4
Product Description
The
Hercu-Link™
air-powered hoist consists primarily
of a power head assembly that acts as control for lower
hook block movement. The power head assembly is
made up of three main sections: gear reducer section,
brake/motor section and sheave section.
The output shaft from piston motor is connected to
brake shaft. The brake shaft is connected to drive shaft
by way of a coupling that passes through center of
brake and sheave section and acts as sun gear for first
stage planetary reducer. The gear reducer section
consists of three planetary assemblies with each
planetary assembly being driven by sun gear from
previous planetary assembly. Output from planetary
reduction section is transmitted directly to load chain
sheave(s).
The motor-driven brake shaft is connected to brake
through a sprag clutch. In hoist “UP” direction, clutch
allows shaft to rotate without releasing brake. No air
pressure is applied to brake piston in “UP” direction.
The brake shaft cannot rotate in hoist “DOWN”
direction until brake has been released. Brake is
released by air pressure applied to annular brake
piston and piston compresses brake springs, releasing
brake discs. There are four sintered, bronze-type brake
friction discs and five stationary brake discs.
The brake piston is actuated by air from main control
valve. When control pendant “DOWN” button is
pushed, it moves main control valve spool. The spool is
designed to send air to brake in “DOWN” direction
only. When pendant “DOWN” button is released,
exhaust valves allow brake to set quickly and avoid
downward load drift.
Contact your
Ingersoll Rand
authorized service
provider for any parts/service/ inspection/support
related needs.
