| 摘要 |
PURPOSE:To correct backward inclination of a bucket and to prevent dropping of sand, by a method wherein the backward inclining angle of a bucket along with raising of a lift arm is detected, and the oil chamber on the lowering side of the lift arm is communicated with the oil chamber on the forward inclination side of a damp cylinder. CONSTITUTION:A lift arm 3 is vertically rockably secured to a support frame 2 of a car body 1 of a shovel loader, and a bucket 8 is vertically movably secured to the forward end of the arm 3. A detection switch 29 for backward inclination of the bucket 8 is located in the vicinity of a pivotally-securing point 4 of the arm 3, and a link 24 extending along the arm 3 is coupled to the bucket 8 to transfer inclination of the bucket 8. An electromagnetic switching valve 36, with the aid of which an oil chamber 7a on the lowering side of a lift cylinder 7 is communicated to the oil changer 13a side of a damp cylinder 13 when the bucket 8 is inclined to a given backward inclining angle, is located between the oil chambers on the forward and backward inclination sides of the lift cylinder 7a and the damp cylinder 13. This enables automatic prevention of dropping of sand. |
