Adaptive valve control system for an impact device

Details Adaptive valve control system for an impact device Adaptive valve control system for an impact device

1977-11-23

1978-12-26

Staab, Lawrence J.

Tool driving or impacting

Processes

173 2, 173115, 91 40, 91275, F15B 2102

Patent

active

041311647

ABSTRACT:
Switch means on the frame of a forging device senses when the ram and piston enter a first zone of a pneumatic cushion during retraction to initiate timing. If a predetermined time has expired before the ram leaves the first zone, the fluid inlet valve is opened. If not, switch means senses when the ram and piston enter a second zone to initiate a second timing. If a second predetermined time expires before the ram leaves the second zone, the fluid inlet valve is opened. If not, switch means senses when the ram and piston enter a third zone, and after a predetermined time the fluid inlet valve is opened. Thus, by sensing ram position and measuring time ram remains within each zone, the effective upward velocity (distance/time) is measured and adaptive controls applied.

REFERENCES:
patent: 2691962 (1954-10-01), Johnson
patent: 2931388 (1960-04-01), Renick et al.
patent: 3464315 (1969-09-01), Weyer
patent: 3818799 (1974-06-01), Hague

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