In the past month, all walks of life have pursued and remembered our “most beautiful driver” Wu Bin in various ways. As a bus driver, he burst into breathtaking moral light at the critical moment of his life, making everyone respect and respect. At the same time, he also regrets that because he is young. After painstakingly studying the causes, we can not help but sigh. If security is prevented, the tragedy will not be staged.

● drum brake, the culprit <br> <br> According to the police investigation Wuxi, in the "5.29" incident, resulting in "the most beautiful driver" Woo was killed in "Fatal iron" comes from a certain brand of large trucks. The truck had replaced a damaged brake hub on June 1 for two possible reasons: the brake parts were not properly riveted, or the brake parts did not pass quality. We do not discuss what kind of reasons it is because the drum brake itself has congenital safety flaws and it is one of the main reasons for the frequent occurrence of truck accidents in our country.

From the point of view of the initial structural design, the temperature of the closed drum brake may exceed 400 degrees during continuous braking; the reason for the design structure is that the friction surface of the brake shoe and brake drum in the relatively “closed environment” is very If it is difficult to dissipate heat, not only will the brake effect fade, but it will even cause brake failure. If the water source such as water on the road is splashed by the tire to the brake drum in a high temperature state, it is very easy to cause the brake cymbal to break, and in severe cases, the ruptured brake drum debris is thrown directly.

Is there no other brake to replace the drum brake?

● disc brake, or will become the national standard <br> <br> in Europe and other developed countries, especially in light truck truck, drum brake has long been out of the market. In China, because there are no mandatory national standards, and limited by the R&D and cost of the company, only a few high-end trucks use disc brakes with high safety. All of them are designed for front and rear drums, and many trucks are Four-wheel drum brakes.


Disc brake structure Compared with drum brake, disc brake has good heat dissipation performance. When the disc brake is continuously braked, the maximum temperature is 200 degrees lower than that of the friction brake of the drum brake. Because the friction surfaces of the brake shoe and the brake disc are directly in contact with the air flow, the heat generated during the friction can be Direct ventilation and heat dissipation ensure the stability and reliability of the truck during long-distance braking. In addition, in the disc brake system, the “caliper” structure of the brake shoe and the brake disc determines that the brake disc and the brake shoe cannot be broken into pieces to be thrown under any circumstances. Obviously, the safety risk of using disc brakes for trucks will be greatly reduced.

It is worth mentioning that at the end of May, in order to improve the safety of trucks operating in the city, the local standards interpretation center for the operation of trucks in the urban center of Beijing Municipality has formulated local standards for Beijing, and it will be mandatory to use the disc system for the front axle of commercial trucks. move. To a certain extent, Beijing local standards indicate the future development trend of trucks in China.

● follow the trend of truck safety, four-wheel disc brakes <br> <br> light truck came to follow the development trend of truck safety, long ago, four-wheel disc brakes Chery's first light truck Dirks green card officially off the assembly line, came on to get The approval of local standards in Beijing.

The front face of the Kerry green card It is understood that the Kerry green card has a new breakthrough in the safety of light trucks. For the first time, a four-wheel disc brake system is adopted for innovation. In addition, four-channel ABS and EBD are configured to prevent the vehicle from slipping during emergency braking. And prevent wheel locking, greatly improving the safety. In addition, in order to improve the safety of the vehicle, the development of the Garrett Green Card was optimized based on the reasons for the frequent occurrence of truck accidents in the binocular obstacle angles of the headlights, rearview mirrors and A-pillars.

For example, in China, truck drivers mostly choose to get out at night. The integrated crystal headlights of the Kerry Green Card not only provide an elegant and elegant atmosphere, but also equipped with an independent high beam and a lenticular type of low beam, providing sufficient illumination to protect the driver's night driving safety. The Karry Green Card strives to reduce as many vehicle safety hazards as possible in truck hardware configurations and provide more safety and security for drivers and passengers.

The "most beautiful driver" incident gave us a bloody lesson. It is imperative to promote the upgrading of truck safety configurations in China as soon as possible.

Storage Tank Water Heater

A storage tank water heater is water-heating container that uses a large tank to store hot water until it is needed. This type of water heater is typically powered heating steam or gas, and is used to provide hot water for a variety of uses, including showers, dishwashing, and laundry, or other hot water requests alike. The tank is typically insulated to help maintain the water temperature and reduce energy costs. Storage tank water heaters are a popular choice for many households because they are relatively inexpensive and can provide hot water for multiple uses.

Typical heat exchanger structure is heating spiral coil inside of a steel shell. Water will be heated while passing through inside the coil, and received the energy or heat from hot steam or gas.

The main disadvantage of a storage tank water heater is that they are less energy efficient than tankless water heaters. This is because they continuously heat and reheat the same water, which can waste energy. Additionally, storage tank water heaters require more space than tankless water heaters, as they are larger in size.

In that sense, recent years are seeing storage tank water heat exchanger giving way to other efficient products, such as Shell And Tube Heat Exchanger, Plate And Frame Heat Exchanger, and so on.

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