7.3. TECHNICAL SHEET ST03 - DOOR CLOSING UNIT
The autoclaves are equipped with a motorised door closing and locking device that uses a worm screw system,
driven by the door gearmotor powered with 24Vdc.
The door servomotor unit is secured to the right side of the chamber and can be accessed after removing the right
side panel.
The servomotor unit includes a vertical gearmotor which transmits the drive to a horizontal drive shaft ending with a
worm screw with a trapezoidal cross-section.
The latter, once activated, is screwed to the threaded bushing fitted on the porthole support crossbar, making the
porthole move until the door is closed and then locked.
To ensure a silent rotation and a better resistance to effort, the shaft rotates on a ball slewing ring positioned inside
the front support of the servomotor unit.
The servomotor unit activation is controlled by the door itself, by means of an actuator pin which acts on the door ajar
microswitch.
In this first closing phase, the servomotor unit, supported by the sliding plate in anti-friction material, reacts
mechanically moving forward and sliding on the steel pins. The closing phase ends when the end-of-stroke
microswitch is activated and stops the servomotor.
When the cycle starts, the gearmotor is activated; it stops when a value ranging from 3.2 to 3.6A is reached.
Upon the first vacuum pulse, with a negative pressure of -0.80 bar, the door is further closed by approx. ½ of the
shaft rotation, ensuring a perfect sealing of the closure.
The opening command allows the servomotor to move back, freeing the door, which is moved away from the
chamber thanks to the thrust of the actuator pin; the end-of-stroke microswitch and the door ajar microswitch are
disabled in this phase.
SERVICE OPERATIONS
Replacing the gearmotor
- With the door open, remove the Benzing ring from the rear side to unlock the gearmotor of the drive shaft.
- Remove the gearmotor carefully, making it slide towards the rear part, without removing the front retaining ring
and the pre-load spring washer.
- Check the correct positioning of the front retaining ring and of the pre-load washer and insert the new gearmotor
in the drive shaft.
- Exert a moderate pressure on the gearmotor to facilitate the insertion of the Benzing ring
Replacing shaft / worm screw
- With the door open, remove the Benzing ring from the rear side to unlock the gearmotor of the drive shaft.
- Remove the gearmotor carefully, making it slide towards the rear part, removing the front retaining ring and the
pre-load spring washer.
- Remove the 4 screws securing the full shaft support plate to the servomotor support.
For an easier operation in models equipped with EVO10 / HX10P3 vacuum pump, extract the pump from the
autoclave.
- Slide the support out, complete with shaft/worm screw, actuator pin, plate and sliding pins, ball slewing ring
- Insert the new complete support; check the correct positioning of the slewing ring and of the actuator pin and lock
it using the 4 retaining screws
- Check the correct positioning of the front retaining ring and of the pre-load washer and insert the new gearmotor
in the drive shaft.
- Exert a moderate pressure on the gearmotor to facilitate the insertion of the Benzing ring
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