基于PLC的步进电机转速控制方法研究

概述了PLC控制的优点、步进电机的工作原理。提出了一种基于PLC的四相步进电机控制方法,介绍了系统的硬件组成以及相应的I/O分配。软件设计包括脉冲产生和控制、脉冲分配及步数设定三大模块,用软件完成脉冲分配功能,可以减少硬件资源,控制参数改变方便灵活,提高了系统控制的可靠性和灵活性。     

Application of open-pit and underground mining technology for residual coal of end slopes

Given the conditions of residual coal from the boundary of a flat dipping open-pit mine,which uses strip areas mining and inner dumping with slope-covering,we propose an open-pit and underground integrated mining technology for residual coal of end slopes.In the proposal a conveyance road and ventilation conveyance near the slope are built,corresponding to the pit mining area and the surface coal mine dump,as well as an interval haulage tunnel and air-inlet tunnel.The outcome shows that such mining method may reduce the effect to slope stability from underground mining,it does not affect the dumping advance and has a high recovery rate of residual coal resources.The working face is timbered by single hydraulic props,transported by a scraper conveyor and supported by coal walls.This method of mining is one of layered top coal caving,with high resource recovery,low production cost where positive economic benefit can be realized.     

Surface characteristics and wetting mechanism of respirable coal dust

In this study,FTIR and XPS spectroscopy,specific surface area and pore size analyses,wetting and other experimental means have been applied to investigate respirable coal dust surface properties and wetting mechanism.The research shows that coal dust surface structures,chemical and element compositions are changed in the refining process of coal dust.Compared with large particle coal dust,respirable coal dust is a weak hydrophilic and strong hydrophobic substance.The reason:the smaller the particle size of coal dust,the more unsaturated its surface.The absorption of air is strong and it is easy to form an air film on coal dust surfaces.Coal dust contact with water is actually a compound contact of liquid in contact with a solid and gas in contact with a solid.The smaller the particle size,the larger the pore volume and the higher the degree of surface roughness,the larger the area of gas in contact with a solid and the worse the coal dust wettability.Another reason is that the changes in the composition of atoms on the dust surface and structures affect coal dust wettability.The results of this study establish a theoretical basis for the invention of effective reduced-dust technology.     

POLYFLOW逆向挤出功能在挤出方型物口模设计中的应用

以方型材挤出口模设计为例,建立了几何模型、数学模型及有限元模型。通过在POLYFLOW模拟软件中构建任务并定义各项参数,利用重新生成网格技术,进行了数值模拟和分析,得出如何有效应用POLYFLOW逆向挤出功能对方型材挤出口模进行设计。研究表明:POLYFLOW逆向挤出功能可以提前预测其变形倾向,提高了口模设计一次性成功率,缩短口模的开发周期,降低成本。     

载铜活性炭催化剂-微波法联用处理黄姜皂素废水

以硝酸铜为活性成分材料制备活性炭载体催化剂,采用载铜活性炭-微波联用的废水处理工艺,对黄姜皂素废水的COD降解效果进行了研究,并考察了催化剂用量、微波功率、微波处理时间、水样pH值、催化剂使用次数等影响因素。结果表明：在载铜活性炭的催化作用下,微波辐射处理能使黄姜生产皂素废水的COD迅速降低,去除率达到60%左右,明显优于单纯载铜活性炭或微波的处理效果。     

C#.Net平台下制图系统的底层开发

简要分析制图系统所应具备的基本系统功能,并采用组件式构架的思想,在C#.NET环境下组织计算机制图系统的底层开发,实现计算机制图系统的基本功能。对系统开发的核心问题如系统框架设计,系统结构设计等内容进行探讨。系统采用组件式开发的思想,与当今主流的软件开发方式接轨。     

Preparation and crystallization action of SiO2 -Al2O3 -CaO-ZnO-R2O porous glass-ceramics

Using powder-sintering method,SiO2-Al2O3-CaO-ZnO-R2O porous glass-ceramics were produced for analysis. Five samples with different SiO2 /CaO ratios were used in the research. The mechanical properties, microstructures and textures of porous glass-ceramics are investigated by using differential thermogravimetric analysis/differential thermal analysis ( TGA/SDTA) ,X-ray diffraction ( XRD) ,and scanning electron microsco- py ( SEM) . The activity energy of crystallization ( E) and crystallization kinetics parameter ( k) were calculated based on the modified JMA equation. The Avrami parameter n was obtained according to Augis-Bennett function. The results show that the k value of No. 1 sample ( SiO2 /CaO = 61∶ 18) is the largest among all samples, which tends to crystallize more easily,and crystallization processes of all samples are observed bulk crystallization. The main crystal phase observed is parawollastonite ( clinorhombic system) with puncheon shape. Poreforming agents decomposed at 100 - 500 ℃ form a large number of closed pores with micron dimension and several semi-open pores distribute uniformly in the glass-ceramics matrix. This work may be expected to be favorable for industrial scale applications of porous glass-ceramics in the field of building thermal insulation.     

电磁管道抗垢装置的功放及回馈电路关键技术

分析比较了超声波防垢、机械去垢、管道化学酸洗、管道高压水射流清洗和电磁防垢的方法和效果。利用电磁防垢的防垢、除垢、杀菌和灭藻的功能原理,研制了嵌入式音频电磁共振管道抗垢装置。音频功率放大器件是装置的关键部分,既保证了足够的功率输出,又具有短路保护和过热保护作用。电路设计上,根据推动负载线圈功率信号的特点,将常规的线性功率放大电路改进成比较开关电路,有效降低了功放芯片的自身损耗。装置还通过线性光耦回馈负载线圈上的信号,进行峰值检测,经过微处理器运算后输出最佳频率,优化了管道抗垢去垢功效。     

Ug注射模设计系统在模具设计与制造中的应用

采用Ug Mold Wizard系统设计注塑模的工作流程,以及Ug Mold Wizard注射模具设计相关的模块,探讨了Ug Mold Wizard进行注塑模设计的具体设计流程和KBE知识工程的调用过程。借助计算机辅助扣板塑料模具设计及制造实例,得出Ug Mold Wizard在注塑模设计中的优化调用模具设计方案和仿真过程。该系统在注射模具设计与制造中的应用促进注射模具设计与制造的无纸化和产品短周期化进程。     

Numerical simulation study on the influence of the ground stress field on the stability of roadways

We adopt the concept of generalized plane strain to model a roadway in a stress field.This can avoid limitations caused by simplifying the stress analysis as plane strain.FLAC3D was used to investigate the maximum tensile stress and displacement of a roadway in a known stress field for angles,α,between the roadway axial direction and the maximum principal stress of 0°,30°,45°,60° and 90°.This theory was applied to the analysis of an engineering case.The results indicate that stress and displacement of the surrounding rock increase as the angle,α,increases.This provides some significant guidance for a reasonable layout of roadways in a known stress field.