摘要 |
PROBLEM TO BE SOLVED: To provide a shield machine capable of controlling stroke of two hydraulic jacks for driving a beam cutter accurately. SOLUTION: In this shield machine, stroke set values of the first and second hydraulic jacks 40a, 40b are decided based on rotation angles of a cutter frame 8 detected by a rotation angle detection means 53, respectively, opening degrees of first control valves 48a, 50a are controlled to make deviation of a stroke detected value of the first hydraulic jack 40a detected by a first stroke detection means 54a from the stroke set value of the first hydraulic jack 40a zero, and opening degrees of second control valves 48b, 50b are controlled to make deviation of a stroke detected value of the second hydraulic jack 40b detected by a second stroke detection means 54b from the stroke set value of the second hydraulic jack 40b zero. COPYRIGHT: (C)2009,JPO&INPIT |