Initially excavator is manual, imported second-hand excavator Wheel, from discovery to 2013 has been one hundred and thirty years, experienced a period bucket rotary excavator driven by steam to electric drives and internal combustion engine driven rotary excavator, application progressive development of hydraulic integration of automatic hydraulic excavator. The first hydraulic excavator factory invented by the French Poclain success. Because the application of hydraulic technology, in the 1940s on a tractor equipped with a hydraulic backhoe excavators suspended. In 1951, the first fully hydraulic backhoe made in France Poclain (Poquelin) factory launch, Hainan imported second-hand digging machine, so that in the area of ??technological development excavators creating a new space, and early 1950s We have developed a mid-drag full-swing hydraulic excavators and crawler hydraulic excavator whole. Early trial is the use of aircraft hydraulic excavator and machine tool hydraulic technology, components for hydraulic excavators lack of a variety of conditions, the manufacturing quality is not stable enough, parts are not complete. Since the 1960s, the hydraulic excavator into the promotion and vigorous stage of development, countries excavator factory and varieties increased rapidly, production soared. 1968--1970 years, excavator hydraulic excavator production accounted for 83% of total production, import of used digging machine prices, already close to 100%. Preparations before welding repair method: hand wheel weld crack at the original oil, paint and rust cleaned. By gouging machine will weld crack plane cut out, cut to the body side of the plane, and the cleaned base material hardened conventional welding area. After cutting plane with the angle wheel will cut polished smooth (inside interfaces polished V-shaped groove), cleaning, pink check to make sure all cracks have been found and removed. Heilongjiang imported second-hand excavator | Used excavator Kim Ho | import of used wheeled excavator by Shanghai Used Construction Machinery Co., Ltd. Jin Hao. Heilongjiang imported second-hand excavator | Used excavator Kim Ho | import of used wheeled excavator is Shanghai Jin Hao Used Construction Machinery Co. (www.jinhaosh.cn) this year introduced a new upgrade, the above picture is for reference only, please call this page or Tel picture on to obtain the latest information, contact: Mr. Chairman.