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| Research on design of automatic detection system for soil limit moisture content |
| CHEN Meng-yuan1,2 |
1. Anhui Key Laboratory of Electric Drive and Control, Anhui Polytechnic University, Wuhu 241000, China;
2. Department of Precision Machinery & Precision Instrument, University of Science and Technology of China, Hefei 230027, China |
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Abstract In order to solve the problems of traditional soil limit moisture content detection,such as artificial site operation mode,long time consuming,data collection difficulties and poorly in data transport on real-time,an automatic detection device for soil limit moisture content was de-signed.The device adopted SIEMENS S7-200PLC as the control core, and the hardware comprised conveyor belt,cube container,stirring device,electronic scales,smooth system,cone penetrometer and heating box,and real time data was monitored by using MCGS configuration software on the host computer,and it used the sampling drying method to measure moisture content and took liquid-plastic limit combined measurement to measure liquid-plastic index.In practical applica-tion,the system could complete automatic mixing,simultaneous determination of multiple sets of data and real-time data transfer.The classification of soil and estimation of bearing capacity of foundation soil were achieved by using moisture content and liquid-plastic index.The device has advantages of high degree of automation,simple and easy operation and low cost,which can be widely applied to determination of limit moisture content for various soils and has a certain reference value for the design and implementation of agricultural engineering.
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Received: 12 December 2016
Published: 28 August 2017
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土壤界限含水率自动检测系统设计研究
为了解决传统土壤界限含水率检测中存在的需人工现场操作、耗时久、数据采集困难、数据传输实时性差等问题，设计了一种土壤界限含水率自动检测系统。该系统以西门子S7-200PLC为控制核心，由传送带、正方体容器、搅拌容器、电子秤、抹平系统、圆锥仪和加热箱等组成，使用MCGS组态软件进行数据监控，并采用采样烘干法测定含水率，液-塑限联合测定法测定液、塑性指数。实际应用中，该系统能够完成自动搅拌、多组数据同时测定和数据实时传送，基于含水率和液、塑性指数实现土体的分类以及地基土承载力的估算。该系统具有自动化程度高、操作简单及成本低廉的特点，能够广泛应用于各种土壤界限含水率的测定，对农业工程的设计和实施具有一定的参考价值。
关键词：
界限含水率,
采样烘干法,
液-塑限联合测定法,
S7-200PLC,
MCGS组态软件
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