Revisiting the pallet loading problem using a discrete event system approach to minimise logistic costs

This paper presents a new challenging modelling approach to support different heuristics to tackle the pallet loading problem (PLP). A discrete event system model to tackle the PLP is specified using the coloured Petri net formalism in order to integrate the model with the industrial context in which the PLP must be solved. New events can be formalised in the model to implement different heuristics to consider the upstream (production) and downstream (transport) influence of the palletising activity in the logistic flow. A state space analysis is performed to evaluate the different solutions to fit the maximum number of boxes on a rectangular pallet, supporting the inherent box diversity (heterogeneous palletising problems) of present production and distribution logistic systems. The heuristics implemented show that acceptable occupancy results can be obtained without requiring the exhaustive evaluation of the different feasible combination. The results demonstrate that it outperforms other approaches which have been suggested for this type of problem. Potentially useful extensions of the work are discussed.     

面向客户定制需求的塑料平托盘模块化设计

分析塑料托盘客户需求特点、设计中存在问题及模块化设计技术的应用现状,提出面向客户定制需求的塑料平托盘模块化设计方法的必要性。通过塑料平托盘结构分析及依据模块化等相关理论,对塑料平托盘结构进行模块划分;由塑料平托盘客户需求确定其客户定制需求以及塑料托盘客户定制需求结构模型。最后提出面向客户定制需求的塑料平托盘模块化设计方法及制定相应设计流程。图5参10     

托盘包装上浆鸡肉片冷藏中品质的变化研究

以冷鲜鸡的胸脯肉为原料加工上浆鸡肉片,装入托盘,置4℃条件下冷藏,序时测定其细菌菌落总数、TVBN含量、pH值的变化并作感官检验,结果在放置96h时,细菌菌落数2.1×104cfu/g,肉浸汁TVBN含量16mg/100g,pH值为6.3,超过标准值。对其细菌菌相的鉴定分析表明,由肠杆菌(Enterobacter)、乳酸杆菌(Lactobacillus)、假单胞菌(Pseudomonas)构成腐败菌相,其中假单胞菌为优势菌,最终由假单胞菌和肠杆菌履行腐败变质。在此基础上拟定出上浆鸡肉片托盘包装制品4℃下冷藏的适宜保质期为84h。     

带式烧结机台车起拱的力学分析及仿真

针对带式烧结机台车在尾部回程道的起拱问题,对尾部台车的力学关系进行了分析,得出了带式烧结机台车不起拱条件下的力学控制阀值;利用ADAMS软件,建立了450 m2带式烧结机的虚拟样机且进行了动力学仿真,得出了尾部回程道下台车及台车列力值曲线。通过力学阀值进行虚拟控制,达到了无起拱目的,证明了阀值公式的正确性,从力学角度揭示了带式烧结机起拱原因。该研究结果可为今后带式烧结机的工程设计及应用提供理论依据。     

热塑性蜂窝板封边机的研发与应用

针对热塑性蜂窝板的特点,通过实验研究,验证了利用热塑性蜂窝板面层材料的热压成型进行封边的可行性和实用性,封边效果既美观又耐用,既环保又经济。成功设计开发出一款适用于热塑性蜂窝板封边的封边机,可实现高效自动化封边。成功开发出利用热塑性蜂窝板封边机封边的蜂窝托盘产品,促进了热塑性蜂窝板在物流行业和家居行业的应用。     

基于视觉自主移动叉车货盘识别方法研究

讨论了几种常见的货盘识别算法并对其适用情况和性能进行了分析,提出了一种基于货盘颜色和货盘底边角点特征的算法.算法采用由粗到细的检测策略:提取货盘颜色,对货盘候选区域进行预检测,提取最长的货盘底边,利用角点确定货盘位姿.指出了基于视觉的货盘识别方法未来的研究重点:鲁棒性的视觉识别技术和快速识别方法.     

基于ANSYS Workbench的轻质托盘承载性能分析

应用ANSYS Workbench软件对航空轻质托盘的承载性能进行分析,得到了托盘在静载下的应力、应变数据,并通过Fatigue Tool模块模拟运输过程中托盘在不定振幅载荷作用下的受损情况。通过托盘的有限元分析为其后续设计中在结构上优化提供了依据。     

基于VBA包装装备零部件参数化图库的开发

针对当前包装机械设计制图的现状和缺点,分别以曲面手柄和联运平托盘为例,详细分析了基于VBA二次开发工具在AutoCAD平台上进行包装装备零部件参数化图库开发的具体方法与步骤,方法简单高效,显著提高了包装装备的绘图效率。     

木质托盘铺板的受力分析与设计

针对木质托盘在储存和运输过程中容易出现铺板受损的问题,进行典型工况下托盘的受力分析,建立铺板在几种常见工况下的受力模型并确定了挠度方程.根据托盘的许用刚度要求,提出了铺板在多种载荷条件下的设计方法,为木质托盘的设计和生产应用提供理论依据.     

A kinematic model for machine tool accuracy characterisation

A method for characterising machine tool accuracy is presented in this paper, using a compact quasi-static error model of a three-axis horizontal machining centre. Rigid-body kinematics and homogeneous coordinate transformation were used in this model. A metrology pallet was designed so that coefficents in the error model can be updated periodically. Ten measurement points were allocated on two perpendicular planes of the metrology pallet. One of the measurement planes was on the work table and the other was perpendicular to the table. Two different length touch trigger probes were required for error measurements. Establishing or updating the error model can be carried out in-process without disturbing the workpiece setup. The proposed compact error model is an improvement over past work for a production environment because of its robustness and convenient calibration procedure. The error model was tested in two dimensions and a good error prediction capability was observed in warm machine states.