机械行业周报：3月挖机内销同比+28.5% 建议关注自主可控、工程机械和机器人

Group 1 - The mechanical industry experienced a decline of 6.67% in the past week, ranking 27th among all primary industries [1] - Excavator domestic sales in March increased by 28.5% year-on-year, with a total of 19,517 units sold [1] - Major engineering machinery companies are actively repurchasing shares, indicating confidence in long-term performance [1] Group 2 - The semiconductor equipment sector is highlighted, with imports reaching $44.7 billion from the U.S., accounting for 10.1% of total imports [2] - High-end scientific instruments, particularly those from U.S. brands, show a high dependency on imports, prompting a push for domestic alternatives [2] Group 3 - The robotics industry is advancing, with notable developments in humanoid robots and partnerships in the intelligent technology sector [3] - The launch of open-source humanoid robots is expected to accelerate innovation and commercialization in the robotics field [3] Group 4 - Investment recommendations include companies in engineering machinery such as SANY Heavy Industry, XCMG, and LiuGong, as well as sectors like general machinery and humanoid robotics [4]