工程机械板块2月3日涨6.35%，建设机械领涨，主力资金净流入12.83亿元

Group 1 - The engineering machinery sector experienced a significant increase of 6.35% on February 3, with construction machinery leading the gains [1] - The Shanghai Composite Index closed at 4067.74, up 1.29%, while the Shenzhen Component Index closed at 14127.1, up 2.19% [1] - Key stocks in the engineering machinery sector showed notable price increases, with Construction Machinery rising by 9.95% to a closing price of 4.53 [1] Group 2 - The main capital inflow in the engineering machinery sector was 1.283 billion yuan, while retail investors saw a net outflow of 817 million yuan [2] - Major stocks such as Sany Heavy Industry and Zoomlion received significant net inflows from institutional investors, with Sany Heavy Industry attracting 675 million yuan [3] - The overall trading volume for the engineering machinery sector was substantial, with individual stocks like Zoomlion and Sany Heavy Industry contributing significantly to the total turnover [1][2]