Regeneration function implementing device for bucket arm of hydraulic excavator

The present invention provides a hydraulic excavator boom reproducing function realizing means, characterized by comprising: a first three-way valve which is turned left bit first oil passage and the small chamber of the arm cylinder, which guide right position arm cylinder through the small chamber and the oil tank; second three-way valve, which is turned-left small chamber of the arm cylinder and the regeneration check valve, the check valve connected to the regeneration the large chamber of the arm cylinder, which guide right position through the second oil supply passage and the small chamber of the arm cylinder; the third three-way valve which is turned left bit first oil passage and the large chamber of the arm cylinder, is turned to the right position the large chamber of the arm cylinder and the tank ; fourth three-way valve, which is left turned-arm cylinder chamber and a large fuel tank, is turned to the right position and the second oil supply passage large chamber of the arm cylinder. The present invention simplifies the hydraulic circuit, to save processing costs and large adjustment range.