of the new material and the welding part is greater than that of the base metal, ensuring the construction quality and strength requirements

in terms of welding process, we mainly require from six aspects: parent body cleaning and preheating, welding rod drying, processing reinforcing plate, welding machine, welding construction procedure and post welding insulation, so as to ensure the construction quality

in terms of strength inspection, clearing machine table and table top inspection, it is mainly to check that all welds and the recently acquired Austrian company mold matic and the Dutch Bosch sprang joint shall be free of missing welding and burning through, and the welds shall be free of cracks and incomplete fusion defects. The main board shall be welded as grade I welds, and the reinforced part shall be welded as grade II welds. The weld bead shall be inspected for welding defects (NDT). After the welds meet the above four requirements, the whole vehicle shall be subject to hoisting test, and the structural parts shall be subject to stress test. The percentage of strength increase of chassis structural parts shall be determined according to the test strain method, and then compared with the actual requirement of 15%, so as to draw a conclusion whether the construction is qualified

structural member reinforcement is an engineering project with high requirements and heavy responsibilities. Management and supervision must be strengthened in all links to ensure that nothing is wrong

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