There are thousands of kinds on supermarket shelves, and there are more than 100 categories. I can't tell you this in detail, and I can't write it down. It can be said that only storage shelves, as well as ordinary storage shelves, high-end automated three-dimensional libraries, etc., are not enough to write a book.

There are also many quality standards for storage shelves, such as load bearing, design, specifications, technology, materials and so on.

Carrying capacity: It depends on your needs, because according to the different carrying capacity, the shelves are divided into light shelves, medium shelves and heavy shelves. Different specifications have different designs and specifications. This load-bearing refers to the weight that a standard four-storey shelf can bear on each floor. Light shelves generally bear about 100- 180 kg, medium shelves generally bear about 200-350 kg, and heavy shelves generally bear more than 500 kg. The higher the load, the higher the quality requirements, of course, the better the quality, but it is a bit wasteful to put something lighter and buy a shelf with a load of 500 kg. If you pursue quality, you can choose the most upscale medium shelf. After all, the current light shelf market is too chaotic and complicated, especially online. You dare to bid, but if you put in 30 kilograms, the quality is estimated to collapse. However, the brand shelves of big manufacturers still have a safety factor in their own standard load-bearing, some are 1.2, some are 1.3, and some big brands are higher than 1.6, that is, the load-bearing exceeds the nominal weight 1.6 times, so there will be no safety hazard in the short term. Long-term use may cause some deformation, but it is guaranteed not to collapse and cause accidents. At present, I know that only the Hercules brand in the north can reach this standard, and three or four brands in the south have reached this standard.

Design: At present, the domestic market design standards are particularly confusing, and many manufacturers make C-shaped steel butterfly hole shelves for light shelves into medium-sized or even heavy shelves, regardless of the safety factor. Of course, there are also some big manufacturers and brands that apply the design standards of traditional heavy or even ultra-heavy (bearing one ton) shelves to heavy and medium-sized shelves. The most typical example is the medium-sized shelves in Gegeris, which use U-shaped steel columns and eagle mouth cards to add bold safety pins. Let's just say that under the same thickness and height, the steel consumption of U-shaped steel columns is almost 1.3 times to 1.5 times that of C-shaped steel columns, and the structural safety is more than twice. In addition to the columns, Hercules medium-sized shelves are fixed with 10 thick reinforced stainless steel screws in the cross braces, which is the same as the super-heavy shelves, rather than the welding method adopted by most factories. It is three or four times stronger. Some manufacturers only need to click the cross brace welding, and two small solder joints can fool things and can be dismantled by hand.

Specification: mainly depends on the thickness of the materials used in each component (pure steel before painting, many manufacturers use the thickness after painting to fool people). Generally, the columns with good quality have 0.4 light shelves and 0.6 medium shelves, which are the minimum and minimum standards. In fact, there should be 0.6 light shelves and 0.8 medium shelves in theory. Pay attention to the material thickness of other parts. Of course, the column is the most critical part of the shelf bearing, and the thickness should be considered together with the design structure. U-shaped steel has a good structure, generally 0.8 mm thick, which is higher than the actual bearing capacity of C-shaped steel 1.0 or even 1.2, and of course it is heavier. Therefore, many shelf manufacturers use C-shaped steel columns, which are time-saving, easy to process, and also appear thick, leaving a third of the cost. In addition, pay attention to the thickness after painting. The thickness of the plate with a thickness of 0.8 mm after painting is about 1.2. Many manufacturers use the thickness after painting to fool people. After painting, it is 0.8 mm In fact, 0.5 is not bad, and it is definitely not a good painting.

Technology: Actually, I don't need to say much about this. Big manufacturers have good technology and strict quality control. It can be said that there are two, one is degreasing and rust removal, and the other is one-step molding. Large manufacturers, or manufacturers with strict quality, use special tanks to operate degreasing and derusting, including a row of tanks, degreasing tanks, derusting tanks, acid-base comprehensive tanks, phosphating tanks, etc. Each step is strictly soaked for 40 minutes to see the effect. If the effect is satisfactory, rinse in the nearest clean water pool and proceed to the next step after 40 minutes. If the effect is not satisfactory, it will take another 40 minutes. After each step, rinse with water for 40 minutes. So it takes almost a day or more to put it down. Small factories, including some big factories now, use production lines to spray paint, which can be completed in one and a half hours. The effect is estimated to be only one-third of that of soaking, and the appearance looks ok, but many corners and parts can't be treated at all, and the service life can be imagined. As far as I know, among the more than 100 factories I have seen in the north, only the Hercules brand of Hebei Walker Metal is still operating by soaking, and there are only three in the south. Dozens of factories in the south used to be soaked, but now they are sprayed. After all, the time is saved by more than one tenth and the cost is reduced by one tenth. One-time molding is mainly a test of machinery. Large factories can buy high-grade machinery, and seven or eight bends with different angles on the shelves can be formed at one time to ensure that the materials are in the best condition. Small factories can only process one elbow at a time with ordinary machinery, and seven or eight elbows can be processed seven or eight times, which causes metal fatigue and seriously affects quality.

Finally, the material: high-quality cold-rolled steel used in large factories, miscellaneous steel used in small factories, or even no steel. At present, it is also the place with the most false propaganda among peers, especially online. I remember chatting online with the boss of a big factory in Nanjing last week. He said that many of his peers kept talking about Baosteel's steel, but the price of his set of shelves was not worth Baosteel's steel money at all, and some of them were even less than half of the steel price. Don't all colleagues want to make money, but they all start public welfare undertakings, using half of the cost price of raw materials as the price of finished products, and the other half as the cost of steel, staff, factory and so on? I had dinner with Hebei Walker Metal Manager and talked about this. He said that they must use cold-rolled steel, but the cost of their medium-sized shelves with the same load is more than double that of many peers, and some even doubled, which leads to their poor online sales performance. I was curious at that time, so I searched online. At that time, the specifications of Hercules medium-sized shelves were more than 600 yuan, and the peers marked 299. Their manager said that now they are selling online in order to take the volume, and the profit will be reduced to more than 500. This is the cost price, but it still can't compete with peers. This phenomenon is really a big problem in the shelf industry, which is worth pondering. There are many manufacturers who insist on quality in our country. Including the Nanjing family and the Hebei family I mentioned, but now their survival has become a problem. In order to survive, they mainly rely on exports, because foreigners look at the quality first and then the price. At present, these two companies are doing very well in foreign trade, especially Walker, Hebei, Europe and America. Which medium-sized shelf I have seen sells the same standard, the same warehouse and the same batch of goods at home and abroad, and the goods sold abroad are better than those sold at home, and much better. I remember that the manager was depressed at that time and said that he was now considering whether to produce a batch of low-quality and low-priced goods to meet the needs of domestic customers. And which boss in Nanjing also said something similar. Although there is export support now, these two companies just have ideas and haven't really produced the so-called domestic high-quality products they don't want to do to reduce costs, but what about the future?