The experimenters wear steel plate protective shoes to detect tires

opening remarks

it is fast to the “Consumer Protection Day” on March 15 every year. At this time, the exposure of bad businesses by various media often makes consumers feel happy. 1n fact, every day except March 15, there are a large number of testing personnel to help us test the performance of all kinds of commodities in people’s life. Recently, the reporter once again went into Qingdao product quality supervision and 1nspection 1nstitute. There are ten large and small laboratories here. They are testing the quality of different commodities every day to ensure the safety of everyone’s consumption. The morning post has launched a series of reports on revealing the secrets of the laboratory since today, to show you the story behind the products

core tips

a journey of a thousand miles begins with a single step. For a car, the tires are equivalent to our shoes. 1f the “shoes” are uncomfortable or even have problems, the car can’t move. According to statistics, the number of private cars in shimagi has exceeded the million mark, and the tires have been changed more and more frequently” Whether shoes fit or not, and whether they are durable or not, are all knowledge. Recently, the reporter came to the national tire and rubber products quality supervision and inspection center to visit the tire testing process

the experimental working area for tire detection under load-bearing condition runs for 47 hours

is the only place where the municipal quality inspection institute does not stop work for 24 hours. More than 20 experimenters work in three shifts, accompanied by roaring experimental equipment to detect tire quality” The tire durability test should run at high speed for 47 hours under the load-bearing condition to imitate the driving state of the tire on the road. ” Hao Yongliang, deputy director of the rubber tire Department of the Municipal Quality 1nspection 1nstitute, said that in this laboratory, people have been testing for 24 hours

the reporter saw that there are rows of tires in the experimental area, as well as more than 300 experimental wheels of different sizes. The experimenters are doing tire detection. As the first state-owned tire inspection center in China’s quality supervision system, the inspection center must test at least 2000 batches of tires every year. Only when the tire test report is qualified can the 3C certificate be obtained, and the manufacturer can sell it to the outside world

work with steel plate labor protection shoes

the whole experimental area is filled with a strong smell of rubber, and there is a huge mechanical roar. After a while, the reporter feels a little uncomfortable, but the experimenters who work here all the year round adapt to the working environment here. Lu Gong, who works on the operating platform, told reporters that tires are prone to danger in the experiment, such as valve core ejected by high pressure, tire burst and injury. He showed reporters their two amulets: earplugs and big shoes” We are required to wear earplugs every day when we work. After the tires are installed on the wheel hub, they are less than 30 kg and more than 400 kg. We have to carry them every day. We have to wear labor protection shoes with steel plates to be safe. ” Lu Gong said

“when we inflate a tire, we should be careful of the valve cores. These valve cores are like bullets. 1f the installation angle is not correct, they will be ejected by the air.” LV Gong said that when inflating some large truck tires, they should simply put the tires in an iron cage, which can prevent large pieces of rubber from hurting everyone when they burst, but it still can’t prevent the damage caused by air waves


choose tires and master these tips

What are the tips for choosing tires? Yesterday, the reporter asked the experts of the inspection center to give you advice

first of all, check the appearance. A good tire has a smooth appearance, and the appearance of the carcass is generally uniform. The appearance of poor quality tire is rough and lusterless, the distribution of tire cord is sparse, and there are serious thin seams

secondly, check whether there are specifications and models, trademarks, factory name, manufacturer address and other sidewall marks, check whether the tires have CCC marks, whether they have passed the compulsory certification, if not, they are not allowed to be sold, and the product quality is not guaranteed

thirdly, it is suggested that consumers should go to big dealers to buy big tire brands with high quality

in addition, the tire is usually marked with twi or twi below the tread groove at the shoulder (transition area between sidewall and crown) Δ The corresponding position of the groove will have a small raised rubber, which is the tire wear mark. When the tread pattern is worn to it, it should be stopped to avoid driving accident caused by excessive wear


if you have any information, please tell us

every year on March 15, various media will expose some bad businesses that infringe the rights and interests of consumers. However, some businesses still set up many “hidden rules” that infringe the rights and interests of consumers… No matter you have ever encountered unfair consumption, or you are an insider in a certain industry, From today on, you can send text messages to your mobile phone number 13061203067 to provide clues and tell about your consumption experience. We will make more hidden rules and industry shady scenes in the consumption field hidden and punished by means of reporter investigation and linkage with law enforcement departments, so as to contribute to a healthier consumption environment. At the same time, Zaobao will select some enthusiastic readers from the number of sending SMS, and visit the laboratory of the Municipal Quality 1nspection 1nstitute in mid March


the tire can only be “cleared” after “hardships”

in the detection process, the tire has to accept all kinds of limit tests, among which the mandatory detection includes five tests of size, strength, durability, high speed, and bead off. Other enhancement tests include rigidity test, conductivity test, and even tire wear test under various road conditions

key words: high speed and durability

set up three “Gates” to prevent accidents

in the laboratory, there is a rectangular constant temperature room with a machine surrounded by iron cages. Hao Yongliang said that this is the tire high-speed durability testing machine, which is specially used to test the high-speed performance and durability of tires. There are nine such machines in the laboratory. The tires in the testing machine are squeezed on the huge round drum by hydraulic device. The steel plate on the drum surface simulates the road surface and runs 24 hours a day. 1n the process of testing, more than ten temperature probes are used to measure the tire temperature at any time, and the air conditioner is used to ensure that the laboratory maintains a constant temperature of 38 ℃

the reporter learned that according to different tire models, the speed of high-speed and durability tests is also different, which is tens of kilometers slow and two or three hundred kilometers fast” High speed running tires will produce high temperature, and the tire pressure will continue to increase. 1n addition to maintaining a constant temperature, we have also set up three protective devices. ” LV Gong told reporters that the first one is the limit switch for automatic shutdown in case of danger, the second one is the protection net to prevent tire fragments from flying out, and the third one is the reinforced glass plate. Last week, when a tire was doing a high-speed performance test, it ran to 240 kilometers per hour and burst two minutes before the end of the test. As a result, the metal protective net was changed

in addition to simulating high-speed driving, the tire also needs to undergo strength test, that is, repeatedly prick the tire with a steel indenter of finger thickness for five times, and finally prick the tire for the last time to see the pricking resistance of the tire” This project is to simulate the sharp objects encountered by the tires in driving to see if the tires are resistant to puncturing. ” The reporter saw that the fifth test made a huge noise, which surprised the reporter who saw the experiment for the first time

key words: aging

after the baptism of low temperature and ozone

in the Environmental Laboratory of the inspection center, the reporter saw many interesting testing instruments, many of which are used to simulate various environments and specially test rubber products. Hao Yongliang introduced to the reporter one by one, including high and low temperature boxes that can simulate – 70 ℃ to 300 ℃ to test the aging degree of rubber products at different temperatures

the reporter also saw two different types of ozone aging test boxes, which are worth millions of yuan. Hao Yongliang told reporters that the principle of this instrument is to produce ozone through high-voltage discharge. When the concentration is the highest, the ozone content can reach 1000 times of the normal condition, and the rubber sample will accelerate aging. After low temperature, high temperature and ozone washing, the detection of rubber products is far from over, and weather resistance testing is needed. Using xenon lamp weather box can imitate the daytime, also imitate the night, and the sun and rain, it can predict the anti-aging ability of rubber products in natural condition.

key words: road test

to run 20000 kilometers a month

the tire inspection center of the Municipal Quality 1nspection 1nstitute has a group of vehicle road test personnel, who are specialized in testing the pending tires of the pending models. 1n the experimental area, the reporter saw two cars covered tightly with car film, and the signs on the tires were also covered very tightly, so it was impossible to see what brand they were. The staff said that these tires were not listed products, so they need to be kept secret

sun qinjun, an engineer with 10 years of road test experience, said that tire road test is mainly to cooperate with manufacturers to develop new models. Automobile research and development usually has a four-year cycle, most of which are developed by various parts manufacturers and finally assembled by automobile manufacturers. Tire road test is one of the most important parts. Manufacturers usually require road testers to run 20000 kilometers in a month

“it’s a big challenge for drivers and tires to run the kilometers of other cars in a month in a year.” Sun qinjun said that high-speed roads, mountain roads, etc. are included, and the ultimate goal of running hundreds of kilometers every day is to wear out the tires, so as to test whether the tires can withstand the test

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