| 摘要 |
PROBLEM TO BE SOLVED: To provide an accurate over-loading prevent device by using a non-contact boom tip position detection means. SOLUTION: This over-loading prevent device comprises the non-contact boom tip position detection means 40 detecting, at non-contact, a boom tip position 27 relative to a swing table 23 and an actual load detection means 1 detecting an actual load acting on a boom 24. The device also comprises a calculation part 37 having a boom allowable load storage means 36 storing a boom allowable load allowed to act on the boom tip 27, a limit load calculation means 7 reading the boom allowable load from the boom allowable load storage means 36 based on signals from the non-contact boom tip position detection means 40 and calculating a limit load allowed to act on the boom, and a comparison means 9 comparing the actual load detected by the actual load detection means 1 with a limit load calculated by the limit load calculation means 7 and outputting a limit signal when a specified relation is obtained therebetween and a restricting means 11 restricting the boom-related operations with restriction signals from the calculation part 37. COPYRIGHT: (C)2006,JPO&NCIPI
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