What should I pay attention to when using refrigerated trucks?

1. Correct operation can ensure that the goods can be kept and transported in good condition.Only the correct use and operation of refrigerated vehicles, can ensure the good delivery and preservation of goods.Because refrigerated vehicles are specially used for temperature-sensitive products, temperature assurance is the key to refrigerated vehicles.If used or improperly handled, the goods cannot be kept or transported in good condition.

2. Preventive maintenance can minimize maintenance and operating costs.In our normal use process, the maintenance and maintenance of vehicles and refrigerating machine is inseparable.Only on time for the correct maintenance and maintenance of equipment, in order to ensure the normal use of equipment and extend the service life of equipment.Generally, chassis engine is maintained according to the mileage, while the refrigerating unit is maintained according to the working hours of the engine.The normal refrigeration unit is 500~700 hours for a maintenance and maintenance, need to replace the oil filter core, fuel filter core, air filter core;And pay attention to check the belt tightness, refrigeration system whether there is leakage;However, at present, in order to adapt to the demand of environmental protection, some brands of refrigerating units (such as the United States cold king) try to reduce the damage to the environment, reduce the emission of harmful substances, so the use of synthetic oil or semi-synthetic oil to replace the ordinary oil, thus extending the engine maintenance time, usually in accordance with 2000 hours to do a maintenance.Therefore, the waste oil emission is reduced.In addition, through scientific experiments, the use of this high-end oil, not only reduce the wear and tear of the engine, but also can reduce the engine fuel consumption.Therefore, scientific maintenance and maintenance can not only ensure the integrity of equipment, but also reduce operating costs.

Proper packing is very important to protect the goods.Unventilated packing boxes for refrigerated goods and side-wall ventilated packing boxes for fresh goods.Packing cases must be pressure-resistant.Since the wind is not allowed to blow over the surface of frozen goods, because the wind blows over the surface of frozen goods, the moisture in the goods will be lost, which will lead to the quality of the goods.This year our country formulates about bulk fast frozen food is prohibited to sell absolutely, must have pack sale is this reason.However, due to its own characteristics, fresh goods are still in a breathing state during storage and transportation. If they cannot be well ventilated, the goods will deteriorate and be damaged.Therefore, good ventilation and ventilation must be ensured for such goods.

4. Set the thermostat on the required temperature and pre-cool the car box for 1.5 hours to remove the heat trapped in the car box;When loading, turn off the refrigerating unit and load quickly.The carriage must be precooled or preheated before loading.Because the car is parked in the open air, the car temperature is usually the external environment temperature.If the temperature of the goods transported is not the ambient temperature, and the goods are loaded into the carriage, the ambient temperature will affect the temperature of the goods transported, thus causing the quality of the goods transported to change.Therefore, the carriage must be pre-cooled to the required temperature before loading.However, the refrigeration unit must be shut down during loading (as well as unloading).Many people do not turn off the refrigeration unit when loading or unloading goods. In fact, this is a very wrong operation.Reason is: when we put the car after the precooling, if you don't shut down, opened the car door, as a result of the refrigeration unit evaporator fan is working, the front of the fan is positive pressure, which is on the back of the negative pressure, so the air conditioning blow out from the upper carriage, the lower will be the hot outside air sucks in quickly, leading to the rapidly rising of temperature in the car;If goods are loaded and unloaded after shutdown, as the fan is in a state of shutdown, the air flow stops, and the wind pressure inside and outside the carriage is the same, the speed of external hot air transfer into the carriage is relatively slow.

5. The goods must be pre-cooled to the required temperature. Check the temperature of the goods when loading;The refrigerating unit is used to keep the temperature of the goods, not to reduce the temperature of the goods.Many users of refrigerated vehicles have a false concept that the refrigerating unit on a refrigerated vehicle is free to refrigerate or heat the goods loaded into the compartment to the desired temperature.Therefore, the cargo that is not enough to transport the temperature required is loaded into the carriage, and then the refrigeration unit is set to the transport temperature required by it, and the cargo temperature is lowered or raised to the temperature required by it in a certain time.On the contrary, instead of cooling the goods down (or rising), they are damaged or spoiled.Because the refrigerating unit of the refrigerating truck does not lower the temperature of the goods, but maintains the temperature of the goods. It is just like the quilt we used to use when selling cold drinks to wrap the goods.When the external cold (heat) source through radiation, conduction, convection to the body, by the refrigeration unit blown out of the air conditioning, isolation of heat source into the cargo.Therefore, the temperature of the loaded goods must be measured before loading.If the set point temperature of the refrigeration unit is higher than or lower than the temperature of the cargo, it is difficult for the cargo temperature in the carriage to reach the required temperature for transportation.The storage temperature of the goods must be the same as the transportation temperature. If the temperature of the goods changes frequently, water will be lost, which will lead to the quality change of the goods and shorten the shelf life of the goods.

6, even if the capacity of the unit exceeds the actual needs, insufficient air circulation will be the main cause of deterioration;Any blockages around the goods can lead to -- "hot spots."A qualified refrigerated car must have good ventilation on six sides of the carriage and no obstruction on six sides of the goods.Good air circulation ensures that goods are transported at the right temperature.The cold (hot) gas blown out by the refrigerating unit protects the cargo by isolating the cold (hot) source from the outside entering the compartment.If a blockage occurs at a certain location, the cold (hot) source of that part will enter the goods directly, causing the temperature of the goods to change.Ensure the return air shield is in good condition;Do not block the inlet of evaporator (return air);Insufficient return air will result in irregular circulation of cold air and ice on top of cargo.

7. Goods must be stacked on double-sided pallets;Fresh goods pallet can not be wrapped plastic film, film will block the circulation of cool air to the goods;Do not block the floor under the cargo.General refrigerated car floor is the use of ventilation with aluminum rail floor;But there are also some refrigerated vehicles are not with aluminum guide rail, is the use of flat anti-skid floor.Usually used as a third party transport enterprises or dairy products for the enterprise transport vehicles is the use of flat non-slip floor, the purpose is suitable for the transport of a variety of products, or to facilitate the cleaning of the floor.However, attention must be paid to loading with double-sided pallets to ensure the circulation of cold air on the ground.It is forbidden to stack goods directly on the flat floor.

8. Do not pile up the goods before the evaporator exit, otherwise it will hinder the cold air flow;A blockage above the cargo will short-circuit the cold air flow.Maintain a minimum distance of 225 mm between the top of the cargo and the roof of the vehicle.When loading, do not pile the goods too high, must ensure that the loading height is not higher than the plane height of the outlet.If the air outlet front is blocked by the goods or is too close to the goods, not only the storage and transportation temperature of the goods will be affected, but also the normal operation of the refrigeration unit.Because the air outlet is blocked by the goods, the cool air (or hot air) cannot circulate normally in the carriage, so that the local temperature of the goods increases.On the other hand, some of the defrosting designs of refrigerating units use air induction defrosting.When the goods are too close to the air outlet, the coil tube in the evaporator of the unit will quickly frost (or ice), and the air induction switch will immediately move, and the unit will quickly enter the defrost state;When the coil temperature rises to about 9 degrees (design temperature), defrost immediately.Then the unit will appear to cycle the above operation, resulting in the box body temperature can not come down.What gives everybody only view feeling is the unit always is frequent defrost.It's actually because the goods were loaded too high (much).

9. The interior of the carriage must be kept clean;No wrapping paper and paper scraps shall be left on the floor;Debris can block air flow or be inhaled by evaporators.When using a refrigerated car, the inside of the car should be kept clean.Due to the role of evaporator fan, air will circulate in the carriage, resulting in ground debris or dirt being inhaled by evaporator fan.For a long time, a lot of impurities will be inhaled into the evaporator coil tube, which will affect the refrigeration effect of the refrigeration unit.Because the coil is surrounded by a little impurity, the heat exchange rate of the coil decreases.So the refrigerator car after a few years of use everyone will feel that the refrigeration effect is not as good as the beginning, in addition to the fault itself, is because the coil is too dirty.Therefore, to ensure the cleanliness of the floor is the key to ensure the normal operation of the refrigeration unit.

10. Proper handling;Close the refrigerator when the door opens;Minimize door opening time;Use strip curtains when loading and unloading goods.Partitions are used to separate dry goods (empty baskets) from perishable goods.In order to ensure the temperature of the goods in the carriage, for the city distribution vehicles, it is recommended to use a strip door curtain, so as to ensure the rapid unloading (when the refrigerating unit is not closed), the air conditioning in the carriage will not be lost quickly.Goods of different temperatures are strictly prohibited to be stored in the same compartment space.Partitions should be used to separate them.Since the refrigerator is used to maintain the temperature of the goods, rather than to cool them down, the mixed loading of goods with different temperatures will affect the temperature of the goods, thus affecting the quality of the goods.Proper operation and use of refrigerated vehicles is the key to ensure the quality of temperature control goods.It is also to ensure that the refrigeration equipment can work properly.The containers of insulated refrigerated vehicles are similar to containers, but are made of materials with better heat insulation effect, reducing heat exchange.Suizhou ruike special steam reminder: because the food cold chain is to ensure the quality of perishable food, to maintain the low temperature environment as the core requirements of the supply chain system, so it is higher than the general room temperature logistics system requirements, more complex, construction investment is much larger, is a huge system engineering.