堆料机行走速度的确定

介绍了堆料机行走速度的确定方法和计算公式,指出预均化堆场用堆料机行走速度设计成可调速的反而使推料机的设计和操作变得复杂,因此可设计成恒速的,即正反向输送时堆料机的速度相同。     

预均化料场堆料机堆料层数和行走速度对均化比的影响

根据侧式悬臂混匀堆料机人字形堆料工艺的原理,分析了堆料层数和行走速度与混匀比的关系,提出满足n≥400及"混匀料堆每层每米长度的布料量(即单位长层吨)相等"这两个条件才能取得有效的均化效果。在工程实践中推荐了层数和实际速度的最佳实际解。     

预均化料场堆料机堆料层数和行走速度对均化比的影响

根据侧式悬臂混匀堆料机人字形堆料工艺的原理,分析了堆料层数和行走速度与混匀比的关系,提出满足n≥400及混匀料堆每层每米长度的布料量(即单位长层吨)相等这两个条件才能取得有效的均化效果。在工程实践中推荐了层数和实际速度的最佳实际解。     

采煤机用行走轮的几种齿形曲线初探

首先简介了五种齿形曲线的行走轮,着重对这五种行走轮的弯曲强度、接触强度及各种工况下的适应性进行了详细的分析。比较了五种齿形曲线行走轮的优缺点,并最终推荐对于需要较大牵引力的大功率采煤机,可以考虑使用复合曲线齿形的行走轮,以提高其质量和寿命。     

450t提梁机行走轮冒口工艺优化设计

1．行走轮工艺优化的目的铸钢件生产中普遍存在冒口大、收得率低的现状。如何减小冒口尺寸及数量,提高冒口的有效利用率成为铸钢件冒口设计的关键。     

基于蒙特卡罗法与赌轮规则的系统维修时间仿真模型研究

维修时间是系统维修性的重要指标，是进行系统维修性预计分配评估和验证的基础。研究了传统的维修性定量分析模型，分析了维修性定量分析模型在实际应用中的局限性，阐述了用蒙特卡罗法进行系统维修时间仿真的一般方法，提出了基于赌轮规则的维修路径选择算法，建立了系统维修时间仿真模型。结合某电源系统给出了应用实例，结果表明，建立的系统维修时间仿真模型对单个故障和多个故障引起的系统失效问题的维修时间仿真均可适用。     

120推土机支重轮和托带轮润滑油路的改进

红旗120推土机的支重轮和托带轮是行驶系统 的重要组成部分。常因备件紧缺、维修时间长、故 障频率高而影响正常生产。经过将支重轮轴和托带 轮轴油道扩大改进，延长了推土机的使用周期。 1.支重轮和托带轮功用及组成 支重轮用来支承推土机重量，并经履带把推土 机的重量传给地     

柱塞式喷油泵的维修

每次起动柴油机前都应检查喷油泵内机油量及其质量情况（靠发动机强制润滑的喷油泵除外）,确保机油量足够,质量良好。如果机油因混入水或柴油而变质,轻者造成柱塞及出油阀偶件的早期磨损,导致柴油机动力不足,起动困难,严重时造成柱塞及出油阀偶件的腐蚀锈蚀。液压泵内漏、出油阀工作不良、输油泵挺杆与壳体磨损、密封圈损坏,都会使柴油漏入油池而稀释机油,因此应根据机油的质量情况及时更换,更换时对油池进行彻底清洗,把油池底部的油泥等杂质清除干净,否则使用不长时间机油又会变质。     

常见阀门铸钢件的缺陷补焊

介绍了WCB、ZG250—485、ZG15Cr1Mo1V、ZGCrSMo、ZG35CrMo、ZGOCr18Ni9等常见阀门铸钢件的缺陷及补焊方法,缺陷的焊前与焊后处理,总结了缺陷补焊中经济、有效的实用经验。     

钢轨接口的焊接

唐钢冷轧薄板厂的桥式起重机钢轨以前采用预留间隙的夹板连接方法,此连接方法将钢轨直接固定在梁上,当受到振动、热胀冷缩等因素的影响易发生夹板松动使接口处错位,造成行走轮磨损或毁坏,严重威胁安全生产。现采用在梁与钢轨间铺胶垫板,钢轨接口焊接的无间隙柔性处理后,经一段时间运行,收到良好的效果。为安全生产和经济效益提供了保障。     

不锈钢的电火花表面强化

以1Cr18Ni9Ti不锈钢为基材,采用电火花堆焊技术,研究堆焊后微观组织和显微硬度的变化.结果表明,堆焊层晶粒比基体晶粒细小,显微硬度高于基体.电火花堆焊可以改善不锈钢的表面耐磨性.     

Overlap conduction laser welding of aluminium to steel

In the present study, a continuous wave fibre laser was used in conduction mode to join aluminium alloys to low carbon steel. Two different sets of experiments were performed: with Zn-coated steel and uncoated steel. Welding was carried out in overlap configuration with steel plate on the top aiming to conduct the heat through the steel and melt the aluminium at the interface, wetting the steel substrate. Metallurgical incompatibilities between these two participating alloys originate the formation of intermetallic phases. Therefore, restricting melting of the aluminium would limit the formation and growth of the intermetallic layer (IML). It was shown that the power density of the laser could be used such that, at the interface, aluminium only melts and the steel remains in solid state. The uncoated steel showed a regular pattern of IML formation, while the Zn-coated steel showed a different pattern of IML.     

Structure and performance of welding joint of Q235 steel welded by SHS welding

A self-propagating high-temperature synthesis (SHS) welding-pen that can weld steel workpiece from 6 to 10 mm is developed and welds the Q235 steel. The structure and properties of the welding joint are studied. The result indicates that this type of welding is melting and the fusion zone is clear. The tensile-strength of the welding joint is 283 MPa, flexural strength is 628 MPa, impact toughness is 46.43 J·cm⁻², and the microhardness of the welding joint and fusion zone are 230 HV_0.1 and 255.6€HV_0.1, respectively. The mircohardness of the fusion zone and the welding line are higher than that of the matrix.     

Structure and performance of welding joint of Q235 steel welded by SHS welding

A self-propagating high-temperature synthesis (SHS) welding-pen that can weld steel workpiece from 6 to 10 mm is developed and welds the Q235 steel. The structure and properties of the welding joint are studied. The result indicates that this type of welding is melting and the fusion zone is clear. The tensile-strength of the welding joint is 283 MPa, flexural strength is 628 MPa, impact toughness is 46.43 J·cm⁻², and the microhardness of the welding joint and fusion zone are 230 HV_0.1 and 255.6HV_0.1, respectively. The mircohardness of the fusion zone and the welding line are higher than that of the matrix.     

针对工程料仓堵塞的一种机械式清堵方案

针对工程料仓下料堵塞现象分析了堵塞的原因和成拱机理,提出了一种机械式清堵解决方案,该方案可针对料仓不同部位的堵料分别进行清堵,并对该清堵方案的优缺点进行了分析。     

圆弧砂轮的修整和金刚笔的调整方法

介绍了磨削球轴承沟道用砂轮的修整方法及修整砂轮圆弧所用金刚笔的不同调整方法,对保证和提高球轴承沟道磨削质量和加工效率具有借鉴作用。