About the security door made of zinc iron alloy plate

Generally, this kind of anti-theft door is installed in the warehouse or tent, and it is not recommended to use it at home.

As far as the whole market is concerned, there are indeed many types of security doors, the price ranges from a few hundred yuan to several thousand yuan, different materials have different prices, and some of the same material also have different prices, some good and bad. The security door can be roughly divided into stainless steel door (stainless steel security door), copper door (copper security door), aluminum alloy door (aluminum alloy security door), iron.

The zinc alloy material is very good, and the price and corrosion resistance are very good compared to the zinc alloy material.

The doorbell has a key-shaped button. Press it to open the door.

The marble chamber in the pit corresponding to the different depths of the A and B keys has a special structure and is equipped with a 1mm steel ball between the upper and lower marbles. When the A key is used, the height of the lower marble in the marble chamber plus the height of the small steel ball is just flush with the lock cylinder, so the lock cylinder can be unlocked by twisting the lock cylinder with the A key; When using the B key, just the small steel ball can be pushed out of the lock cylinder, that is to say, the lower bead and the lock cylinder are flush at this time, so the B key can also be twisted to open the lock cylinder (this principle is the same as the mother and son key system), but when the lock cylinder rotates at a certain angle, the small steel ball will be affected by the action of the spring spring, and fall into the blind hole that is cleverly designed on the lock cylinder in advance (this is the difference with the key system), some people call this small blind hole a trap, very appropriate. The diameter of this blind hole is larger than the small steel ball, but smaller than the diameter of the marble, otherwise the marble will fall and the lock cylinder will be stuck and cannot be unlocked. >>>More