铸造阀体内腔的清理

我厂铸造的阀体(HT30～54)内腔,其结构复杂,工作压力高(280～320公斤/厘米~2),内腔通道不允许有极微小的粘砂和残留氧化物,清理较困难。现采用硅整流电阻加热式电化学清理,效果良好。     

一种管材抛丸防护盖

针对履带起重机臂架主弦管在抛丸工序,防止钢丸在抛丸时进入主弦管内径中,介绍一种管材抛丸防护盖。解决了主弦管抛丸工序后,难以清除其内部残留钢丸的问题。给出了防护盖结构及工作原理,依据管材的内径可设计成不同规格的管材抛丸防护盖,每种规格通过调节螺柱和调节螺母,适应一定直径范围的管材。以适用于主弦管内径Φ134~Φ180 mm范围的管材抛丸防护盖为实例,现场实际应用表明:该管材抛丸防护盖应用效果良好,在主弦管抛丸工序,有效地阻止了钢丸进入主弦管内径中,管材内部没有钢丸,不用清理。而且,防护盖的结构简单,制造成本低。     

推板上的弯销侧抽芯薄壁深腔壳体压铸模设计

由于铸件对成型铸件内腔的型芯包紧力大,将成型铸件内腔的纵向型芯设在定模,以便利用压铸机的开模力抽拔纵向型芯.动模设有异形弯销-滑块机构辅助控制铸件脱模顺序.中心浇口进浇,铸件质量好,生产效率高;模具两次分型,定模上的可动模板拉断浇口,固定于推板的弯销侧抽芯.模具结构紧凑,工作可靠,操作方便.     

内热式电化学清理成套设备及其应用

内热式电化学清理成套设备是内流道铸件清理的首选设备,属国内首创.对该设备的主要技术参数、工艺流程及主要设备构成,设备的结构特点、应用效果进行了分析比较,并就实际操作中的工艺参数制定及操作注意事项进行了阐述.     

Q3920型通过式抛丸清理机通过鉴定

我室一组设计的Q3920型通过式抛丸清理机,于1985年12月通过鉴定。该机于1982年完成设计后,由青岛铸造机械厂制造,1985年在青岛造船厂安装调试成功,投产使用。从而填补了国内板材和型材除锈强化标准清理设备的一项空白。 Q3920型通过式抛丸清理机适用于锅炉、船舶、汽车、机车车辆、工程机械和化工设备等制造行业。对不同形状规格的钢材,进行表面除锈和强化处理,能改善焊接性能,提高喷涂质量。该机清理钢材的范围如下。板材B(宽)<2000mm L(长)=8000～12000mm     

液压阀清洁度控制探讨

液压元件在加工和装配过程中残留于内部的污染是造成液压系统早期失效和故障的主要原因。章从液压阀阀体铸件的清理、去处机加工毛刺、试验台油液的过渡三方面论述了提高液压阀清洁度的方法。     

钢结构抛丸(喷丸)清理用金属磨料的对比分析

对钢结构涂装防腐过程中 ,钢材的抛丸 (喷丸 )清理 (除锈 ) ,即钢材预处理过程所用金属磨料的种类、硬度、显微组织、磨料材料的颗粒形状、粒度分级、宏观、微观组织及密度作了对比分析 ,指出了判断金属磨料质量的简易方法及正确选用磨料的原则。     

探讨玉米种子安全储藏分析

<正>1、清理仓库清理仓库是保证玉米种子安全储藏的一个重要步骤,由于玉米种子将长期储藏在仓库中,因此仓库的清理便变得十分重要。对仓库进行清理主要应从仓库内部和仓库外部两方面来处理。对于仓库内部的清理主要围绕清理仓库内部的种子残留、杂质及垃圾等步骤进行,而对仓库外部的清洁则主要围绕清除仓库外部的杂草、排除仓库外部的污水等进行。务必要保证仓库内部和外部来两方面的清洁,只有这样才能使玉米种子得到更好的保存。     

GYSPW2080型路面抛丸整形机及抛丸整形处理工艺的应用

路桥表面的抛丸整形处理是国内道路交通行业近几年新兴的一种先进的表面处理施工j工艺，该工艺技术的实施需要专用养护设备——路面抛丸整形机完成。从路面抛丸整形机的基本I：作原理m发，介绍GYSPW2080型路面抛丸整形机的结构组成、基本特性、关键技术，以及抛丸整形处理_r艺的应用范围、基本施工要求等。工程实例证明抛丸整形处理设备及工艺可以达到令人满意的应用效果，建议将路桥表面抛丸整形处理工艺技术在国内推广应用。     

高工作压力喷丸缸本体系列设计

喷丸缸是表面喷抛丸清理工艺中的重要设备。本文对高工作压力喷丸缸本体系列设计作了可行性分析之后,进而从设计参数的确定、结构设计、设计计算、规格参数、设计特点诸方面作了叙述。     

An automatic system for pressure control and load simulation of inflatable membrane structure

Inflatable membrane structure employs flexible membranes as main constructive materials, as well as pressurized gas in the membrane envelope aiming to provide the bearing capacity and structural integrity. Therefore, the internal pressure control and load simulation method are very significant to estimate the structural behavior of inflatable membrane structure. This paper presents an automatic system for pressure control and load simulation of inflatable membrane structure, including a pressure control subsystem and a load simulation subsystem. For pressure control, internal pressure of inflatable membrane structure is controlled by switching the high-speed on/off valves which connect air compressor to the structure. For load simulation, wind pressure and wind suck loads, acting on membrane surface in the normal direction, are simulated by controlling the solenoid valves to allow the vacuum pumps to inflate air into or pump air out from the load simulation chamber which is closely connected to inflatable membrane structure with an airtight space. More importantly, the coupling control of two subsystems can be automatically carried out to simulate the inflatable membrane structure under resisting the varied wind loads. These above actions are automatically performed based on the control logic coded in software module. In order to estimate the proposed automatic system, the internal pressure control, load simulation and coupling control tests were performed on a square double-layer ETFE (ethylene tetrafluoroethylene) cushion model. Control performance and accuracy of the proposed system are proved by analyzing the measured pressures. It is thus demonstrated that the proposed automatic system is considerably automatic, accurate, efficient and reliable for pressure control and load simulation of inflatable membrane structures.     

计算机自动控制液压技术在桥梁整体安装工法中的应用

本文通过北京昌平西关环岛桥梁改造这一国内首次桥梁上部结构整体置换工程案例的主要实施过程,详细介绍了自行式运梁车、均载系统、同步顶升千斤顶系统、提梁机、万向千斤顶等分别采用不同功能的计算机自动控制集成液压技术。基于计算机有限元软件对空间异形结构各工况施工过程受力状况的精确分析和验证,结合计算计算机自动控制液压顶升技术在旧梁使用过程中支护、旧梁移动运输、旧梁提降破碎、新梁整体称重、新梁整体运输、新梁精确整体就位等关键工序中应用,满足支顶系统在异形板各支点反力差异大情况下的自动调整适应、保持梁体变形在移动过程中路线纵横坡度变化下的有效控制,是新工法得以顺利实施的重要前提。     

锯铣加工生产线计算机网络控制系统设计

介绍了用于塑钢门窗制造的锯铣加工生产线的基本组成及计算机网络控制系统的设计。该加工生产线采用工业控制计算机作为主机，PLC作为从机的网络控制体系结构。工业控制计算机能够实现自动检测、编程、与PLC实时通讯等操作；三台PLC分别完成自动输料及机械手单元、自动铣削机单元、自动锯切机单元的控制，并与工业控制计算机实时地通讯。该生产线实现了锯铣组合自动生产加工，具有可靠性高，现场灵活性强，程序设计简单等优点，显著提高了生产效率和加工质量的稳定性。     

Development of a control system for a multipurpose road repairing machine

In this paper an automatic control system for a multipurpose road pavement repairing machine (ROADMOTO) is introduced. The goal is to achieve cost savings and better work quality by means of automation. Before the actual repair work a GPR (Ground Penetrating Radar), a profilometer or laser scanning techniques are used for collecting information about the road. During the design phase a repair design file is created. The ROADMOTO machine is equipped with a GPS positioning unit and the repair design file can be used for automatic control of road repairing operations. The control system also offers a manual control mode as well as automatic height and slope control modes. This ensures flexibility, because the user can choose the control mode that best suits the situation. The process from data collection and design to automatic machine control is presented as well as the developed prototype system and results of the first tests.     

数控三工位大型高压瓷套修坯机组的研制

研制出一种适用于等静压干法加工工艺的新型结构数控三工位大型高压瓷套修坯机组。机组的三台加工设备采用星形排列,上坯机设在机组中心,实现各个加工机床间坯件的换位和定位。电气控制系统采用编程控制器(PLC),实现手动和自动控制。实践证明,该机组的噪音为71dB,粉尘泄漏量为33.1m g/m 2,实际产量为每天两班生产11根坯件,达到了设计要求。     

Self-traveling robotic system for autonomous abrasive blast cleaning in double-hulled structures of ships

The aim of this paper is to propose the design, simulation, manufacture, and experimental validation of a new robotic system for fully automated blast cleaning in the double-hulled block. The entire robotic system consists of a new type of manipulator for the blast cleaning of the entire transverse web floors, and a specially developed 6-dof RRX mobile platform for self-traveling within the application area. The full cross section of the robotic system should be small enough to be placed inside the double-hulled structure, via a conventional access hole of 600 × 800-mm, from the outside shipyard floor. Moreover, the maximum height of the structures has a range of, typically, 2-m to 3-m, and the robotic platform is able to be located on the longitudinal stiffeners at a height range from 400-mm to 800-mm. Thus, the investigation of a customized manipulator, having a bi-directional stroke in order to approach the upper sections, is a most worthwhile subject in the automation of the shipbuilding process since such a system should be capable of carrying out continuous blast cleaning from the upper to the lower sections at one time, without the need for any additional operations.Throughout the field testing, significant results have been obtained, indicating that the new proposed system can successfully perform continuous blast cleaning for the entire transverse web floor and the longitudinal stiffeners without any dynamical instability of the robot platform. Proposed robotic platform, will bring great benefits to ship yard automation.     

陶瓷平板膜与PVDF中空纤维膜在MBR中的应用

通过搭建MBR膜性能评价平台,开展膜组件性能评估,以新型陶瓷平板膜为主体,与国内主导型膜材料产品进行性能对比研究,监测长期运行过程中膜通量变化、在线清洗频率、膜曝气强度、离线清洗周期等参数,并对膜的抗污染性能及陶瓷平板膜的清洗方式进行了分析。结果显示,在维持定期在线反冲洗、在线化学清洗的情况下,陶瓷平板膜的离线清洗周期大于6个月,形成的膜污染主要以对NaClO溶液更为敏感的有机物污染为主,而酸性清洗剂较易洗脱的无机物污染少;较高的清洗液温度、较长的浸渍时间,均有利于膜通量的恢复。将陶瓷平板膜用于实际工程中发现,出水COD和石油类物质均能达到回用水水质标准。     

MBR的在线超声清洗效果及对混合液性质的影响

将超声波用于膜生物反应器（MBR）的在线清洗,考察了对膜污染的控制效果以及在线超声清洗对混合液性质的影响。结果表明,在线超声清洗对膜污染具有良好的控制效果,但会引起污泥总活性降低,平均污泥粒径减小,过滤性能变差;超声空化作用对硝化活性的影响要比对有机物分解活性的影响大;超声功率和超声时间对混合液的性质影响较大,超声功率越大或超声时间越长则对混合液性质的影响越显著。为避免混合液的性质过度恶化,在线超声清洗的功率不宜过大,每次清洗的时间以5 min左右为宜。     

给水工程自控仪表设计中若干问题的分析及对策

在给水工程自控仪表设计中出现了新老系统衔接、加氯间设备控制、水质检测仪表设置等问题,文章针对这些问题给出了解决方案,可以为类似的水厂自控仪表设计提供参考。     

浮法玻璃自动配料系统

介绍的配料自动控制系统，采用德国西门子S7-300可编程序控制器组成下位机，工控机作为上位机，PANTHER仪表等组成的实用的自动配料控制系统。