To provide an interference prevention device of a working machine capable of surely preventing a cab liftably installed on a machine body from being interfered with the attachment of the working machine.
A controller 64 sets an interference prevention area A on a coordinate so as to cover the all movement area of the cab 13 formed liftably, and calculates the coordinate of a part B to be monitored from information on boom angle sensor 62, a stick angle sensor 63, and the maximum diameter of an attachment 28. Solenoid proportional valves 66 as pilot pressure stop valves are installed in a pilot line 48bu for boom up and a pilot line 48si for stick-in. The solenoid proportional valve 66 has a function to eliminate a pilot pressure signal for boom raising and a pilot pressure signal for stick-in to a control valve 42 by a pilot pressure stop signal output from the controller 64 according to a determination that the part B to be monitored reaches the interference prevention area A.
HIBI YOSHIYUKI
TOKUDA SHUJI
| JPH0835239A | 1996-02-06 | |||
| JPH09256416A | 1997-09-30 |
| WO1998030759A1 | 1998-07-16 |
Satoshi Kabazawa
Tetsuya Yamada