| 摘要 |
PROBLEM TO BE SOLVED: To provide a piston concrete pump that is capable of grasping the piston position even if the operation speed of a driving cylinder is changed.SOLUTION: A concrete pump P includes: driving cylinders 23, 24 expanding and contracting by hydraulic oil sent from a first hydraulic pump Pu1; pump cylinders 21, 22 connected to the driving cylinders 23, 24; proximity sensors LS3, LS4 (piston position grasping means) for detecting the reference positions of pistons 23a, 24a in the driving cylinders; and a control device C for controlling operation of the driving cylinders by output signals from the proximity sensors LS3, LS4 and the amount of hydraulic oil supplied to the driving cylinders 23, 24. |
