1. When the key cannot be fully inserted into the keyhole when opening the door, if it is winter, first check whether there is ice in the keyhole; if it is in other seasons, check whether there is any foreign matter in the keyhole.
2. If you hear the sound of metal friction when opening and closing the door, you can try dripping a little lubricating oil on the hinge of the security door. If it doesn't work, you can find a professional maintenance worker.
3. Due to frequent use, anti-theft door locks have become the most prone to problems on anti-theft doors, so it is very necessary to maintain the locks. The main problem with anti-theft door locks is that after use After a period of time, it will be very difficult to insert or remove the key. In this case, do not use oil to lubricate it. Using oil will make the door unable to open and will be counterproductive. Use a pencil to rub a few times on the key or blow it with pencil foam. Just lubricate the key in the keyhole.
4. When installing anti-theft doors, cement should be filled carefully to effectively and tightly combine the door frame and the wall. This can also maintain a reasonable cooperation between the door body and the door frame and ensure long-term use. Don't worry about deformation.
5. In severe cold areas, the issue of "overwintering" security doors is also very important, because the indoor and outdoor temperature differences in severe cold areas are very large. When hot and cold water flows, it is easy for the lock core of the security door to get damp, and then the lock core of the security door becomes damp. To avoid freezing, before winter comes, put an appropriate amount of two drops of antifreeze engine oil into the lock cylinder, and then use gasoline or diesel to clean it when the weather is hot in winter.
Do not use vegetable oil as a lubricant for the lock cylinder.
6. The anti-theft door with a latch makes a loud sound when closing. The main reason for the difficulty in closing the door is that the latch tongue is astringent. If you rub some lead or soap on the slope of the latch tongue, it can be lubricated. Function, it will be much easier when closing the door (if you use oil, it will accidentally stick to your clothes).
Note that this method is invalid if the security door is deformed.