1. It is forbidden to drip vegetable oil, lubricating oil, etc. into the lock core. If the lock cannot be opened flexibly, you can use a little pencil lead powder, or check whether there is any rust in the lock hole, the upper and lower connecting lock points, and the door frame lock hole.

If there is rust, you can put a few drops of engine oil on the upper and lower connecting lock points and key holes, and open it several times. 2. Pay attention to the paint surface of the security door to prevent hard objects and sharp objects. When cleaning scratches, drop water into a clean, wet towel, wring it out and scrub. Do not use gasoline, banana water, etc. for cleaning.

3. Frequently wipe the dirt on the door leaf with a clean soft cloth, and make sure the security door is dry and protected from the sun and rain.

The plastic film of the composite steel plate products should be protected to avoid scratches; the plastic sprayed steel plate products should avoid being stained with water or other scale or corrosive substances that are difficult to remove to extend the service life of the security door.

It is recommended not to remove the protective film on the composite board before the decoration is completed, or to cover the spray-coated board with a layer of film.

4. When using the doorbell, you should press the button lightly and replace the battery when the power is low. If you need to leave home for a long time, you should remove the battery.

5. Frequently wipe the door surface with a soft cloth to keep it clean, which can prevent corrosion from corrosive substances and increase the glossiness of the security door.

6. The fastening degree of the expansion bolts used in door frame installation and the wall and door frame should be checked regularly to avoid potential safety hazards.