In recent years, the rise of cold-chain logistics has driven the market demand for refrigerated trucks. The brands of refrigerated trucks on the market are also like rivers and rivers, and people can't pick them up. How can we choose a refrigerated truck that has a good taste? What?
In fact, the method of choosing a refrigerated truck and choosing other special vehicles is basically similar, mainly reflected in the chassis, tops, and key components . The quality of a refrigerated truck is mainly reflected in its chassis, incubator, and cooling. On the three major cores of the aircraft, only when the quality of these three cores are reliable, can we guarantee the reliability and stability of refrigerated trucks during use, so choosing a refrigerated truck should also be selected from several aspects.
First, the chassis
1. Truck chassis or towing vehicle form
In general, these are based on the owner's own transport of goods and transport distance to determine the short-haul transport choice light truck chassis, heavy-duty medium and long-distance transport choice of heavy truck chassis or traction semi-trailer form.
2. Import chassis or domestic car chassis
The advantage of the imported chassis is its low maintenance rate, good maneuverability and fuel economy. The disadvantage is that the price is too high. The biggest advantage of domestic car chassis is that it is cheap , but there are more minor problems. Owners can choose according to their own economic strength, but domestic chassis recycling costs are relatively fast, and the quality of domestic cars in recent years is also constantly improving.
Second, the body
1. Set the car according to the cargo
The choice of car body is related to the goods that need to be transported. The refitting manufacturers will customize according to the needs of the users. For example, the refrigerated trucks that carry fresh meat need to be custom-linked on the car body; the refrigerated trucks that do distribution for the stores have small batches and many varieties. Requires multi-temperature refrigerators; different temperature requirements, frequent loading and unloading require more door refrigerated trucks.
2. Can an ordinary freight car be converted into a freezer?
Can be changed, but the general cargo compartment is made of iron or steel, the insulation effect is not very good, but also easy to rust , such as pulling seafood products, due to the corrosive seawater, in the choice of more attention to the car Anti-corrosion of body materials. Therefore, it is not recommended to refit the refrigerator with ordinary cargo containers.
Third, refrigeration unit
1. Advantages and disadvantages of non-independent units
Non-independent refrigeration units are cheap and easy to maintain. But this unit does not have power plant, must rely on car engine with dynamic compressor; affected the working conditions of automotive engines and perform as well as independent units.
2. The advantages and disadvantages of independent units
Stand-alone refrigeration units have their own engine and generator units that provide power and electrical energy to the refrigeration system. Can work independently, not limited by the working status of the car engine. This cold machine performance is relatively stable, but the price is higher and accessories are more expensive.
3. The choice of refrigeration unit
For short-distance distribution within the city or between counties and districts, if the carriage is less than 7 meters, it is recommended to use non-independent units. Not only is the procurement cost lower, even if a failure occurs, it is relatively convenient to find a maintenance point.
For long-distance transportation, where the carriage is more than 7 meters, it is recommended to use a stand-alone refrigerator, because even if the car engine stops working during long-distance transportation, the refrigerator can still be normally cooled to meet the safety of the transported items.
4. Temperature sensor installation position of refrigeration unit
Regardless of the domestic or imported units, it must be noted that the unit's temperature sensor is enough to be installed in the return air position of the evaporator. Because the unit 's temperature sensor is installed in the return air or exhaust position, the temperature reading will differ by about 5 degrees. .
Conclusion: The transportation environment of refrigerated trucks has stringent requirements for the reliability and stability of the transported goods. Therefore, when choosing a refrigerated truck , it is necessary to carefully select the appropriate refrigerated truck according to its own needs.
Scientific life: how to do well in disease prevention during continuous drought?
Recently, the number of outpatients in various medical institutions in Beijing has surged, the number of patients with cardiovascular and cerebrovascular diseases and respiratory diseases has increased, and the beds in some hospital wards are very tight. Experts believe that this is related to the continuous drought.
Although a few days ago, an artificial precipitation ended the 110 day dry weather in Beijing, the air relative humidity in Beijing is still significantly low. The minimum air relative humidity measured by the meteorological department is less than 20%, and the daily air relative humidity is no more than 50%. According to scientific research, the relative humidity of the air comfortable to the human body is 60% to 70%. Exposure to a dry environment for a long time will have many adverse effects on human health.
Recently, during an interview with several major hospitals in Beijing, the reporter found that the number of outpatients and inpatients in hospitals increased sharply. According to experts, affected by abnormal weather, more patients came to the hospital before and after the spring festival than in the same period in previous years, which is related to the activity of bacteria and viruses and the impact of human physiological activities under warm and dry weather conditions.
Experts suggest that in a dry environment, aroma diffsuer can be used to alleviate air drying and moisturize the skin to a certain extent
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