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Anonymous users2024-01-241. There are corporate trademarks, corporate logos and enterprise product liability insurance insurance logos on the outside of the product; 2. Remove the outer packaging, and the product should also be covered with a layer of plastic film to ensure that the product is moisture-proof and dustproof during transportation and storage; 3. Remove the film, the appearance of the product should have no obvious defects, no obvious ups and downs on the board surface, no brain injury, scratches, paint stripping, desoldering, and complete product accessories; 4. The doorbell is crisp and pleasant, and there is no long ring and no ring; 5. The cat's eye has a wide field of vision, high clarity, and no damage to the glass lens.
At present, the lock cylinder level on the market is divided into three levels, and its security level is arranged in order from low to high as A-level - B-level - super B-level, which level can be preliminarily distinguished from the key, the key of the A-level lock cylinder has only one row of cogging on each side, and there are two rows of cogging on both sides of the B-level, the cogging of the super B-level is completely different from the A-level and B-level, and the super-B-level lock cylinder is not made of marbles, but with blades, and the key cogging is usually one or more serpentine grooves. As for the C-level that someone said, I have never heard of it, let alone seen it.
It's not that simple! Generally speaking, it can be changed! Changing doors is definitely not needed! >>>More
The security door selection method is as follows: >>>More
1. Choose according to the size and opening direction of the door. >>>More
The thickness of the steel plate of the qualified anti-theft security door frame should be more than 2mm, the thickness of the door body is generally more than 20mm, the weight of the door body should be checked, generally more than 40kg, and the internal structure of the door body can be checked by removing the cat's eye, doorbell box or lock handle, etc., the thickness of the steel plate of the door body should be above, and there are several reinforcing steel skeletons inside, so that the front and rear panels of the door body are organically connected together to enhance the overall strength of the door body. Among them, the fire door should be filled with asbestos (fireproof cotton) and other materials with fireproof function as filling, knock on the door body with your hand to make a "knock" sound, and consumers should be flexible when opening and closing the door by hand. The door-to-door network reminds consumers that the production of fireproof doors should have the qualification certificate for the production of fireproof doors issued by the state.