The door extractor removes and re-installs the oven door.
The steps the machine goes through to remove the door are as follows. First, a hydraulic cylinder (locking pin) disengages a pin which unlocks the carriage for turning. A second cylinder (Swivel) swings the carriage 90 degrees to face the oven battery. The locking pin extends to relock the carriage. Next, a third hydraulic cylinder (lean) leans the carriage side to side to match the position of the door. A fourth cylinder (tilt) is completely retracted so that full tilt is available at the door.
Next, a fifth hydraulic cylinder (carriage) extends the extractor to the oven door. At the door, the carriage stops and the tilt cylinder extends until the bottom of the carriage meets the door. A sixth cylinder (lift) lifts the hooks that raise the door. After the hooks engage, the carriage extend cylinder retracts momentarily to tighten the hooks against the lifting lugs on the door. Two hydraulic cylinders (spring depress) compress the latch springs (or screw motors loosen screws). The PLC stores the position of the tilt and lift cylinders via encoder position for re-installation purposes. Two more hydraulic cylinders (latch) unlatch the door. The door lift cylinder raises the door another inch to break it way from the oven.
The carriage cylinder now retracts the door to the machine. The carriage is unlocked, swung again, this time to the home position, and relocked. The door is replaced in the reverse order mentioned previously. The door is replaced at the same exact position it was removed. The positions for each oven are stored in the PLC and the door can be removed and replaced with minimal operator intervention.