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1400 Series Granulators Chapter 7: Appendix 35 of 43
7-4 Pneumatic Hopper Actuator Assembly
The pneumatic cylinder actuators are used to open the hopper on the granulator for
accessibility to the cutting chamber for knife change and adjustment. It is important that the
safety instructions in this manual be read before proceeding to operate the hopper pneumatic
actuator assembly.
The pneumatic actuator assembly has been designed with pneumatic pilot pressure actuated
check valves to prevent inadvertent failure during lifting of full open from power loss,
pressure loss, etc. Additionally, a safety strut is located on one cylinder to mechanically
support the hopper in the full open position. This safety strut (painted yellow) should be
checked for engagement before servicing the machine.
There is a solenoid operated pneumatic valve in this pneumatic circuit that is “closed” when
electrical power is on to the motor, which prevents raising the hopper with power on to the
main drive motor.
Always be sure that the rotor has stopped rotating before operating this
pneumatic circuit to raise the tile plate and hopper.
The hopper is usually shipped detached from the main frame of the machine, which contains
the pneumatic actuator assembly. The hopper should be installed with a suitable overhead lift.
Prior to Operation
Lubricate the two hinge point pins.
Check that all fasteners are properly tightened. Check the fasteners holding the hopper,
hopper tilt plate hinge, top and bottom of pneumatic cylinders.
Check for any pneumatic damage that might have occurred during shipment, which may
require tightening or replacement. Check that all pneumatic hoses and tubing are not pinched,
twisted, or damaged from handling or shipment.
Operation
Shut off the machine and main power disconnect switch per the safety regulations in this
manual. Wait for the rotor to stop rotating before operating the pneumatic cylinder actuators.
Use the following procedure to operate the pneumatic hopper actuator assembly:
1. Loosen and disengage the hopper hold-down bolts, which additionally disconnect
power to the machine via actuation of safety switches.
2. Check that there are no external restrictions from opening the hopper.
3. Rotate the manual pneumatic valve handle to the proper position to cause the
pneumatic cylinders to raise the tilt plate and hopper. Allow the tilt plate and hopper
to rise to the full up position.
4. Be sure that the safety strut is engaged.