Importance

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Abstract

A concrete product making machine having a counter rotating packerhead assembly and a concrete supply control operable to maintain a desired amount of concrete in the mold above the packerhead assembly. The counter rotating packerhead assembly has a lower packerhead unit rotated in one direction by a motor and on upper packerhead unit rotated in an opposite direction by hydraulic motors mounted on the cross head of the machine. The upper packerhead unit located above the lower packerhead unit has a plurality of rollers and an annular trowel. The trowel has radially adjustable shoes which meter the flow of concrete to the lower packerhead unit. A control system responsive to hydraulic fluid pressure supplied to the hydraulic motors controls the operation of a concrete supply conveyor operable to deliver concrete to the chamber above the packerhead assembly. The control system includes a control valve assembly operable to regulate the supply of hydraulic fluid to a hydraulic motor operating the conveyor. The control system includes a control valve assembly operable to regulate the supply of hydraulic fluid to a hydraulic motor operating the conveyor. The control system has a pivoted arm connected to a valving member of the control valve assembly. A cylinder having a piston connected to the arm receives the hydraulic fluid under pressure supplied to the hydraulic motors that drive the second packerhead unit. The cylinder controls the position of the arm and valving member in response to the pressure of the fluid supplied to the hydraulic motors. A biasing spring assembly connected to the arm moves the piston into the cylinder to a retracted position when hydraulic fluid pressure supplied to the piston is reduced thereby allowing the valve assembly to return to the open position to continue the supply of hydraulic fluid under pressure to the conveyor hydraulic motor.

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First Claim