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Design and experiment of an automatic supplement system of milk for
piglets in farrowing unit of large-scale pig farms

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CAO Qing ,KONG Xianrui ,DING Pan ,LI Can ,NIU Zhiyou ,LI Zhiwei 2
1.College of Engineering/Ministry of Agriculture and Rural Affairs Key Laboratory of Smart Farming for
Agricultural Animals， Huazhong Agricultural University， Wuhan 430070， China；
2.Shenzhen Huinong Technology Co.， Ltd.， Shenzhen 518000， China
Abstract An automatic supplement system of milk for piglets in the farrowing unit of large-scale pig
farms with homeothermia circulation was designed to realize the functions including preparing milk， feeding
circularly， and cleaning automatically to solve the problem of low level of automation in nursing piglets in
large-scale pig farms. The overall structure and working principle of the supplement system of milk for pig‐
lets were explained. The structural design and theoretical analyses of key components including the mixing
tanks， stirrers， circulation pipelines， delivery pumps， and auxiliary heaters were conducted. A control sys‐
tem for the supplement of milk was developed with Siemens S7-200 SMART as the core processor. Hu‐
man-computer interaction through a touchscreen was realized by controlling the flow state of the milk sole‐
noid valves and relays， and monitoring the physical parameters of milk with flow sensors， temperature sen‐
sors， liquid level sensors， etc. A prototype was manufactured and the performance of prototype was tested.
The results showed that the overall average coefficient of variation for the uniformity of the milk prepared
by stirring was 0.435%， and the pipeline pressure ranged from 26.0 kPa to 65.2 kPa. All milk refilling
bowls were filled with milk within 6.1 seconds， with the temperature of milk controlled between 40 ℃ and
42 ℃. It is indicated that the designed automatic supplement device of milk for piglets in the farrowing unit
has good uniformity of milk， reasonable distribution of pressure， with the temperature of the milk meeting
the requirements of supplementing milk for piglets， thereby satisfying the production needs of automatic
supplement of milk for piglets in the farrowing unit.
Keywords piglet milk supplementation； automatic supplement system of milk； auxiliary heating；

homeothermia circulation； farrowing unit

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