| 摘要 |
PROBLEM TO BE SOLVED: To provide a boom vibration control device that prevents a boom from coming into contact with the ground when the left and right weight balance of the boom collapses.SOLUTION: A boom vibration control device 7 for inhibiting the vibration of a boom 6 includes: a fluid pressure cylinder 71 connected with a work vehicle 1 and the boom 6, and telescopically operating in conjunction with the boom 6 turning in a rolling direction of the work vehicle 1; a first accumulator 77 for pressurizing one hand compartment 75 of the fluid pressure cylinder 71, and enabling a working fluid to come in and out through a first passage 79 with the telescopic operation of the fluid pressure cylinder 71; a second accumulator 78 for pressurizing the other compartment 76 of the fluid pressure cylinder 71, and enabling the working fluid to come in and out through a second passage 80 with the telescopic operation of the fluid pressure cylinder 71; and circuit breakers 83, 84 for cutting off the first passage 79 and cutting off the second passage 80 when at least one of a right boom 61 and a left boom 62 is not present in a working position expanded in a lateral direction of the work vehicle 1. |
