Title:
2ピースブーム式油圧ショベルの干渉防止装置
Document Type and Number:
Japanese Patent JP3759961
Kind Code:
B2
Abstract:
When an arm end moves beyond a border line (K2) and into a speed reducing area (R1), a solenoid proportional pressure reducing valve (13) is actuated to reduce a pilot pressure and a speed of a first boom cylinder (1A) to thereby reduce a speed of the arm end, and when the arm end moves beyond a border line (K1) and into a recovery area (R2), a control gain block (200) calculates a recovery gain in accordance with a distance over which the arm end moves into the recovery area, and respective functions (204, 205, 206, 207, 208, 209) calculate feedback gains in accordance with an arm end speed at that time. These gains cause a second boom (2) to automatically dump in accordance with a distance over which the arm end moves into the recovery area, and an arm end speed at that time, and move and return an arm end position to the speed reducing area. Accordingly, an operation for moving a working front toward this side is performed smoothly to improve a work efficiency.
Inventors:
Takahashi
Kazuhiro Sunamura
Yusuke Kajita
Kazuhiro Sunamura
Yusuke Kajita
Application Number:
JP53073798A
Publication Date:
March 29, 2006
Filing Date:
January 06, 1998
Export Citation:
Assignee:
Hitachi Construction Machinery Co., Ltd.
International Classes:
E02F3/43; E02F9/20; E02F9/22
Domestic Patent References:
| JP2308018A | ||||
| JP8333767A |
Attorney, Agent or Firm:
Kasuga Toshiaki