Abstract:  At present, there is no special equipment for dry heat treatment, and there are some problems such as poor temperature accuracy, low uniformity, and incomplete sterilization when using the ordinary oven for dry heat treatment of seeds. Using technologies like uniform heating, hot air circulation, and intelligent control, the seed dry heat treatment equipment is developed, mainly composed of box, pallet truck, heating system, and control system. By optimizing the structure, airflow and temperature distribution is uniform, and the seeds are evenly heated. The control system can automatically process the dry heat temperaturetime curve of different seeds, accurately adjust the heating power through PID, sense small temperature fluctuation, has high uniformity and controllable humidity, and can set 16 sections of temperature and store 10 treatment processes. The test results show that the equipment has better temperature control precision, small temperature fluctuation at a set temperature, a fast reaction at the heating and cooling stage, and a slight overshoot. At 100 ℃, the temperature uniformity is 1.34 ℃, and the temperature fluctuation is 015 ℃, which can completely sterilize and maintain the seed activity, meeting the needs of seed dry heat treatment.

Key words: seed, dry heat treatment, temperaturetime curve, uniformity, volatility

摘要： 针对目前没有干热处理专用装备，用普通烘箱对种子干热处理时温度准确性差、均匀性低、灭菌不彻底等问题，采用均匀加热、热风循环、智能控制技术，研发种子干热处理装备，主要由箱体、托盘车、加热系统和控制系统等组成。通过优化结构，使得气流和温度分布均匀，保证种子均匀受热。控制系统可按不同种子的干热温度—时间曲线自动处理，通过PID精准调节加热功率，实现温度波动小，均匀度高，湿度可控，可设置16段温度、存储10种处理工艺。测试结果表明，温度控制精度高，恒温时温度波动小，升温和降温时反应快、超调量小，在100 ℃时温度均匀度为1.34 ℃，温度波动度为0.15 ℃，可彻底灭菌并能保持种子活性，满足种子干热处理的需求。

关键词: 种子, 干热处理, 温度—时间曲线, 均匀度, 波动度