| 摘要 |
<p>A conveyance vehicle is provided with hoist cylinders (14) which cause a vessel (3) to pivot and which are provided between a vehicle body (2) and the vessel (3); and first and second directional control valves (24, 25) which control the supply and discharge of pressurized oil to and from the hoist cylinders (14). The first and second directional control valves (24, 25) have neutral positions, raising positions at which the vessel (3) is caused to pivot upward, lowering positions at which the vessel (3) is caused to pivot downward, and floating positions at which the hoist cylinders (14) are retracted by the own weight of the vessel (3) to allow the vessel (3) to descend under gravity. A flow rate control valve (40) is provided between the first directional control valve (24) and a tank (16). The flow rate control valve (40) controls the flow rate of the pressurized oil discharged from the hoist cylinders (14) to the tank (16) when the first directional control valve (24) is set to the floating position to allow the vessel (3) to descend under gravity due to the weight thereof.</p> |
