共查询到19条相似文献，搜索用时 390 毫秒
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针对木结构构件加工过程中依赖人工上下料码垛作业生产效率低的问题,提出采用可编程逻辑控制器（programmable logic controller,PLC）自动控制系统控制桁架式机械手承载真空海绵吸盘的方法,设计开发一种用于木结构构件自动上下料码垛作业的装置。装置应用在尺寸为2 387 mm×118 mm×152 mm（长×宽×高）的杉木结构构件的上下料码垛,作业效率为187根/h,上料合格率99.4%,下料合格率为99.2%。该装置能够实现木结构构件的稳定、高效、自动化上下料码垛作业,满足自动化作业的要求。 相似文献
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将建筑信息模型(BIM)技术应用于轻型木结构建筑工程中,结合轻型木结构框架体系的特点,针对木框架结构建模效率低容易出错等问题,基于Dynamo可视化编程平台开发了墙体和楼盖的快速建模参数化工具,通过调用建筑模型和输入结构参数便可快速自动地创建出轻型木结构框架。 相似文献
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集成材是用短小材沿纤维方向指接接长、再拼宽或层积胶合而成的一种长大材料。它可替代板方材,是制造中、高档家具的理想材料,被广泛用于建筑、家具、文体器材等方面。 1986年以来,我们承担了2项集成材方面的科研课题,对集成材的加工工艺、指接技术参数、胶合性能进行了系统研究,取得了一些可靠的数据,为集成材的发展奠定了理论基础。 相似文献
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现代木结构建筑绿色低碳，具有很强的环境适应性，近年来不断发展，具有广阔前景。我国严寒及寒冷地区（以下统称寒冷地区）的木结构建筑历史悠久，而建筑体系却因技术受限发展缓慢。以呼伦贝尔地区的木结构建筑为研究对象，通过对该地区寒冷气候条件下木结构建筑的发展历史、结构形式、建筑材料的选择进行探究，分析总结其建造特点和营造工艺,研究结果可为木结构建筑在我国寒冷地区的发展提供指导，有利于传统技艺的传承和保护，同时，对现代木结构建筑在新时期的设计提供理论和实践参考，推动木结构建筑的可持续发展。 相似文献
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【目的】节能环保理念越来越受关注,木材作为绿色环保的可再生建筑材料可应用在工程中,目前国内木建筑中应用的木柱主要局限于原木圆柱,为了提高木材利用率,同时降低成本,改善受力性能,满足工程需要,提出一种新型的空心胶合木柱,并进行试验研究分析。【方法】使用相同尺寸拱形锯材作为骨架,利用环氧树脂胶粘剂进行胶合,制作3根空心胶合木柱试件进行轴心加载受压试验,研究空心胶合木柱的轴压力学性能,在试验过程中通过仪器记录应变、应力和位移等数据,主要分析木柱的竖向与横向应变、竖向与侧向位移、稳定承载力等特性,并利用ABAQUS有限元软件进行建模对比分析,探讨木柱最终破坏特征。【结果】空心胶合木柱破坏形态主要是整体压屈破坏,达到极限荷载80%左右时,承载能力快速下降,侧向位移随荷载增加而迅速增大,加载过程中存在多个增长台阶;与同截面积原木圆柱比较,理论承载力提高了4.3%,计算得承载能力稳定系数为0.9,材料缺陷对轴心承载力有影响;通过有限元建模分析,材料在弹性阶段理论值与试验值吻合程度较好。【结论】空心胶合木柱应用在实际工程中是可行的,能够满足工程使用需求,充分利用小型锯材,提高了木材利用率,降低了成本,相较于原木圆柱受力性能更好。 相似文献
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Glued laminated timbers (glulam) or planks 50mm thick were added to structural steel columns and beams as covering materials. The wood used in the glulam was sugi (Cryptomeria japonica D. Don) laminated with resorcinol resin adhesive between woods and epoxy resin adhesive between wood and steel. The 50mm thick planks of sugi around the steel were fixed with spirally threaded nails (screws), and 25mm long wood plugs were used to cover the tops of the nails. The 50mm thick glulam showed 1h of fire resistance. The temperatures of the flanges and webs of steel were 100°C at 1h and 200°C after 4h. The epoxy resin used to bond the wood and steel was an appropriate adhesive from a recycling perspective because it is easy to separate or peel from the steel. 相似文献
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《Wood material science & engineering》2013,8(2):89-94
Abstract Nondestructive testing (NDT) can play an important role in improving the quality and reliability of tropical hardwood as an engineering material. By means of these methods, the stiffness of the material can be determined and the information used to improve its structural performance. Although, it is a usual approach for qualifying the material used to manufacture engineered wood products made mainly from softwoods, it is not so common for tropical hardwoods. Additionally, the lack of information regarding properties of glulam beam made from these kinds of wood is evident. In this context, the paper aimed at evaluating the theoretical and experimental deflection of glulam beams made from the Brazilian hardwood louro-vermelho (Sextonia rubra). Initially, the stiffness of each lamina was determined nondestructively using transverse vibration method (E dtv), which has been demonstrated to be the most suitable method for this wood species. Then, ten 5-lamina glulam beams were assembled according to descending lamina E dtv values. The experimental evaluation was performed using a four-point bending schedule. In general, the theoretical values of deflection were 2% higher than the experimental ones. The transverse vibration showed to be a suitable method to both measure lamina stiffness and predict glulam beam deflection. 相似文献
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方正林业局根据本局的经营方针,结合多年的木材检验管理经验。对产品质量的检查进行了改革。针对山上造材检验。装车复尺,卸车复检等三关进行了认真细致管理。作者认为把好这三关是提高木材产品质量的有效途径。 相似文献
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In this research, technological properties of glulam beams made from hydrothermally treated poplar (Populus deltoides) wood were investigated. Poplar wood blocks with dimensions of 6 (r)?×?10 (t)?×?73 (l)?cm3 were cut and hydrothermally treated in a stainless steel reactor at temperatures of 140 and 160°C for a holding time of 30?min. The treated wood blocks were initially air seasoned and then they were dried in a semi-pilot scale vacuum dryer to achieve moisture content (MC) of 12%. Conditioning of the treated and the untreated wood blocks was done prior to adhesive bonding. Afterwards the glulam beams (4 ply) were manufactured using polyurethane. In order to evaluate the physico-mechanical properties of the beams, density, equilibrium moisture content, water repellent effect (WRE), anti-swelling effect (ASE), mass loss (ML), wettability as well as surface roughness due to the hydrothermal treatment were determined in the treated wood and delamination, bond shear strength, tensile strength, MC and moisture-induced stresses as well as strains in cross-section of the beams were determined in the glulam beams. The results revealed that density, ML, ASE, WRE, modulus of elasticity, modulus of rupture and delamination were increasing and the others were decreased due to the hydrothermal treatment. 相似文献
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设计了一种基于三菱PLC控制的机械手,并将其应用于集材拖拉机的林木装卸作业.给出了系统总体设计框架. 相似文献
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针对目前胶合板等多层板排板生产大部分是手工排板的情况,设计了基于可编程序控制器控制的多层板连续排板自动生成设备.该设备主要完成自动计量、自动切割和自动运输等工作,具有生产效率高和节能等特点. 相似文献