| 摘要 |
A pallet positioner is used to locate a pair of pallets in selected positions on the turntable of a concrete pipe making machine. The pallet positioner has a frame supported for vertical movement on upright supports below the turntable. A hydraulic cylinder connected to the frame operates to move the frame up and down. A pallet guide and positioning structure connected to the frame is moved up through holes in the turntable to support pallets above the turntable. The form assembly having two jackets is placed over the raised pallets and locked into the bell sections of the jackets. The form assembly has lock structures which hold the pallets in the bell section of the jackets. The frame and pallet guide and positioning structure is then lowered away from the turntable. The form assembly is moved by the turntable to locate the jackets in vertical alignment with two packerheads. A gear box mounted on a cross head is connected to downwardly directed packerhead shafts operable to rotate the packerheads. The cross head is movably mounted on an upright frame and is lowered to the bottom area of the jackets adjacent the pallets before concrete is discharged into the jackets by separately controlled conveyors. A dual bell packer is moved into engagement with the pallets to rotate and vibrate the pallets to form the bell sections of the concrete pipes. The packerheads are simultaneously rotated and elevated in the jackets, as concrete is discharged into the jackets, to simultaneously build up the cylindrical walls of the pair of concrete pipes.
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