| 摘要 |
In order to eliminate material distribution inaccuracies, which are inevitable when tubes are centrifugally cast with known devices, a new process and plant are disclosed. The plant has at least two cylindrical centrifuging drums (1) that serve as matrices and an injection carriage (12), provided with a charging arm (11), movable in two mutually perpendicular directions. The novelty of the invention consists of mounting the carriage on a frame (9) movable in a transverse direction to the axis of the matrix (10), on the bottom (8) of the housing, and the carriage can move on the frame transversely to the travelling direction of the latter. The carriage has a sand working silo (13) of relatively small volume linked by a first hose (19) to a large silo (20) out of which it is practically continuously refilled by pneumatic transport. Both silos are provided with weight measurement cells connected with a calculating and controlling device (30) which controls the supply of sand, resin and glass fibers according to a programme that is specific for each tube design. |
