Theory,technology and application of grouted bolting in soft rock roadways of deep coal mines

The grouted bolt,combining rock bolting with grouting techniques,provides an effective solution for controlling the surrounding rock in deep soft rock and fractured roadways.It has been extensively applied in numerous deep mining areas characterized by soft rock roadways,where it has demonstrated remarkable control results.This article systematically explores the evolution of grouted bolting,covering its theoretical foundations,design methods,materials,construction processes,monitoring measures,and methods for assessing its effectiveness.The overview encompassed several key elements,delving into anchoring theory and grouting reinforcement theory.The new principle of high pretensioned high-pressure splitting grouted bolting collaborative active control is introduced.A fresh method for dynamic information design is also highlighted.The discussion touches on both conventional grouting rock bolts and cable bolts,as well as innovative grouted rock bolts and cables characterized by their high pretension,strength,and sealing hole pressure.An examination of the merits and demerits of standard inorganic and organic grouting materials versus the new inorganic–organic composite materials,including their specific application conditions,was conducted.Additionally,the article presents various methods and instruments to assess the support effect of grouting rock bolts,cable bolts,and grouting reinforcement.Furthermore,it provides a foundation for understanding the factors influencing decisions on grouted bolting timing,the sequence of grouting,the pressure applied,the volume of grout used,and the strategic arrangement of grouted rock bolts and cable bolts.The application of the high pretensioned high-pressure splitting grouted bolting collaborative control technology in a typical kilometer-deep soft rock mine in China—the soft coal seam and soft rock roadway in the Kouzidong coal mine,Huainan coal mining area,was introduced.Finally,the existing problems in grouted bolting control technology for deep soft rock roadways are analyzed,and the future development trend of grouted bolting control technology is anticipated.

Application of high-pressure water jet technology and the theory of rock burst control in roadway

This paper puts forward using high-pressure water jet technology to control rock burst in roadway, and analyzes the theory of controlling rock burst in roadway by the weak structure zone model. The weak structure zone is formed by using high-pressure water jet to cut the coal wall in a continuous and rotational way. In order to study the influence law of weak structure zone in surrounding rock, this paper numerically analyzed the influence law of weak structure zone, and the disturbance law of coal wall and floor under dynamic and static combined load. The results show that when the distance between high-pressure water jet drillings is 3 m and the diameter of drilling is 300 mm, continuous stress superposition zone can be formed. The weak structure zone can transfer and reduce the concentrated static load in surrounding rock, and then form distressed zone. The longer the high-pressure water jet drilling is, the larger the distressed zone is. The stress change and displacement change of non-distressed zone in coal wall and floor are significantly greater than that of distressed zone under dynamic and static combined load. And it shows that the distressed zone can effectively control rock burst in roadway under dynamic and static combined load. High-pressure water jet technology was applied in the haulage gate of 250203 working face in Yanbei Coal Mine, and had gained good effect. The study conclusions provide theoretical foundation and a new guidance for controlling rock burst in roadway.

3D Design and Analysis of Crushing Roller of High-pressure Grinding Roller

Crushing roller is one of the main parts of High-p re ssure Grinding Roller, which is a kind of high efficient ore crushing equipment. A kind of assembled roller, which is more convenient to renovate worn surface b y simply replacing segmented surface of the roller, was developed. The structura l models of assembled roller’s components were designed with SolidWorks softwar e based on feature modeling, these solid models of the roller were virtually ass embled. Through this work, not only was the assemble interference checked out so as to examine validity of the structure design, but also these solid models cou ld be recognized by COSMOS/Works software, through which the finite element an alysis can be done. Then the stress and displacement of the main shaft and sur face segment in two different working states were analyzed and detected quickly according to the analysis results with COSMOS/Works. In conclusion, the optimum clearance of 1.0～2.0 mm between concave-convex studded segments is determined to make the using life of assembled roller longer.

Study of Multi-Function Micro-Plasma Spraying Technology

A multi-functional micro-arc plasma spraying system was developed according to aerodynamics and plasma spray theory. The soft switch IGBT （Insulated Gate Bipolar Transistor） invert technique, micro-computer control technique, convergent-divergent nozzle structure and axial powder feeding techniques have been adopted in the design of the micro-arc plasma spraying system. It is not only characterized by a small volume, a light weight, highly accurate control, high deposition efficiency and high reliability, but also has multi-functions in plasma spraying, welding and quenching. The experimental results showed that the system can produce a supersonic flame at a low power, spray Al2O3 particles at an average speed up to 430 m/s, and make nanostructured AT13 coatings with an average bonding strength of 42.7 MPa. Compared to conventional 9M plasma spraying with a higher power, the coatings with almost the same properties as those by conventional plasma spray can be deposited by multi-functional micro-arc plasma spraying with a lower power plasma arc due to an improved power supply design, spray gun structure and powder feeding method. Moreover, this system is suitable for working with thin parts and undertaking on site repairs, and as a result, the application of plasma spraying will be greatly extended.

生物质成型技术及LH-600型生物质颗粒成型机设计

针对大型养殖场固体粪污、生物质秸秆、茶园茶梗、果园枝条、木屑及蘑菇渣等农业固体废弃物资源化利用过程中,生产生物质颗粒存在产量过低、设备故障率高、易堵塞模孔和成型率差等问题,研发设计了LH-600型生物质制粒成型机。对成型机喂料装置、颗粒成型装置、动力传动机构进行了创新设计,并利用Solidworks软件进行辅助设计。试验、工程实践应用表明,成型机具有使用寿命长、维护成本低、传动机构润滑降温效果好及高效节能等优点,适合大中型饲料加工厂、养殖场及有机肥厂使用。

对链条零件加工工艺的探讨

现阶段,链条在动力传动中得到了大规模的应用,特别是在速度不高、功率强,以及温、高压、多尘等恶劣环境中。为防止链传动过程中产生“弹性打滑”现象,需要杜绝链条长时间工作下出现的磨损情况,防止链条的传动平稳性受到干扰,在工作时生成附加载荷、振动与噪音等。本研究以滚子链为案例,探讨滚子链链条链板、套筒、销轴、滚子等零件的加工工艺,旨在分析加工链条零件的工艺,满足链传动动力传递标准。

AOPT联合滚针导入贻贝粘蛋白治疗玫瑰痤疮的临床观察

目的:观察滚针导入贻贝粘蛋白(Mussel adhesive protein,MAP)治疗联合超完美脉冲光(Advanced optimal pulse technology,AOPT)治疗玫瑰痤疮的疗效及安全性。方法:纳入2022年3月-2022年12月就诊于笔者医院门诊玫瑰痤疮患者共60例,随机分为对照组和观察组,每组30例。对照组采用AOPT治疗,观察组采用AOPT联合皮肤滚针导入贻贝粘蛋白治疗,每4周治疗1次,共治疗3次。疗程结束后4周评价临床疗效。结果:两组均完成治疗。治疗后两组面部皮肤灼热、刺痛、瘙痒、紧绷症状均有改善,红色区计数均下降明显,差异有统计学意义,且观察组改善优于对照组(P<0.05)。观察组患者满意度明显高于对照组(P<0.05)。两组都未出现严重不良反应。结论:AOPT联合滚针导入贻贝粘蛋白治疗玫瑰痤疮有较好的疗效且安全性高。

尺寸偏差下的车身含胶滚边滚轮的位姿补偿

针对铝合金车身更严格的外观精度要求,提出一种面向车身尺寸偏差的滚轮位姿补偿方法。首先对尺寸偏差区间与胎模边线进行等距离散,得到尺寸偏差矩阵;然后基于Frenet标架与齐次坐标变换将尺寸偏差映射为滚轮位姿,得到滚轮位姿偏差矩阵;最后将滚轮位姿补偿量转化为滚轮位姿偏差矩阵行编号的调整量,得到补偿后的滚轮位姿。其中,滚轮位姿偏差矩阵由胎模曲面/曲线方程、滚轮倾角,以及FEM-SPH有限元仿真获得的尺寸偏差与TCP-RTP值的量化模型决定。实验结果表明,滚轮位姿补偿后的车身尺寸偏差平均值由0.32 mm降至0.14 mm。

面向调心滚子轴承的气动式主动抑振单元

滚动轴承在其服役过程中常用增加预紧力的方式来抑制其振动,但实际使用过程中轴承预紧力不会随外部工况的变化而变化,导致抑振效果有限或使轴承过早进入疲劳阶段。提出了一种气动式主动抑振单元,并开发与之相匹配的数据采集系统、测试控制系统及气压驱动系统构成主动控制单元;此外,设计了调心滚子轴承支承的细长挠性转子系统,用其一阶固有频率下的自激振动模拟实际工况下的载荷冲击,并采用主动控制系统对此冲击进行抑振。试验结果表明:该主动抑振单元对试验所用调心滚子轴承可满足常规转速及较高转速下的抑振要求,但转子转速在临近半频即1/2一阶临界转速附近时抑振效果不稳定且对轴向预紧力的幅值变化较为敏感。

重载荷高精度对辊成型机架的工艺研究

氰化钠对辊成型机属于重载荷高精度设备,对辊成型机架是其关键部件,其直接关系到氰化钠成型机的运行安全。针对氰化钠成型特殊使用要求,给出机架制造工艺的实例,从材料选用、焊接工序设计、焊后热处理、精密机械加工等方面阐述对辊成型机架的工艺设计要点,通过无损检测检验和用户使用验证结果表明,该成型机架工艺设计合理、可靠。

篦冷机托辊装置流水线装配工艺探讨

介绍了篦冷机托辊装置的结构特点、工作原理及制造装配的相关技术要求,分析了传统装配工艺存在的问题并提出了改进方案,详细阐述了托辊装置流水线装配工艺和液压辅助工装夹具的设计原理和生产流程,实现了篦冷机托辊装置装配工作的标准化和流水线式作业,装配质量和效率大幅提升,产品竞争力显著增强,具有较高的推广价值。

带内齿的谐波减速器专用交叉滚子轴承设计及其表面淬火加工技术

随着谐波减速器行业的不断发展,如何实现整机体积更小、重量更轻变得至关重要。利用一种交叉滚子轴承的新设计理念,将轴承与其他连接部件设计为整体结构,可实现谐波减速器整机轻量化的目的。在产品研制过程中,利用无软带表面技术,可实现滚道硬度高、齿韧性好的目的。

滚轴软压工艺耦合淀粉改性有机絮凝剂增效沼渣脱水工艺研究

本研究通过利用滚轴软压工艺耦合淀粉改性有机絮凝剂,开发一种新型的沼渣脱水技术,通过测定真空抽滤泥饼含水率、含固率和沼渣比阻等指标,评价不同淀粉和有机絮凝剂的比例及投加量对沼渣脱水性能的影响。结果表明,在比例为1∶0.5、投加量为0.4mg时淀粉改性有机絮凝剂使得沼渣的含水率下降至67.4%,过滤比阻下降了约63.6%,沼渣的脱水性能得到显著提高。分析调理前后的污泥ζ电位变化,发现沼渣|ζ|电位降至0.53 mV。通过改进传统辊压脱水技术,探究绝干量、进料固体含量及絮凝剂浓度,滚轴与滤膜之间的接触面积和挤压压力对脱水率的影响,得出最佳脱水工艺为:摩擦面积0.314 m^(2),挤压压力5 kg,绝干量33.3%,进料固体含量0.6%,絮凝剂浓度0.2%,可以使沼渣含固率达到39.63%,为该技术推广应用提供相应的工艺参数。

带式输送机防跑偏托辊的改造研究

西山煤电集团西曲矿井下工作面带式输送机主要采用防跑偏托辊来保证皮带安全平稳运行。从应用实践来看该防跑偏托辊的滚皮及防偏嘴部件磨损较为严重,防跑偏托辊平均使用寿命仅7个月。对原防跑偏托辊从主体轴、防偏嘴、滚皮三方面进行了针对性结构改造,结果表明:应用改造后的防跑偏托辊有效解决了主运煤带式输送机皮带跑偏现象,防跑偏托辊使用寿命提高至20个月,安全经济效益显著。

高压辊磨技术在铜冶炼渣选矿中的应用研究

介绍了高压辊磨技术的原理及其铜冶炼渣处理现状,为后续实验提供了理论基础;设计了高压辊磨机械结构,并分析了高压辊磨机械工作原理;分析了高压辊磨工艺参数,包括辊磨原理与磨削切入线与磨削宽度;仿真分析验证了工艺参数的有效性。结果表明:高压辊磨处理后的渣粒度分布更加均匀,颗粒尺寸更为细致,同时渣中有价金属的析出率显著提高。

矿山硬岩巷道掘进技术现状与展望

钻爆法和截齿破岩技术被用于解决硬岩截割的难题,但2种方法都存在诸多不足,难以适用于矿山硬岩巷道安全高效掘进。根据破岩方式的不同,对当前前沿的矿山硬岩巷道掘进技术进行了总结和探索研究。首先,阐述了不同硬岩截割方式的破岩机理,结合巷道成形方式介绍了国内外先进的硬岩巷道掘进装备,分析了相关装备的优缺点,指出了其适用范围。最后,分析了目前前沿的硬岩巷道掘进技术的局限性,指出了各种硬岩巷道掘进技术的未来发展趋势,高灵活性及各种破岩方式复合技术是实现矿山硬岩巷道安全高效掘进的发展方向。

内蒙古某低品位铁矿选铁工艺试验

内蒙古某低品位铁矿全铁品位为20.33%、磁性铁品位为13.05%,为开发利用该铁矿石并确定合理的选铁工艺流程,在矿石性质研究的基础上,进行了原矿高压辊磨预选—预选精矿阶段磨矿—单一磁选工艺,高压辊磨预选—预选精矿阶段磨矿—磁选淘洗联合工艺,高压辊磨预选—预选精矿阶段磨矿—磁选浮选联合工艺3种工艺方案的试验研究对比。试验结果表明:3种工艺方案均可获得铁品位65%以上的铁精矿,前2种方案的选矿指标相当,且远优于方案3,而方案2较方案1可明显放粗二段磨矿细度,因此确定采用原矿高压辊磨预选—预选精矿阶段磨矿—磁选淘洗联合工艺作为该矿选铁的最佳工艺,最终获得了铁精矿产率19.07%、全铁品位65.50%、铁回收率61.50%的选别指标。

辊压机电气控制系统的故障诊断与维护技术

辊压是锂电池极片制造过程中的关键工艺,其精度直接影响到锂电池的性能。辊压机作为实现这一工艺的主要设备,其电气控制系统的稳定性和可靠性至关重要。然而,辊压机的高效运行离不开其电气控制系统的支持。作为复杂的机电一体化设备,电气控制系统负责监测和调节辊压机的各种工作参数,确保设备在最佳状态下运作。此外,该系统还可以通过实时数据反馈,及时调整操作策略,以应对不同的生产需求,从而提高整体生产效率,降低能耗。因此,完善和升级电气控制系统对于辊压机的性能提升至关重要。

水利工程大坝施工中碾压混凝土施工技术分析

在我国水利工程中,大坝施工是其中非常重要的一个环节。而在大坝施工过程中,碾压混凝土技术是不可或缺的一项技术。本文对水利工程大坝施工中碾压混凝土施工技术及施工质量控制措施进行分析,希望能够为建筑质量发展提供有价值的一般性经验和方法。

港口散料输送系统外转子式永磁直驱技术应用分析

将外转子式永磁直驱滚筒技术应用于某港口输送系统工程,统计输送系统全年运行数据,分析和总结该技术在空间体积、传动效率、环保节能、安全维护等方面的特性,为其他港口新建或改造输送系统提供借鉴和参考。