强力输送带全断面实时透视仪的图象显卡设置

中国矿业大学(北京校区)研制的强力输送带全断面实时透视仪，最初在386微机中采用了特制的图象处理卡VP12，并配有专用图象监视器CASPER，后来采用了ET6000显卡，皮带图象可直接在微机屏幕上显示。由于微机更新换代极快，一年后该显卡在市场上已很难买到，只好改为Trident9685显卡，而后又改用TNT2型等。每改换一次显卡，必须找出现卡驱程的原代码，从新编写显程，而原代码又很难找到。为了避免这种麻烦，采用了VBE标准编程，只要修改显卡的设置模式序号，程序就不用改写。本文详述了这一研制情况。     

多绳摩擦轮式提升机更换首绳工艺

多绳摩擦轮式提升绞车在煤矿生产中担负主要任务,由于提升首绳在工作中,要受多种应力的作用,易损坏,更换频繁,这就要求在更换首绳方面要采取快速、安全的方法及工艺。     

多小波阈值降噪法在钢丝绳缺陷检测中的应用

在介绍多小波理论和分析传统多小波阈值函数存在的问题的基础上,提出了一种新的多小波阈值函数. 详细地讨论了该函数的数学性质,该函数对大于阈值的小波系数采取缓变的压缩策略,压缩量随着小波系数的增大而减小. 将其应用于钢丝绳缺陷信号的降噪中,与传统多小波阈值函数的降噪进行了比较. 实验结果表明,该阈值函数降噪后重建信号的信噪比(SNR)高,能检测到钢丝绳缺陷信号中的全部小奇异点,其降噪效果优于传统多小波阈值函数法.     

变捻向钢绳生产

介绍捻向沿绳长交替变化的钢绳———变捻向钢绳的用途、构造、生产设备和捻制方法     

Water absorption and the effects of moisture on the dynamic properties of synthetic mountaineering ropes

Modern synthetic mountaineering ropes can take up more than 35% water in practical usage. This increase of weight affects their handling properties negatively. Furthermore, a wet rope runs the risk of icing. Moisture, on the other hand, affects also the dynamic behaviour of mountaineering ropes. The investigation of the water repellent effect of such ropes, however, is currently based on static test methods, which are unrealistic compared to practical usage. A new method for the moistening of mountaineering ropes, called Rope Working Simulator (RWS), has been developed that allows the moistening of mountaineering ropes in a more practical way than other methods do. With this equipment, the rope is sprayed with water, moved and bent around artificial carabiners to simulate effects of practical usage. After the treatment in the RWS, the ropes were tested dynamically according to EN 892 in order to quantitatively investigate their behaviour in the moist state. For a rope humidity greater than about 4%, the number of drops sustained decreases significantly and for a humidity greater than about 25%, the number of drops sustained can fall below the threshold value given by the standard (5 drops). This decrease is accompanied by an increase of the impact force, which can reach up to 12% for fully wet ropes.     

Theoretical and experimental investigation of effects of failures on the tensile endurance of elevator ropes

Elevators have an important place in human life just after uprising demands in high rise buildings, skyscraper and luxury residence concepts have surged. Steel wire ropes provide permanent working safety and reliability in the elevator installations. Due to this reason steel wire ropes are one of the vital components of elevators. In this study, effects of discard criteria such as wire breaks, abrasive wear and corrosion where extents of those failures are defined by ISO 4344 standard on the tensile endurance of 6×19 Seale and 8×19 Warrington elevator ropes have been investigated theoretically and experimentally. Tensile endurances of rope samples that have different extents of failure have been determined by using tensile testing machine and comparison is made by undamaged samples for each rope separately. In addition, stress and strain values occurred on the elevator ropes investigated have also been presented. The most critical failure type has been found to be 24 wire breaks for 6×19 Seale rope with fiber core where lifting capacity reduced by 25.99 %. The most critical failure type has been found to be abrasive wear which is 0.1 mm in depth along 100 mm length for 8×19 Warrington rope with independent wire rope core where lifting capacity reduced by 7.93 %.     

无锈蚀锚索的试验研究

无锈蚀锚索是探矿工艺研究所最近研制的一种新型非金属锚索。通过对国内外锚索索体、承压垫板、外锚具、附属零部件、张拉装置、锚索整体结构及锚索施工工艺的研究，以及两轮现场试验，结果表明无锈蚀锚索以其独特的性能，在特殊锚固环境中锚固，比钢锚索更有效、更可靠，因此具有极大的市场潜力。     

四绳无车槽摩擦提升实验分析

改变四绳摩擦提升机钢绳的连接方式或摩擦轮结构 ,可将双绳提升无需车槽的原理推广到四绳提升 ,通过实验证明 ,可使四绳摩擦提升免于车槽 ,绳衬的使用寿命成倍提高     

实施钢丝绳新国标的体会和建议

对照钢丝绳新老国标的变化,从范围、引用标准、分类、标记代号、原材料、技术要求、试验方法、判定规则、数值修约等方面进行分析,提出实施钢丝绳新国标的一些体会和建议,以利于钢丝绳新国标的贯彻实施。     

6T×19S+NF面接触钢绳的生产

股整体模拉拔法是生产面接触钢丝绳的一种技术。线接触股经约１５％的压缩率,一道次拉成需要的面接触股,被拉制股的捻距倍数与同结构线接触钢丝绳股的捻距倍数接近。为防止股内层钢丝凸出,各丝经矫直后进入整体模,合绳时减小股预变形量,加大钢绳的后变形量,采取这些措施即可正常地生产面接触钢丝绳