The United States is the third largest manufacturer of engineering machinery in the world, with its headquarters in the West Port of Connecticut, the United States, with 5 departments under its flag, 9 production bases around the world, with more than 21000 employees and $9 billion 200 million in 2007. Crane is its second largest business, accounting for 30% of its total revenue. In 1918, tyre designed the first tire crane. Since then, the 名媛直播 involve telescopic arms, crawler and tower cranes. In May 2002, the crane group acquired the crane business of Demag, Germany. In 2006, he bought 50% of Sichuan Changjiang crane. At present, there are 4 joint ventures and 3 wholly owned enterprises in China.
Demag can produce 30-1000 tons of all terrain cranes and 50-3200 tons of CC crawler cranes. The CC8800 1250 ton crawler crane, launched in 2002, is the world's first commercial type 1000 ton crawler crane. Modular design is adopted in the structure, with compact size, convenient assembly and disassembly, and can be transported quickly on expressways. The type was later upgraded to CC8800-1 1600 ton crawler crane. The Trex CC12600 crawler crane, launched in 2006, has a maximum lifting capacity of 1600 tons, a working radius of 8 meters, and a Daimler Chrysler OM 442 LA (405 kW) engine with a length of 54-114 meters in the main arm and 42-120 meters in length for the fixed arm.
At the end of 2007, Trex sold the first CC8800-1 TWIN crawler crane with 20 million euros, with a maximum lifting capacity of 3200 tons, a working radius of 8 meters, and a maximum lifting torque of 44000 tons. This is the largest crawler crane in the world. The machine is essentially a double boom crane consisting of two 1600 ton CC8800-1 hoists. The weight is 1740 tons in super state. In April 2, 2008, Zhongyuan construction company of China nuclear industry construction group ordered a CC8800-1 TWIN type 3200 ton crawler crane, which was used for construction of Haiyang nuclear power station in Shandong. The contract amount exceeded 200 million yuan.
The United States, in 1902, was located in the city of Wisconsin, Wisconsin, a shipyard, and is now the world's largest manufacturer of mobile cranes. In 1925, the first trussed trussed crawler crane, which was used as a self - used factory, had been involved in the 名媛直播 of ship cranes and wheeled cranes, including National, and other brands. In 2001, it bought the world's largest tower crane company, POTAIN, a crane company in France. In 2002, Grof, the famous crane manufacturer of all terrain, was put in the pocket of Grove. In 2005, it invested 30 million US dollars to build a large tower crane plant in Zhangjiagang, Jiangsu. In 2008, the sales revenue of the group amounted to $3 billion 883 million.
The crawler crane manufactured by Mani Tova J has 13 models, with a tonnage of 45-1300 tons. To a certain extent, its 名媛直播 reflect the design style of the United States. The famous M21000 crawler crane has a weight of 1000 tons (907 tons), which has a very low center of gravity and a unique 4 sets of 8 crawler walking devices. In February 2006, Sinopec Shandong ten built a crawler crane. The Mani Tova J 1300 ton M1200 crawler crane has a ring track device. The ring rail is located at the periphery of the crane running mechanism, which improves the stability of the whole machine. But the construction of the ring rail has increased the cost, and the crane can not carry the load in use. The model of the same level non loop rail device is type M2250. The M31000 type is being developed, with the maximum weight of 2300 tons, the length of the main arm 55-105 meters, the fixed arm length 24-42 meters long, the same 4 set of crawler walking devices, with variable position weight device, can be automatically unfolded during the hoisting process.
