First, according to the way of unlocking:
1. Open the padlock: it means that the key is in the lower part of the lock. After unlocking, the lock beam (lock hook) is pushed out.
2. Beam padlock (also known as giant padlock): Just like the first picture
3. Password padlock: Because the padlocks opened with keys are high because of the high mutual opening rate, especially the smaller size padlocks, the high mutual opening rate is not suitable.
Therefore, the password padlock was developed. Its features: up to 10,000 passwords
Second, by material:
1. Stainless steel padlock: This type of padlock is characterized by strong anti-oxidation ability and is suitable for outdoor use. However, due to the difficulty in processing, the cost is relatively high and the domestic use is less.
2, copper padlock: the main material of the lock is copper, the most common use is a small copper padlock, that is, the size of 40mm or less, mainly copper price is relatively high.
3, iron padlock: the use is very common.
A, electroplated iron padlock: table
B. Gray iron padlock: The surface is treated with gray paint, and many colored padlocks appear afterwards.
C, imitation copper padlock: In fact, it is an electroplated iron padlock, which refers to copper plating on the surface.
Third, the evolution of padlocks
1, fork lock
2, chain lock
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