1. Look at appearance
High-quality locks have clear appearance, smooth and not rough appearance. Purchase skills: Touch the appearance of the lock and feel whether the appearance is smooth, so as to judge the quality of the coating of the lock; check whether the lock, lock body, bolt, handle and cover plate and other parts and related accessories are complete; check the electroplated parts , Whether the exterior color of the painted parts is bright and uniform, whether there are rust, oxidation marks and damage.
Some advanced technology can extend the service life of the lock and increase the strength of the lock. For example, pay attention to whether there are defects such as open welding, unwelded, missing welding, etc., and check whether all joints such as the door leaf and the door frame are dense, the gap is uniform, whether the opening is flexible, and whether the paint plating is uniform, strong and smooth.
2, listen to the sound
uses copper-plated locks as raw materials. When opened, the sound is dull, while the sound of copper-plated or stainless steel locks is more crisp. Purchase skills: Use two or more products to check and compare whether they are strong and reliable.
Check whether the lock is open to rotate flexibly. Check the secure structure of the product to see if it is smooth and unimpeded. It is recommended to try at least 3 times for each lock.
If the lock is lighter, the anti-theft function and service life of the lock are not ideal. Purchase skill: Measure the lock core part, the good quality lock core is heavier, on the contrary, the poor quality is very light. Measure the entire lock. Locks made of high-quality materials such as pure copper have a heavier feel, while locks made of materials such as copper plating are relatively lighter.
The main components of the lock body (the slanting tongue, the main tongue, the secure tongue, and the main internal connections and the outer shell of the lock) are high-quality products. These main raw materials are generally 304 stainless steel, which has extremely high temperature resistance and corrosion resistance. The effect, together with effective anti-drilling, anti-impact and other violent actions, can safely guarantee home safety.
4, lock cylinder
The lock cylinder is the center of the anti-theft lock. All anti-theft locks have only one lock cylinder. It is the same as the human heart. It is vital and indispensable to the entire human body. As soon as the lock cylinder is opened, all the lock points are opened, and no amount of lock points is useless.
Most people only look at the shape of a lock when buying a lock. The good anti-theft function is the super B-class anti-theft lock cylinder, which is a super B-class lock cylinder that interacts with a single row of ball marbles, slider marbles, suspended marbles and double rollers. It has low mutual opening rate, strong anti-pull function and open anti-technical , Anti-theft with key, anti-pry, anti-drilling and other advantages. But no matter which kind of smart anti-theft lock you buy, choose a European-style lock cylinder instead of a copper lock cylinder. We can also distinguish the security level obtained from the key, because the more the number of teeth of the key, or the more special, the lower the mutual opening rate of the lock and the better the anti-theft function. Choose a lock with a very different key tooth depth. The tooth shape is too flat, smooth, and shallow, and the mutual opening rate is high, and the anti-theft function is not good.
5, stretch spring
The quality of the spring also determines the life of the lock. If the quality of the tension spring of the lock is not good, the handle is easy to sag, and the life of the lock will be greatly shortened. Buying skills: try the toughness of the tension spring inside the lock, a good tension spring feels very soft, moderately soft and hard.
6, abnormal alarm function