Development And Application Of Intelligent Sales Counter For Fresh Fruits And Vegetables

In view of the current domestic and international fruit and vegetable cold-chain last 1 km retail freezers intelligent degree is low,single function,poor preservation effect,large losses,carried out based on local Internet+ remote Internet intelligent control of fruit and vegetable retail counters,intelligent optimization design with the temperature,moisture,air,such as a series of coordinated control,green corrosion function clear counters structure optimization,equipment type selection,parameter control of key technical indicators,such as to develop new products cold chain retail counters,perfecting the innovation fruits and vegetables postharvest precooling,storage,transportation and sale of four nodes technology system.1.Cabinet material optimization and structural design analysis:according to the research on the thermal insulation performance and mechanical strength of the six tested composite materials,it is concluded that the properties of the outer composite materials of"aluminum foil+PE film+foamed polyethylene+foamed polyurethane+PE film+aluminum foil" are significantly better than those of other samples,with a thermal conductivity of 0.0312 W·m-1·K-1 and a breaking strength of 456.8 N/cm.The laminated air supply is preferred,and the embossed aluminum plate is used as the material of the compartment and sub cabinet.The parent cabinet is airtight and insulated,and the sub cabinet is airtight and uninsulated,with no heat and mass transfer and accurate temperature control.2.Insulation performance of cabinet:the cooling speed of three different metal materials is as follows:embossed aluminum plate sub cabinet,iron plate sub cabinet and galvanized steel plate sub cabinet.The cabinet is made of fast cooling and less time.When the counter is working,it is necessary to select the appropriate refrigeration equipment according to the seasonal demand.When the storage temperature of the outer layer cabinet is lower than 0.5℃,the storage temperature of fruits and vegetables can be reached.3.Research on the preservation technology of fruits and vegetables in the cabinet:the mould proof preservation technology of fruits and vegetables in the special cabinet was developed.UV radiation(λ=254 nm,350 μw/cm2)coupled with ozone(concentration of 5 mg/L)was used to inoculate peanut for 30 min.the detoxification rate of AFs and AFB1 were 67.24%and 79.01%respectively,which were significantly lower than the standard limit value.24 h fumigation of 1.2 μL/L 1-MCP of European plum in France could effectively prolong its storage and marketing.Shelf life:the application of LBL method combined the beneficial properties of sodium alginate(1.5%)and chitosan(1.5%)to effectively maintain the storage quality of prune.4.Evaluation on the fresh-keeping effect of fruits and vegetables in the fresh-keeping sales counter:on the eighth day of storage,the weight loss rate of fresh cut jujube fruits in the counter was only 4.01%,lower than 4.62%of that in the ordinary refrigerator;the content of soluble solids was 21.65%,1.1 times of that in the ordinary refrigerator;the color value was 26.84,16%higher than that in the ordinary refrigerator.In conclusion,the fresh-keeping sales counter can better maintain the storage quality of fruits and vegetables.5.Research on counter intelligent control and management technology:develop counter intelligent control and management technology,real-time monitor the temperature,humidity and gas changes in the process of fruit and vegetable logistics,ensure the external environment is stable in the process of sales and transportation after the storage of fruit and vegetable cold storage,always in the most suitable storage environment,and realize the fruits and vegetables welfare preservation.