The Research on Dynamic Measurement System of Bulk Material Flow

Basis on the mathematical model of dynamic measurement of bulk material flow which had been derived by authors,a dynamic measurement method of bulk material flow was proposed.A new dynamic measurement system of bulk material flow was developed.The practical use showed that the system can achieve the measurement accuracy of less than 0.25%.     

有源CC—RC滤波器和均衡器

Synthesis method of biquad filters using current conveyors (CC) and RC components is described. Second-order lowpass, bandpass, highpass, noton filters, and amplitude and phase equivalizers with CC-RC are obtained. These circuits are characterized by high     

饲料厂常用输送机械故障分析与预防

输送设备是大型饲料厂的通用设备，它直接影响饲料生产的效率及安全，需要在设计及选用输送设备时，充分考虑对其运行状态的监测及故障预防问题。为此，主要对从捷克TMS厂引进的输送设备所遇到的问题及原设计采取的一些措施进行了分析。     

煤矿皮带运输机断带保护电气智能控制系统的研究

针对带式输送机控制的缺陷,文章提出智能控制系统,有效解决了皮带断带和扰动的信号识别问题,从而杜绝了由于皮带运输中扰动信号引起非故障停机。     

温室穴盘苗自动移栽输送系统设计

近几年以目光温室和蔬菜大棚为主的设施蔬菜花卉产业发展迅速,但穴盘苗移栽作业仍以手工为主,使用的劳动力多,劳动强度大、作业效率低,要实现产业化生产,移栽作业必须实现机械化和自动化.在参考国外穴盘苗移栽机相关资料的基础上,对穴盘苗移栽输送系统进行了设计,包括穴苗盘定位输送装置的设计、花盆定位输送装置的设计、步进电机和光电传感器的选型等,并利用PLC完成厂输送控制系统的软硬件设计,最后试制了样机进行了性能测试.     

多功能马铃薯清选输送机的设计

针对国内马铃薯清选输送设备发展缓慢、严重制约马铃薯种植业的发展等问题,设计了一种多功能马铃薯清选输送机。当马铃薯和泥土及杂物的混合物输送到清选装置上方时,各松土轮即对马铃薯的混合物进行搅动和揉搓,使粘着在马铃薯上的泥土松动后,再输送到各清选辊上逐步清选,清除的泥土从各清选辊之间的缝隙落入泥土输送机上;清选干净的马铃薯被输送到分选装置上方时,小于两分选辊之间缝隙的小马铃薯落入小薯输送机上,大马铃薯则越过分选辊后落入大薯输送机上。本研究为马铃薯种植户提供了一款集清选、分选、多向输送和装载于一体的多功能马铃薯清选输送机,对解决农忙时节用工荒,推进马铃薯种植业的发展具有重要意义。     

Adventitious root formation of two <Emphasis Type="Italic">Abies</Emphasis> species on log and soil in an old-growth subalpine forest in central Japan

We assessed stem burial and adventitious root formation of two late-successional species, Abies mariesii and A. veitchii, in central Japan. In a plot (5 × 5 m), all seedlings between 8 and 24 cm tall were excavated: six A. mariesii seedlings in soil, and six and four A. veitchii seedlings in soil and on logs, respectively. For each sampled seedling, the number of terminal bud scars (TBS) was counted on the aboveground and belowground stems. Stem length was measured, and divided into aboveground and belowground stems. Among the three groups (A. mariesii seedlings in soil and A. veitchii seedlings in soil or on logs), there was no significant difference in height or total root weight (sum of adventitious roots and primary roots), but diameter at ground level and number of TBS were significantly different. Counting TBS on the aboveground stem of seedlings in soil underestimated seedling age, whereas the estimate was much closer to the true age for seedlings on logs. Seedlings in soil formed more adventitious roots than seedlings on logs. A large proportion of the stem was buried in humus for seedlings in soil, while most of the stem was not buried in humus for seedlings on logs. These results suggest that substrate affects adventitious root formation, the formation of which is important to shade tolerance. Thus, our preliminary results suggest that consideration of adventitious root formation is necessary to understand seedling bank dynamics and estimate seedling ages of these Abies species in spatially heterogeneous old-growth subalpine forests.     

基于Lab VIEW的苗盘输送控制系统设计

针对半自动移栽机移栽效率低的问题,设计开发了自动送盘系统。针对取苗机构位置固定,每次夹取1株钵苗的取苗方式,通过控制苗盘的横向和纵向间歇移动,实现钵苗逐个自动喂入,从而实现自动取苗。系统采用PC机作为上位机,由Lab VIEW构建控制系统操作界面;单片机作为下位机,接受传感器的检测信号和上位机发送的指令信号。试验验证表明:系统可以实时监测苗盘的运动位置和取苗工作状态,实现苗盘运动和机械手取苗的配合。     

U形筒螺旋输送机输送颗粒物料的离散元仿真

采用试验与离散元模拟相结合的方法,对U形筒和圆形筒螺旋输送机输送颗粒物料的动态过程进行对比研究。结果表明:1)U形筒和圆形筒螺旋输送机输送颗粒时都存在质量累积波动现象,波动现象都随着螺旋叶片的转速、螺旋输送机的倾斜角度增加逐渐减弱;2)螺旋输送机的倾斜角度在0~45°时U形筒的效率大于圆形筒,当倾斜角度超过60°后圆形筒效率超过了U形筒,另外输送效率并非随螺旋叶片的转速增加线性增大,而是当转速增大到一定值后趋于稳定;3)对比U形筒和圆筒螺旋输送机工作时颗粒在所受挤压力,位于进料口处颗粒受力最大,且在进料口处圆筒螺旋输送机大于U形筒,转速增加颗粒受力趋稳。     

原木锯材产品质量统检结果与讨论

经国家技术监督局同意,林业部组织了全国林业系统国有企业原木、锯材产品质量统检。通过对全国九个省（区）的林业系统国有企业原木、锯材产品质量统检,结果表明原木规格平均合格率９４．１３％,等级平均合格率９８．７８％,合格批次占８８．５０％,锯材规格平均合格率８７．６２％,等级平均合格率９８．５５％,合格批次占９２．８６％。