The development of grab of foreign large hydraulic pressure about from on 70 time begin the century. If Japanese day stands,build aircraft company to be in 1972-1976 year an UH12 of development shovelling grab of large hydraulic pressure, its fight a capacity to be 2.2m³ , working weight 36t; UH20 fight capacity 3.2m³ , working weight 50t; UH30 fight capacity 4.4m³ , working weight 75t. 1979, day stands built machine success to develop UH50 model shovelling exceed grab of large hydraulic pressure, fight a capacity to amount to 8.2m³ , working weight 175t. Through 30 old development, the weight of the biggest job that exceeds grab of large hydraulic pressure at present already broke through 900t class, bucket fights a look to amount to 50m³ . Because have a structure compact, operation convenient, motion is reached neatly easily the advantage such as care and maintenance, exceed grab of large hydraulic pressure to already was formed replace tightwire mechanical or electric grab stage by stage (common weighs power shovel) trend.

Exceed grab of large hydraulic pressure to basically be used at the exploitation of mine of all sorts of large-scale open air and large base construction, return the Yu Tianhai that be used to build ground project and project of harbour wadi dredge at the same time, shovelling type grab to occupy much among them. At present production exceeds the manufacturer of large grab to basically distributing to wait for project machine to produce power in the United States, Japan, Germany, those of advantageous Bohaier, card spy forces well-known manufacturing company, day stands, small pine, Teleikesi (O&K) wait for a company.

1987, the world's biggest at that time day establishs EX3500 model shovelling exceed large grab (fight capacity 18.8m³ , working weight 330t) the success is developed in Japan, developed a bottle of capacity 22m³ again in this year, the EX4200 of working weight 420t shovelling exceed large grab. Right now world other company also develops manufacturing favorable balance of trade in succession grab of large hydraulic pressure, like small loose PC1600 model, those straps Carter 5130 model, r992 of Er of benefit suddenly sea, R994, teleikesi (O&K) RH20C, RH90C wait.

After 1990, exceed a bottle of capacity of grab of large hydraulic pressure to increase ceaselessly, achieved 50m³ above; Chance is serious increase ceaselessly, amount to 800t above, had formed at present super- large mine with series of grab of cubic meter of earth hydraulic pressure.

Day stands build machine the EX8000 that faces mine user at successful 2004 research and development exceeds grab of large hydraulic pressure, bucket capacity is 40m³ , be equivalent to 6 capacities of 11 tons of tip lorry about, 780t of weight of the biggest job, it is the hydraulic pressure grab of the biggest level that at present Japan produces. Should exceed grab of large hydraulic pressure to be able to comply with the current that carry cost to reduce excavate and increases load of mine dump car ceaselessly not only, and as dynamoelectric as tightwire type grab is compared, the machine motive with exceed grab of large hydraulic pressure to have better and operation sex, reducing operation cost respect to also have an advantage extremely. Up to now, day stands build aircraft company to had waited for large mine consign to North America, Australia, Asia and south Africa of a variety of about 700 model exceed grab of large hydraulic pressure, the market share with the largest whole world was held in this level.
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