AUTOMATIC EXCAVATING METHOD FOR HYDRAULIC SHOVEL

PROBLEM TO BE SOLVED: To facilitate the throw-in of sediment from a hydraulic shovel set on a high table by, after the hydraulic shovel is set on the high table and a downward excavation start position is instructed, extending and contracting a working machine on a program, and detecting the excavated quantity, and pulling in an arm according to the excavated quantity. SOLUTION: Working apparatus such as a boom 14, an arm 15 and a basket 16 are provided on a turning table 13 attached to a car body 12. A command for moving the working machine is output to driving means according to signals sent from a position sensor and a turning position sensor and a stored program to oscillate the working machine for automatically carry out excavation and mud discharge. Thus, after an excavation start position for a sediment lower than the high table 1 is instructed, the working machine is automatically extended and contracted by the program, and an excavated quantity is detected, and the arm is pulled in according to the excavated quantity. Since an operator may be given only the teaching of the initial excavating position, even an unskilled operator may be satisfactory, and the teaching becomes easy.