Q: What is a refrigerated truck?

A: Refrigerated truck is a special refrigerated transport vehicle equipped with refrigeration devices and polyurethane insulated compartments. It is often used for transporting frozen food (refrigerated truck), dairy products (milk transport truck), vegetables and fruits (fresh cargo transport truck), vaccines and drugs (vaccine transport truck), etc.

Q: What is the composition of refrigerated truck?

A: The refrigerated truck is composed of the walking part of the special car chassis, the body part (composed of glass steel, color steel plate, aluminum alloy, stainless steel and other materials), the heat insulation layer part (generally polyurethane), the refrigeration unit part, the temperature recorder and so on. For vehicles with special requirements such as meat hook cars, meat hook, aluminum alloy guide rail, ventilation groove and other supporting equipment can be added.

Q: Refrigerated car system technology

A: Most of China’s large refrigerated truck manufacturers use piecewise “sandwich” plate bonding technology, and the inner and outer skins are made of composite materials, such as glass steel plate, color steel plate, aluminum alloy and other materials. The inner material should be transported goods and different materials, the most expensive inner material should be stainless steel plate. The middle layer is the insulation material, mainly polyurethane foam material. The four sides of the glass plate and polyurethane foam material are bonded together with high strength adhesive to form a closed plate; There are also piecewise injection foams and integral skeleton injection foams. Different goods have different requirements for the body. For example, refrigerated trucks transporting fresh meat need to customize hooks on the car body; Refrigerated trucks for the distribution of stores, due to the small batch of goods and many varieties, need multi-temperature refrigerated trucks; For goods with different temperature requirements and frequent loading and unloading, it is necessary to open more door refrigerated trucks.

Q: Refrigerated truck refrigeration unit and power source

A: The refrigerated truck refrigeration unit is generally installed on the front of the top of the container, with an air-conditioned appearance, but it has a stronger cooling capacity than the air conditioner of the same volume. General models use external chillers, and a small number of miniature refrigerated vehicles use built-in chillers. For refrigerated trucks with low temperature requirements, cold plates in the car can be used. Generally, according to the volume of the refrigerated box and the temperature requirements of the transported goods, the refrigeration unit with different power refrigeration capacity is selected. The power source of refrigeration units can be divided into independent and non-independent units. The independent unit has a separate power source, the difference is that the independent unit completely through another unit to generate electricity to maintain work; The non-independent unit drives the refrigeration work of the unit completely through the working power of the engine of the whole vehicle.

Q: Key points of use of refrigerated trucks

A: The use of refrigerated trucks should pay attention to the following points:

1, before loading, the carriage must be pre-cooled or preheated for about 1.5h. Because the vehicle is parked in the open air, usually the temperature of the carriage is the temperature of the external environment, after the goods are loaded into the carriage, the ambient temperature in the carriage will affect the temperature of the goods, resulting in changes in the quality of the goods, so the carriage must be pre-cooled to the necessary temperature before loading.

2, in the loading and unloading of goods must be closed refrigeration unit. Many people do not close the refrigeration unit when loading and unloading goods, which is a very wrong operation, the principle is: When the car is pre-cooled, if you do not shut down and open the door, because the fan of the evaporator of the freezer unit is working, the front of the fan is positive pressure, and the back is negative pressure, so the cold air blows out from the upper part of the car, and the lower part will quickly suck in the hot air outside, resulting in a rapid rise in the temperature inside the car; If the goods are loaded and unloaded after the shutdown, because the fan is stopped, the air flow stops, and the wind pressure inside and outside the carriage is consistent, the speed of external hot air transfer into the carriage is relatively slowed down.

3, the use of refrigerated vehicles, should keep the floor clean. Due to the role of the evaporator fan, the air will circulate in the carriage, causing debris or dirty things on the ground to be inhaled by the evaporator fan. For a long time, a large number of impurities will be sucked into the evaporator coil, thus affecting the refrigeration effect of the refrigeration unit.

4. Proper packaging is essential to protect the goods. If the goods are frozen, use an unventilated packing case. Because the wind blows over the surface of the frozen goods, the moisture in the goods will be lost, which will lead to the quality of the goods. This is the reason why all frozen foods in bulk are not allowed to be sold in our country. For fresh goods, side wall ventilated packing boxes should be used. Due to its own characteristics, fresh goods are still in a breathing state during storage and transportation, and if they are not well ventilated, the goods will deteriorate and be damaged.

5, loading, do not pile the goods too high, be sure to ensure that the loading height is not higher than the plane height of the outlet. If the front of the air outlet is blocked by the goods or is too close to the goods, it will not only affect the storage and transportation temperature of the goods, but also affect the normal operation of the refrigeration unit. Because if the outlet is blocked by the goods, the cold air can not circulate normally in the carriage, which will increase the local temperature of the goods. On the other hand, some defrosting designs of refrigeration units use air induction defrosting, blocking the outlet, which will greatly reduce the defrosting effect.

6, loading must be loaded with double-sided pallet to ensure the circulation of cold air on the ground. It is strictly prohibited to stack the goods directly on the flat floor; Do not cover the pallet with plastic film, which will prevent circulation of cold air to the goods.

Q: The correct maintenance and repair method of refrigerated truck?

A: The maintenance of refrigerated trucks is very important. Only the correct maintenance of the equipment on time can ensure the normal use of the equipment and extend the service life of the equipment.

1, usually the refrigeration unit is every 500h ~ 700h for a maintenance, need to replace the oil filter, fuel filter, air filter; And pay attention to check the tightness of the belt, refrigeration system for leakage.

2. Daily maintenance of the refrigerated car insulation body: inspection of the external surface of the car, inspection of the internal surface of the car, inspection of the external corners of the car, inspection of the internal floor, and inspection of the internal lighting and refrigeration outlet.

3, refrigerated compartment external surface do not scratch, otherwise on the one hand will reduce the ability of FRP to withstand pressure, more prone to aging deformation, on the other hand will make the internal filled polyurethane leakage, thereby affecting the insulation performance of the body.

4, the maintenance of the interior surface of the refrigerated truck to do a good job of temperature control adjustment, do not make the surface of the body ice, if the air humidity is relatively large, to try to pack refrigerated products, especially aquatic products packaging sealing can reduce water evaporation to the interior of the car, reduce the possibility of ice inside the refrigerated truck.