共查询到20条相似文献,搜索用时 62 毫秒
1.
用PLC实现莲籽穿芯脱壳机的电气控制 总被引:1,自引:0,他引:1
根据莲籽穿芯脱壳机的工作原理,设计出了该机的控制系统.该控制系统是基于一台FX2N-48MR型的PLC来实现的.为此,介绍了系统硬件和软件的设计思想与实现过程、莲籽穿芯脱壳机手动控制和自动控制的工作过程,达到了莲籽自动穿芯脱壳的目的,收到了预期的效果. 相似文献
2.
3.
针对鲜食莲籽剥壳加工困难、损失率高的问题,设计了一种多通道集成式剥壳机构。该机构由多通道仿形凹槽轮、外刃齿板、内外刀盘等结构组成,可实现莲籽单粒排出、姿态调整与环切。仿形凹槽可保护莲籽避免因刀具切割、输送挤压而带来的破损。对剥壳机构工作过程进行理论分析和参数计算,确定了影响剥壳性能的主要结构和工作参数。采用EDEM离散元软件仿真分析了齿形结构、刃齿间距、齿间距、剥壳轮转速对莲籽排出、姿态调整的影响;采用ADAMS虚拟样机软件对莲籽在剥壳机构内的运动轨迹进行了仿真。根据理论计算与仿真结果完成了样机试制,并在样机上开展试验验证。以产自湖北省洪湖市的含水率大于64.2%的太空莲36号鲜莲籽为试验对象,以齿形、刃齿距、齿间距为影响因素,以剥壳率为评价指标,开展了三因素拟水平正交试验,结果表明对剥壳率的影响由大到小依次为齿形、齿间距、刃齿距,最优因素水平组合为向心齿、齿间距5 mm、刃齿距82 mm,在此条件下,剥壳率为97%。设计的剥壳机构能够满足乳熟期、蜡熟期莲籽剥壳的实际生产需要。 相似文献
4.
为提高电力安全生产水平,消除高压容性设备残余电荷对设备运维人员造成的威胁,分析了容性设备放电模型,提出了一种具接地自检与放电过程可视化的放电棒设计,该放电棒采用穿芯设计,便于拆卸;具有接地通路自检功能,保证了放电回路的导通;最终利用数据拟合算法实现了放电指示功能,极大程度提高了安全生产水平。 相似文献
5.
信息技术持续发展,电气控制系统智能化及自动化成为时代发展需求,电气控制系统自动化设计过程中要能够满足设计原则及专业电气控制系统需求,从而良好实现电气控制系统自动化。实现铁路企业现代化及科学发展具有重要的现实意义,以此实现机车网络控制系统设计尤为重要。基于此,本文就对机车网络控制系统主处理单元设计和应用进行分析。 相似文献
6.
7.
首先,对玉米脱粒机整体结构设计进行了分析和设计;然后,根据脱粒装置控制系统需求,设计了基于嵌入式的脱粒装置模糊控制系统;最后,从硬软件两方面采用ARM和模糊控制技术,实现了玉米脱粒控制系统。试验表明:玉米籽粒脱离率在97%以上,成功率高,破碎率在0. 53%以下,达到了预期设计的要求。该系统的稳定性和效率较高,对实现玉米脱粒作业具有重要意义。 相似文献
8.
多功能温度控制器研究的内容包括多功能温度控制系统的形成和工作原理,本文介绍了"基于单片机的温度控制系统"的设计及其相关内容.设计的主要内容是温度检测与控制系统中控制算法及输出驱动电路的实现. 相似文献
9.
10.
介绍了农产品冷冻库网络控制系统的结构及其特点,设计了基于模糊自适应整定的PID控制器,实现了对农产品冷冻库网络控制系统的控制。基于TrueTime仿真工具箱的仿真实验表明:设计的农产品冷冻库网络控制系统具有响应速度快、稳定性强和抗干扰能力强等特点。 相似文献
11.
12.
13.
14.
15.
《Journal of Agricultural Engineering Research》1998,69(3):249-254
A model to represent the discolouration of dried powder of carrots as a function of temperature was developed. Two types of carrots, Asian and European, containing large amount of lycopene and β-carotene, respectively, were tested. The dried powder was stored under an atmosphere with O2and at three different temperatures, 5,20 and 35°C. The surface colour of the powder was monitored during storage by a Hunter colour ratioa/b. In the proposed model, the rate of oxidation was assumed to be represented by the product of the fraction of concentration of oxidized pigment at arbitrary time and a specific rate of oxidation of pigment. The rate parameters in the proposed model were calculated by fitting the experimental data with smooth curves by trial and error at the end of the induction period but before discolouration took place. The frequency constant and activation energy, expressing the temperature dependence of the rate parameters, were expressed by the Arrhenius relation. The simulation results of a Hunter colour ratioa/bof dried powder at 25°C showed good agreement with the experimental data, suggesting that the proposed model was effective for the prediction of discolouration of dried powder of both types of carrot. The use of the induction period in the manner described may enable the shelf life of dried powder to be predicted. 相似文献
16.
感官检验棉花的品级,这是农村常见的一种检测手段.它的一个主要特点就是存在不确定性.这是由于检验员的品级检验水平存在一定的差异,其中有很多因素制约着检验的结果.文章对影响感官检验结果的因素进行了系统的分析. 相似文献
17.
18.
从灾害经济学的角度探讨了城镇供水优化调度的必要性和可能性,认为在缺水不可避免的情况下,对供水进行优化调度可以减小缺水带来的损失,产生较好的减灾效益,特别是可以大大减小严重干旱的灾害效应。并根据水资源的特性,提出了缺水损失的计算模式以及优化调度的原则和方法。 相似文献
19.
The fractional outflow rate of water from the rumen, measured as the rate of disappearance of the chromium complex of ethylenediamine tetra-acetic acid, was related to a number of dietary factors. A multiple regression equation was derived which expressed fractional outflow rate as a function of the intakes of dry matter, ash, acid-detergent fibre and crude protein.The data analysed consisted of 243 observations for sheep on 59 diets, including forage, concentrate and mixed diets. The ranges covered by the data were: fractional outflow rate 0.7–3.6 day?1; dry matter intake 560–1400g/day; ash 4–30%, acid-detergent fibre 7–41%, crude protein 5–26 % of dry matter; there were no observations for sheep of less than 34 kg liveweight.The equation accounted for 56·3 % of the total variance. Between-sheep variance could not be calculated for the whole of the data but was undoubtedly substantial since, for a sixth of the data, it was known to account for 38 % of the total variance. 相似文献