Design and Test of Control System of Mobile Lychee Storage and Spraying Precooling Device

被引：0
作者：
Guo J. [1 ,2 ]
Cai W. [1 ]
Lin J. [1 ]
Lin G. [1 ]
Zeng Z. [1 ,2 ]
Lu E. [1 ]
机构：
[1] College of Engineering, South China Agricultural University, Guangzhou
[2] Key Laboratory of Key Technology on Agricultural Machine and Equipment, Ministry of Education, South China Agricultural University, Guangzhou
来源：
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | 2023年 / 54卷 / 12期
关键词：
control system; lychee; precooling time; spray precooling; STM32; microcontroller;
D O I：
10.6041/j.issn.1000-1298.2023.12.036
中图分类号：
学科分类号：
摘要：
In order to solve the problems of slow precooling speed and high energy consumption of existing lychee origin precooling devices, a mobile lychee storage and spray precooling device control system was designed to improve the guarantee of post-harvest precooling effect of lychee. The system mainly consisted of STM32 main control system, pump driving system, refrigeration system, data acquisition system and auxiliary control system. The intelligent serial screen interface was designed based on USART HMI software. The intelligent serial screen communicated with STM32 microcontroller through TTL serial port, which can complete the setting of lychee spray precooling parameters and display the operation status information of the control system to realize the accurate control of lychee spray precooling device. The test hardware platform was built to evaluate the precooling effect with the test factors of spray flow rate of water pump and load of lychee at single spraying, and the precooling time and uniformity of lychee as the test index. The test results showed that before 1/2 precooling time (HCT), when the spray flow rate exceeded 70 L/min, the spray flow rate had little effect on the cooling rate; after HCT, the precooling time was reduced by 170 s (90 L/min), 260 s (110 L/min) and 262 s (130 L/min), respectively, compared with that under 70 L/min, so that when spraying flow rate was more than 110 L/min, the effect of increase of spraying flow rate on the lychee cooling rate was not significant; test on different loads of lychee found that when the lychee load was greater than 50 kg, increasing the lychee load has a significant effect on the lychee cooling rate; when the lychee load was 50 kg, the uniformity of the lychee precooling completed with the increase in spraying flow first become larger and then reduced; when the spraying flow was 90 L/min, the uniformity of lychee precooling increased and then trended to stabilize with the increase of lychee load. The research results can provide help for the optimization of the control system of lychee spraying precooling device to achieve rapid precooling of lychee after harvesting, so as to protect the lychee after harvesting. © 2023 Chinese Society of Agricultural Machinery. All rights reserved.
引用
收藏
页码：367 / 375
页数：8
相关论文
共 25 条
  • [1] LU Enli, LU Huazhong, YANG Songxia, Et al., Effects of packaging methods on fresh-keeping quality of lychee during controlled atmosphere transport [J], Modern Food Science and Technology, 32, 4, pp. 156-160, (2016)
  • [2] AZAM M M, EISSA A H A, HASSAN A H., Monitoring of change in cantaloupe fruit quality under pre-cooling and storage treatments, Journal of Food Processing and Technology, 6, 12, (2015)
  • [3] WANG Juan, TAN Jincui, WANG Xiangyou, Effect of air velocity on pre-cooling process of Agaricus bisporus[J], Transactions of the Chinese Society for Agricultural Machinery, 44, 10, pp. 203-208, (2013)
  • [4] HAN Qiang, GAO Haiyan, CHEN Hangjun, Et al., Precooling and ozone treatments affects postharvest quality of black mulberry (Morus nigra) fruits[J], Food Chemistry, 221, pp. 1947-1953, (2017)
  • [5] SONG Xiaoyan, LIU Baolin, Temperature variation on Shanghaiqing surface during vacuum cooling process[J], Transactions of the CSAE, 28, 1, pp. 266-269, (2012)
  • [6] HAN Jiawei, ZHAO Chunjiang, YANG Xinting, Et al., Effect of air-inflow velocity on cooling efficiency during forced-air precooling of apples [J], Transactions of the Chinese Society for Agricultural Machinery, 46, 1 1, pp. 280-289, (2015)
  • [7] LU Shengping, LU Enli, LU Huazhong, Et al., Research status and development trends of precooling techniques for fruits and vegetables[J], Guangdong Agricultural Science, 40, 8, pp. 101-104, (2013)
  • [8] JIA Lianwen, LU Ping, WANG Da, Present station and development trend of fruit and vegetable precooling technology [J], China Fruit and Vegetable, 38, 3, pp. 1-5, (2018)
  • [9] RUAN Wenliu, LIN Baolin, SONG Xiaoyan, Comparison of cooling method for lychee fruit [J], Science and Technology of Food Industry, 33, 11, pp. 352-353, (2012)
  • [10] LU Enli, CHEN Minglin, LIU Yanhua, Et al., Effects of different spray precooling parameters on cooling characteristics of lychee [J ], Transactions of the CSAE, 34, 24, pp. 292-298, (2018)
123