Overview of domestic and foreign large hydraulic excavators and Prospects - excavator, development survey - machine tool industry

Overview of domestic and foreign large hydraulic excavators and Prospects - excavator

, development survey - machine tool industry

Large hydraulic excavator development abroad about 70 years from the last century began. Such as Japan's Hitachi Construction Machinery Corporation in the development of UH12 between 1972-1976 type shovel large hydraulic excavators, the fighting capacity of 2.2m , working weight 36t; UH20 Bucket capacity 3.2m , working weight 50t; UH30 Bucket Capacity 4.4m , working weight 75t. In 1979, Hitachi Construction Machinery has developed a UH50 large hydraulic shovel type excavator, bucket capacity of 8.2m , working weight 175t. After 30 years of development, large hydraulic excavator has exceeded the maximum operating weight of 900t class, and bucket capacity up to 50m . With compact structure, easy operation, exercise flexibility and the advantages of easy maintenance, large hydraulic excavator has become increasingly replace mechanical or electrical cable excavator (commonly known as shovel) trend.

Large hydraulic excavators used a variety of large-scale open pit mine in the mining and large infrastructure, while also used in land reclamation works and the harbor channel dredging project, which now account for most of the excavators. Manufacturers currently producing large excavators are mainly distributed in the United States, Japan, Germany and other engineering machinery manufacturing power, the famous manufacturing enterprises Liebherr Caterpillar, Hitachi, Komatsu, Terex (O & K) and others.

1987, when the world's largest shovel Hitachi EX3500-type large excavator (bucket capacity 18.8m , working weight 330t) developed in Japan, and in this year developed the bucket capacity of 22m , the weight of work 420t of the EX4200-type shovel large excavator. At this time other companies have developed the world's production of large hydraulic excavators, such as Komatsu PC1600-type, type 5130 Caterpillar, Liebherr R992 type, R994 type, Terex (O & K) RH20C type, RH90C type and so on.

1990 onwards, large hydraulic excavator bucket capacity increased, reaching more than 50m ; machine weight continued to increase, reaching more than 800t and has now established large mining and earth-type hydraulic excavator series. Hitachi Construction Machinery

successfully developed in 2004 for mining large hydraulic excavator EX8000 users, bucket capacity of 40m , roughly equivalent to six dump trucks of 11 tons capacity, maximum operating weight of 780t, is currently in Japan made the greatest level of hydraulic excavators. The large hydraulic excavator can not only follow in order to reduce transportation costs continue to increase extractive mining dump truck load of trends, but with cable compared to electric excavators, large hydraulic excavator machines with better motivation and operational in lower operating costs are a strong competitive advantage. So far, Hitachi Construction Machinery Company has been to North America, Australia, Asia and South Africa to deliver large-scale mine about 700 various types of large hydraulic excavator, to occupy the level of the world's largest market share.

Large hydraulic excavator driven by the rapid development and application of its good performance and durability, reliability, greatly improved excavator productivity and economic benefits.

Superior control performance is controlled and large hydraulic excavators operating a notable feature. Large hydraulic excavator engine? Pump electrical control system, you can maximize engine performance and reduce fuel consumption, so that mechanical work effectively. Most large excavator fault detection system installed in the cab of the display using the driver provided for the major components, systems and working conditions of machine, machinery automation and adaptability greatly increased. In addition, large hydraulic excavator working device has also been greatly improved, in the struggle between the bar and the bucket body with a parallel expansion to increase the scope of work bucket, operating performance improvement. In order to observe a large dump truck driver easy loading and unloading conditions, many large excavator cab forward before the window of the form used to make a good view of observation.

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