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J. DOOR SYSTEMS
The dryer utilizes two (2) styles of doors, which are Manual Doors and Pneumatic Automatic Doors.
1.
Manual Door Description
The Manual Doors run on a single aluminum track with a wheel assembly mounted above the doors and a
channel with teflon strips mounted on the bottom of the doors...
a. For dryers manufactured as of October 19, 1999, there are trolley bolts located at the top of the doors to
secure the doors onto the track.
In the center portion on the top of the doors there is a magnet used in conjunction with proximity sensors
which are mounted above the doors.
2. Pneumatic Automatic Door Description/Operation
a. Description
The Pneumatic Automatic Doors run on a single aluminum track mounted above the doors and a split
track mounted on the bottom of the doors. The doors are held on the track by four (4) stainless steel
wheel assemblies; two (2) are located on the top of the doors and two (2) are located on the bottom of
the doors. Additionally, in the center portion on the top of the doors there is a magnet used in conjunction
with proximity sensors which are mounted above the doors.
b. Operation
There are two (2) 1-inch (2.54 cm) bore x 18-3/8” (46.67 cm) stroke cable cylinders attached to the top
of the doors to pneumatically open and close the doors. When air is applied into the outside ports of
these cable cylinders the doors will open. If air is applied into the inside ports of these cable cylinders the
doors will close. On each of the four (4) ports is a flow control valve used for adjusting the opening and
closing speeds of the doors. These flow controls only vary the speed in the exhaust direction. Air to the
cable cylinders is supplied through a 4-way valve. When 24 VAC is applied to the valve, the doors
open...if no power is applied, the doors close. A 3-way valve is used to supply air to the 4-way valve.
If the “EMERGENCY STOP” (E-Stop) is engaged, the air is automatically exhausted so that the doors
can be opened manually.
1) In a 2 door application, there are two (2) additional cable cylinders and a 4-way valve added for the
operation of the rear doors.