As a kind of household anti-theft tool, security door has attracted more and more attention. You know that the security door can not only effectively guard against theft, but also play the role of sound insulation and privacy protection. It is the furniture that every family should carefully select. It is responsible for the safety of family life and property. Although they are "iron and steel" warriors, but careless use, a long time without maintenance, there will be more or less small fault oh. Now I will introduce the maintenance methods under various conditions：
1. When the key can not be fully inserted into the lock hole when opening the door, check whether there is ice in the key hole in winter; if it is in other seasons, check whether there are foreign matters in the key hole.
2. When you hear the sound of metal friction when opening or closing the door, you can drop a little lubricating oil on the hinge of the security door. If it doesn't work, you can find a professional repairman.
3. It is very difficult to open the door lock when the key is not used, so it is very difficult to open the door lock when the key is not used Grind it up a few times or blow it into the lock hole with pencil foam so that the key can be lubricated.
4. When installing the anti-theft door, it is necessary to fill the cement carefully, so that the door frame and the wall can be effectively and closely combined. In this way, the door body and the door frame can be reasonably matched, and the deformation is not to be worried about for a long time.
5. In severe cold areas, the problem of "overwintering" of security doors is also very important, because the temperature difference between indoor and outdoor is very large in severe cold areas. When the cold and hot water flows, it is very easy to damp the lock cylinder of the anti-theft door, and then freeze. To avoid this situation, before the arrival of winter, it is necessary to drop two drops of antifreeze oil in the lock cylinder, and then clean it with gasoline or diesel oil in winter. Do not use vegetable oil as lubricant for lock cylinder.
6. The anti-theft door with a latch has a loud noise when closing. The main reason for the difficulty is that the latch tongue is not smooth. If you grind some lead or soap on the inclined surface of the lock tongue, it will be much easier to close the door (if you use oil, it will stick to the clothes carelessly). Pay attention to the deformation of the security door, this method is invalid.
