Method and machine for making concrete pipe

Details Method and machine for making concrete pipe Method and machine for making concrete pipe

1998-01-07

2000-08-22

Davis, Robert

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264333, 425262, 425145, 425427, 425150, B28B 2128

Patent

active

061067490

ABSTRACT:
A method and apparatus for making concrete pipe with a packerhead concrete pipe making machine having a lift operable to selectively raise and lower the packerhead during the forming of a concrete pipe in a mold while a conveyor delivers a constant supply of concrete to the mold. The operating speed of the conveyor only increases or decreases when the motor load signal which is proportional to the load on the motor that turns the packerhead falls below or goes above lower and upper motor load reference limits. The lift speed of the packerhead varies with the vertical positions of the packerhead relative to the mold.

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