Check whether the function of the product is reliable and flexible. Two or more products should be selected for comparison check. Especially when purchasing the two-way lock product, the inner and outer locks must be tested with all the keys. You should also check the insurance organization of the product. It is recommended to try each lock at least three times.
1. Products of enterprises with high reputation, stable quality and good after-sales service should be selected.
2. First check whether the logo and logo of the purchased product are complete (including the product's implementation standards, grades, manufacturer's name, address, production date). The package is firm, the contents of the manual are consistent with the product, and the caution is exaggerated. The facts do not match the phenomenon.
3. Observe the appearance quality of the product, including the lock head, lock body, lock tongue, handle and cover plate parts and related accessories, whether the surface of the plated parts and painted parts is bright, whether there is rust, signs of oxidation and damage. .
4. Check whether the product use function is reliable and flexible. Two or more products should be selected for comparison check. Especially when purchasing the two-way lock product, all the keys must be used to test the inner and outer locks separately. You should also check the insurance organization of the product. It is recommended to try each lock at least three times.
5. Then check the tooth condition of the key, such as five key teeth, each key should have not less than three different key teeth, while the first tooth and the fifth tooth should try not to choose the deepest key tooth, which is good for the key. The insertion and removal is not easy to break.
How to choose the door and window locks from the lock material and from the standard
First, materials When people buy locks, they are generally worried that the locks are not durable or they will rust or oxidize for a long time. This problem is related to the materials used and surface treatment issues. From a durable point of view, the best material should be stainless steel, especially as a surface material, the more bright it is. It has good strength, strong corrosion resistance and constant color. However, there are many kinds of stainless steel, which can be mainly divided into ferrite and austenite. Ferritic stainless steel has magnetic properties, commonly known as stainless steel. It takes a long time, and the environment is not good, it will rust. Only austenitic stainless steel will not rust. The identification method is very simple. It can be identified with a magnet. Copper is one of the most widely used lock materials. It has good mechanical properties, good corrosion resistance and processing properties, and its color is beautiful. Especially for copper forged handles and other locks, the surface is flat, the density is good, and there is no air hole. Sand eyes. It is both strong and rust-proof. It can be used for plating various surface treatments such as 24K gold or gold, which is magnificent, noble and generous, adding a lot of color to people's home. Zinc alloy materials have much lower strength and rust resistance, but have the advantage of being easy to make parts with complex patterns, especially for pressure casting. The locks of the more complicated patterns seen in the market are likely to be made of zinc alloy, and consumers should carefully identify them. Steel, good strength, low cost, but easy to rust, generally used as the internal structural material of the lock, not suitable for external decorative parts. Aluminum or aluminum alloy, ordinary aluminum alloy is soft and light, and the material strength is lower, but it is easy to process.
Second, surface treatment Surface treatment refers to the use of metal electrodeposition, coating, chemical oxidation or other processing methods to cover or form a protective film on the surface of the part. The film mainly acts as a preservative, and at the same time increases the aesthetics and durability of the product, which is an important factor for directly measuring the quality of the product. Common methods for measuring surface treatment include: thickness measurement of the cover layer, joint force inspection, salt spray and moisture test, and visual inspection. The coating is applied by methods such as film adhesion, hardness, moisture test, and visual inspection.
The new standard for door locks in China is introduced in June 2000 and implemented in October 2000. There are 4 national standards for original door lock products. The release was implemented in 1988, but with the continuous development of the market economy, the door lock products have undergone great changes. The variety of products is continuously enriched and the quality level is continuously improved. The original national standards and professional standards are far from meeting the requirements of the door lock quality technology under the new situation. Especially when China's accession to the WTO is imminent, economic global integration is imperative, and the grade and quality of China's door lock products must be improved. In order to keep in line with the international situation, in order to narrow the gap with the developed countries in the world, it is conducive to eliminating trade barriers and increasing foreign exchange earning in exports to promote the development of China's lock industry and participate in international competition. Therefore, the original door lock standards must be revised. The National Light Industry Bureau and the National Daily Hardware Standardization Center issued separate notices to revise the original four door lock standards. The original marble door lock is combined with the external double-door lock, and the double-locked door lock is added to become the standard of the external door lock. The light industry standard QB currently implemented is the revised new standard.
Consumers should consider the following aspects before purchasing a lock before purchasing.
1. The location used and its importance. That is, consider using it on a street front door, hall door, room, bathroom or passageway to select a product that suits the desired function.
2. The environment, conditions and requirements for use. You should consider the advantages and disadvantages of the use of the environment, such as dry humidity, door structure, thickness, left or right door, inner door or outer door to prevent the wrong product.
SPCR140
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Resins For Solid Phase Synthesis SPCR140
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