木材干燥窑集散控制系统

介绍了木材干燥窑集散控制系统的组成、工作原理及主要特点，提出了将现场总线技术应用于木材干燥控制系统这一发展方向。     

新型木材干燥检测控制系统设计

随着木材干燥技术的日趋完善,以往一些检测精度低、检测参数不完整的木材干燥窑测控产品已不能适应客户的需求,同时早期的木材干燥控制系统又出现了不能与新工艺紧密结合的问题.基于上述原因,哈尔滨宇达电子技术有限公司充分开展与高校的技术合作,开发了新型木材干燥窑自动检测控制系统.     

分布式木材干燥控制系统

随着自动控制技术和计算机技术的发展,木材干燥的生产由手工、经验向自动化、标准化发展已成为必然趋势。由于木材加工行业对木材干燥质量要求的提高,木材干燥后其含水率成为一个关键性的指标,如何能够保证干燥质量即保证含水率成为木材加工企业必须解决的一个问题。本文基于这一问题展开研究,在综合评价各种木材干燥方法的基础上,采用智能仪器的设计方法和手段,进行木材干燥分布式测控系统的设计。本研究为木材干燥系统提供了一种新型、实用、经济、可靠和高效的手段,可有效地控制木材干燥的各个环节,保证其干燥质量。1系统选择及工作原理…     

分布式木材干燥窑全自动控制系统

ＷＳＪ—ＭＧＫⅡ型分布式木材干燥窑全自动控制系统，用于以蒸汽为介质的木材干燥窑进行全自动控制，设计过程中优先选用国内成熟的及有标准依据的技术方案，系统的硬件结构具有灵活的分布式组合能力，可靠性强。鉴于林区维护能力较弱，电路的结构设计充分地考虑了可维护性。     

小型PLC网络在木材干燥窑控制系统中的应用

论述了基于HostLink网络拓扑的小型PLC网络控制系统应用于多座木材干燥窑的生产线自动监控管理。     

单片机在木材干燥控制系统中的应用

1 前 言 传统的木材干燥工艺一般采用电测理论确定温湿度系数,以实现干燥控制,其虽然比较直观,但缺点较多.随着单片机技术的不断发展,在木材干燥行业中也可以用单片机作为系统的核心处理部件。采用时间干燥基准,不但可克服传统工艺的缺点,有效地协调监测和控制,而且控制简单、功能强大、成本低、小巧实用.用户还可根据自己的需求添加外围电路及设备,开发出适合自己的智能电子产品.因此,单片机技术在木材干燥业中有着十分广阔的应用前景.     

LK型木材干燥过程电子智能控制系统

本文简要介绍一种应用计算机技术,采用系统集成方法组成的木材干燥过程控制系统,综合了继电器控制、仪表控制以及计算机控制的优点。该系统投资少,操作维护简单。生产运行结果表明,该系统控制精度达±１℃,其优越的性能价格比,得到了用户的好评,现已供应市场数十台套。     

双CPU在木材干燥窑智能化测试系统中的应用

介绍了采用双CPU结构设计的木材干燥窑智能化测试系统及软硬件实现方法。在该系统中,主CPU用于完成实时数据采集、数字滤波、动态补偿等前期任务;副CPU用于显示、通讯、温度补偿等工作。从设计角度解决了测量时序占用大量CPU时间的问题,而且以并行通讯方式也克服了串行通讯速度慢的缺点。经实验验证:该系统具有较高的测量精度、实时性强、使用方便、抗干扰能力较强,同时也减少了操作人员的劳动强度,提高了木材干燥效率。     

Stress-strain state of wood at kiln drying

Summary A model has been suggested which allows the calculation of stresses arising in kiln drying and humidification of wood, as well as the total residual strain, i.e. set strain _s, consisting of purely residual strain _r and the so-called frozen strain _f. Frozen strains arise under the operating influence of loading when the stiffness is increased because of a decrease in moisture content (or temperature) of the wood. The process of formation of set strains _s has been shown to depend on the history of loading, variations of the moisture content of the wood, as well as cooling of the section before the measurement of _s. The possibility of using set strain as a parameter of the state of stress of wood in kiln drying has been noted.Presented at the VIII. International Symposium on Fundamental Research of Wood. Warsaw, Poland, October 1990     

熏烟木材干燥窑的技术改造

熏烟木材干燥窑通过技术改造,干燥后的板材含水率均匀,应力小,周期短,干燥质量完全达到GB6491-1999《锯材干燥质量》标准。     

Development of kiln drying schedule severity indices for degrade control

Summary Severity of kiln schedules used to dry wood has traditionally been determined after the fact. As an alternative, analytical indices using integral calculus have been developed to rate kiln schedule severity. Theoretical justification is presented for the general form of an index as well as for several specific cases. Possible uses of this type of index are also indicated. The indices take into account the dry and wet bulb temperatures used throughout a schedule as well as the duration of application and points of application of each combination of temperature and humidity used.The assistance of the California Cedar Products Company, Stockton, California, and, in particular, Charles Berolzheimer and John Rhemrev, is gratefully acknowledgedThe authors are, respectively, Research Associate and Project Leader, Forest Products Laboratory, University of California, Richmond     

Development of kiln drying schedule severity indices for degrade control

Summary A previous article presented the theoretical development of analytical indices to rate the severity of kiln schedules used to dry wood. These indices take into account the dry and wet bulb temperatures used during a kiln schedule together with the points of application and duration of application of each combination of temperature and humidity used. Experimental data for several such indices are presented for collapse development during the kiln drying of incense cedar pencil slats. While promising, the results were inconclusive as to the use of a severity integral for prediction of the effect of different schedules or schedule changes on drying degrade. A lack of homogeneity in the test material confounded the results.The assistance of the California Cedar Products Company, Stockton, California and, in particular, Charles Berolzheimer and John Rhemrev, is gratefully acknowledgedThe authors are, respectively, Research Associate and Project Leader, Forest Products Laboratory, University of California, Richmond     

以加工剩余物作能源的端风机型木材干燥窑

阐述了以加工剩余物作能源的端风机型木材干燥窑供热装置的结构及工作原理。经3年多使用证明：该种结构干燥窑结构简单，投资省，热效率高，干燥质量好，干燥成本仅为常规蒸汽干燥窑的1/3。     

三通道刨花干燥机刨花干燥过程自动控制系统初探

文中对三通道刨花干燥机刨花干燥中被控对象的特性、过程控制的方法、检测仪表、调节控制器与调速系统进行了探索与研究。干燥机的热效率高、刨花终含水率均匀、形态好。     

Laboratory test for grouping tropical species for kiln drying

Summary A system was developed for grouping tropical wood species for kiln drying based on similar estimated drying times. Six tropical species were subjected to drying and water soaking tests; variables were test temperature and specimen thickness. Soaking time, specimen thickness, and test temperature were used in an empirical model to predict drying times. The capability of the model to predict drying times was considered acceptable based on an adjusted coefficient of determination equal to 0.929 and an average error of 14 percent. The overall capability of the method proposed for grouping tropical hardwoods for drying is considered promising and worthy of further investigation.     

Stochastic numerical model for conventional kiln drying of timbers

A numerical model that predicts the stochastic dispersion associated with industrial kiln drying of timber was adapted to conventional drying and evaluated with experimental data. The theoretical aspects of the model are briefly explained, a selection of the calibration parameters was carried out, and a new empirical dispersion factor is proposed to account for all unknown sources of random behavior. The model was calibrated with six experimental runs of western hemlock and amabilis fir (116mm² timbers) to an average moisture content (target) of 14%–20%. It was found that with implementation of the dispersion factor, the number of required simulations is considerably reduced, the calibration results are consistent for all the experimental runs, and the target moisture content along with its standard deviation can be well reproduced using the all-run average parameters.     

多规格木板自动码垛机控制系统设计与实现

为了实现对一种错位双链木板循环输送码垛机结构的多传动系统协调控制,以提高木板的码垛效率,满足多规格木板码垛需求,设计了一种多输入多输出的木板码垛柔性控制系统。基于分模块控制系统设计理论,以PLC及扩展接口为核心,多激光传感器和触点开关为反馈信息输入,协调控制不同传动系统的多个电机,以实现木板的输送、规整和码垛。通过样机的试验,所设计的控制系统功能完整、性能稳定,自动化木板码垛比人工码垛效率高、效果好。     

橡胶木的防腐及干燥

橡胶木作为商品材具有双重经济价值，在木材利用方面因其易受真菌和昆虫的侵蚀，妨碍了对其材质的使用。现从木材干燥的角度论述：如何最大限度地减少真菌的产生和昆虫的侵蚀，合理地利用橡胶木。