| 摘要 |
PROBLEM TO BE SOLVED: To provide a carrying device improved in the transporting efficiency thereof by providing an upstream part of a mud discharge pipe with a mud discharging valve and an air introducing valve provided with an air flow meter, and forming a plug while alternately opening and closing these valves so as to obtain the predetermined value of air introducing quantity. SOLUTION: A mud discharge pipe 12 is connected to a receiver tank 17 at a rear end thereof in the condition that a tip thereof is always buried in the mud to be discharged inside of a mud tank 11. The receiver tank 17 is connected to a vacuum pump 18 through an intake pipe 19. An air flow meter 16 measures the air flow quantity introduced into the mud discharge pipe 12. A personal computer 30 alternately controls air introducing valve 15 and a mud discharging valve 13 each other through driving circuits 31, 32, and when the mean air flow quantity exceeds the target value, the air suction time is shortened, and while the mud discharging time is prolonged so as to reduce the mean air flow quantity and so as to increase the mean mud quantity to be discharged. With this structure, waste of the power and lowering of the quantity of transportation due to the excessive suction of the air, and clogging of the mud discharge pipe due to the excessive suction of the mud to be discharged can be prevented. |
