Research On Grain Drying Moisture Detection Device Based On Thousand-Seed-Weight

Grain drying is an important part of grain storage, it is not only relative with the entire country's food security, but also affect its quality and processing characteristics. Grain moisture detection device is one of the key parts in drying equipment. As the existing water detection technology has a certain lag, which can not meet the online testing of drying process. The water detection can only be completed by artificial experience, which seriously restrict the automation level of drying equipments.Aiming at the problem of big errors in water detection, the peper presents a new method of water testing. The main contents and conclusions are as follows:Paper analysis on the basis of grain material, combined with water testing requirements, established the basis for measurement of grain moisture corn thousand-seed-weight method; and in uniform along the circumference of the wheel even out of socket single-grain cereal, a principle of design thousand-seed-weight measuring device, to achieve the automatic measurement of the thousand-seed-weight.Construction of the water testing of hardware systems, modular structure of the measuring system, simplify the design process. Include AT89C51 MCU, V / F converter module, signal conditioning module, serial communication module, motor speed control module. Related hardware and systems were selected.Using assembly language and virtual instrument technology to write procedures. Including the counting procedures, weight acquisition procedures and temperature measurement procedures. Programs are easy to change, flexible control, universal good. Through the corresponding experiments of thousand-seed-weight and water, gained large amounts of data, using excel, DPS and other software, to draw the data curve proceed linear regression analysis, verified the existence of their significant correlation, and obtained the functional relation.Construction of this thesis, the system can realize the measurement signal acquisition, storage and processing, display the weight value, calculated in accordance with the experimental data and obtained moisture, provide a basis for the drying process control. Using the device designed in this thesis, went on with four different varieties of maize thousand-seed-weight measurements. The results show that the error is less than±0.5%; using oven method to measure four different maize thousand-seed-weight and water, using excel, DPS and other software to draw the curves and proceed linear regression analysis, gained the function between thousand-seed-weight and water.