倾斜板组两侧腰子孔的作用及加工方法改进

介绍了倾斜板浓密机主要部件—倾斜板组两侧腰子孔的作用，优点和改进后的加工方法。

KMLYM-1200膏体斜板浓密机的研发及应用

为提高尾矿干堆及井下充填的工作效率,降低尾矿浆的处理及管理成本,提高尾矿浆的回水率,减少尾矿占地面积和安全事故的发生,云南科力环保股份公司研发设计了膏体斜板浓密机。该设备结合斜板浓密机单位占地面积澄清面积大及高效深锥浓密机底流浓度高的优点,大幅提高了设备的处理能力,增加了单位容积的固体通量,并有助于提高压缩层渗水率,释放出固体颗粒间的大部分水分,可形成似牙膏状的浆体;其浆体浓度接近或大于临界流态浓度,而小于极限可输送浓度,可持续集中到中心排放装置排出浓度较高的膏体。工业应用实例表明,该设备可高效稳定运行,可获得满足生产要求的高浓度膏体。

裙房大花架骑梁式吊篮施工技术

文章基于越秀国际金融汇裙房施工实例背景,探索大花架屋面骑梁吊篮安装施工工艺,采用骑梁后置钢板前支架、前梁、后梁、后置斜拉板组架,通过钢丝绳连接形成稳定的吊篮悬挂机构,取消了传统吊篮的配重及后支架装置,可实现建筑外立面外墙及幕墙施工的同时不影响裙房屋面施工,有效避免了界面施工冲突的难题。该技术在实际施工运用过程中大大降低了施工成本,且对施工整改率及施工进度有极大的提升。

Microstructure evolution and solidification behaviors of A2017 alloy during cooling/stirring and rolling process

A novel semisolid rheo-rolling process of A2017 alloy was achieved by combining the shape rolling mill with the vibrating sloping plate device. The microstructure evolution and solidification behaviors during the process were investigated. The high cooling rate caused by the sloping plate and stirring action caused by the vibration and metal flow lead to a high nucleation rate as well as two primary grain growth patterns, direct globular growth as well as dendrite growth and subsequent breakage, which causes the formation of fine spherical or rosette primary grains. During the rolling process, the grains of the strip were elongated. The primary grain size of A2017 alloy strip increases with the increment of casting temperature. When the casting temperature was between 650 °C and 660 °C, A2017 alloy strip with good quality was produced by the proposed process. The microstructures of the strip are mainly composed of spherical or rosette grains.

可调式浮沉切换固液分离装置

一种可调式浮沉切换固液分离装置,它包括在本体一侧的下端设有原水入口,在本体内置有溶气释放器、挡板、气浮与沉淀斜板组件、穿孔花墙、沉淀集水堰,沉淀集水槽和气浮集水槽,在本体上方设有刮渣机,其特点是:溶气释放器周围为气浮接触区。

Influence of plate length and plate cooling rate on solidification and microstructure of A356 alloy produced by oblique plate

A356 alloy melt solidifies partially when it flows down on an oblique plate cooled from bottom by counter flowing water. Columnar dendrites are continuously formed on the plate wall. Because of the forced convection, these dendrites are sheared off into equiaxed/fragmented grains and then washed away continuously by producing semisolid slurry at plate exit. Plate cooling rate provides required extent/amount of solidification whereas plate length enables necessary shear for producing semisolid slurry of desired quality. Slurry obtained is solidified in metal mould to produce semisolid-cast billets of desired microstructure. Furthermore, semisolid-cast billets are also heat-treated to improve surface quality. Microstructures of both semisolid-cast and heat-treated billets are compared. The effects of plate length and plate cooling rate on solidification and microstructure of billets produced by using oblique plate are illustrated. Three different plate lengths（200 mm, 250 mm, 300 mm） associated with three different heat transfer coefficients（1000, 2000 and 2500 W/（m2·K）） are involved. Plate length of 250 mm with heat transfer coefficient of 2000 W/（m2·K） gives fine and globular microstructures and is the optimum as there is absolutely no possibility of sticking of slurry to plate wall.

Microstructure and mechanical properties of Al-Mg_2Si composite fabricated in-situ by vibrating cooling slope

An innovative semisolid technique termed as vibrating cooling slope(VCS)has been applied to producing in-situ Al-25%Mg2Si(mass fraction)composite.The molten Al-16.5Mg-9.4%Si(mass fraction)alloy with 100°C superheat was poured on the surface of an inclined copper plate(set at 45°inclined angle)while it was vibrated at a frequency of 40 Hz and an amplitude of 400μm.After travelling the length of 40 cm on the slope,the resultant semisolid alloy was cast into a steel mold.For the purpose of comparison,reference composite samples were made by gravity casting(GC)and conventionally still cooling slope casting(CS)methods using the same alloy under identical conditions.The samples were hot extruded at 500°C.It was concluded that the size of Mg2Si particles was decreased by about 50%and 70%for the CS and VCS produced samples respectively when compared to that of the GC produced sample.Despite of their higher porosity contents,both the as-cast and hot-extruded VCS processed samples exhibited higher hardness,shear yield stress(SYS)and ultimate shear strength(USS)values as compared with their GC produced counterparts.These results were attributed to the refined and modified microstructure obtained via this newly developed technique.

Comparison of microstructure and wear resistance of A356-SiC_p composites processed via compocasting and vibrating cooling slope

The influences of SiC content on the microstructure, porosity, hardness and wear resistance of A356？SiCp composites processed via two different methods of compocasting and vibrating cooling slope （VCS） were compared with each other. In the as-cast condition, the matrix of VCS and compocast processed composites exhibited globular and dendritric structures, respectively. While a more uniform distribution of SiC particulates in the matrix alloy as well as higher hardness values were obtained for the VCS processed samples, the composites produced via compocasting exhibited less porosity. The increased SiC content （up to 20% in volume fraction） resulted in a more uniform distribution of SiC particles within the matrix alloy and improved wear resistance for both the composite series. However, for the VCS processed composites, the increased SiC content, resulted in the decreased size and shape factor of globules as well as better tribological properties when compared with compocast composites. It was concluded that the improved properties of the VCS processed composites when compared with their compocast counterparts was a consequence of a more uniform distribution of SiC particulates in the matrix alloy as well as the globular microstructure generated during the VCS process.