Geomechanical model of the pneumatic borer and soil interaction

Based on the constructed geomechanical model of the pneumatic borer and soil interaction and using the finite element method, the authors solve the problem on the stress state in soil enclosing a moving pneumatic percussion machine, considering variation of physico-mechanical properties of soil. The experimentally measured and calculated relative accelerations of acoustic field depending on the machine orientation in soil are compared.     

Mobile machinery team for strengthening of soil foundations

A review is presented for the up-to-date special-purpose construction techniques for bar-re-enforcement of a soil mass, strengthening of soil foundations and removal of the defects in motor and railway roadbeds by injection. It is shown that a promising tool of solving these tasks is an air percussion machine with an end-to-end axial channel. The air distribution system that ensures decrease of the air unit rate is considered. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 6, pp. 49–57, November–December, 2007.     

Concerted operation of pneumatic percussion tool and air-aided chips removal line in horizontal hole drilling machines

The authors study work process of pneumatic percussion units with valveless air distribution under exhaust back pressure in drilled solid removal line in long horizontal hole drilling machines. It is shown that range of efficient values of the machine performance equal to maximum percussion force does not change under increase in the exhaust back pressure.     

Blow energy transmission from a striking machine element to a pipe via adaptor

The article describes the experiments on energy transmission from a percussion machine to a pipe via a cone adaptor. The calculation model of the said percussion system is presented, and the calculation and experimental results are compared. It is quantitatively ascertained that the percussive system parameters have influence on the blow energy transmission that is a determinant of the driven pipe advancement in soil.     

基于PLC控制的多功能土壤地下水调查采样机的研发

本文阐述了多功能土壤地下水调查采样机的基本工作原理,通过内装式PLC、触摸屏控制电机等设备实现了履带工作平台的移动、复合动力头的工作、辅助设备的液压缸工作,提出了具体的机械运动方案和整套PLC装置控制流程。该采样机具有操作简便、运行稳定流畅、安全可靠的特点,既保证了对地下土壤和水采样过程的安全性,又节省了工作时间,提高了工作效率。     

煤矿通风机声源降噪分析及对策

从煤矿通风机结构和工作原理入手,分析风机噪声产生的机理和特征,认为气动噪声是风机噪声中的主要部分,应作为控制的重点,并阐述从噪声源上控制噪声的方法,即设计制造高性能、低噪声的通风机。对已安装投入使用的通风机,进行合理的结构改造和安装适当的消声器是控制通风机噪声的主要手段。     

Influence of air distribution system on energy efficiency of pneumatic percussion unit of circular impact machine

The article describes computer modeling of three options of pneumatic percussion unit in a circular impact machine. All options have similar structure diagrams and mechanical linkage parameters but different control of energy-carrier feed in a working chamber: valveless; with one or two circular elastic valves. The obtained data allow quantitative evaluation of operation of such systems given the accepted constraints for mechanical block.     

盾构机土仓压力控制模型及其参数辨识

基于改性后渣土的非线性本构关系,建立了盾构机土仓压力控制模型。根据现场观测的土仓压力、螺旋输送机转速和盾构机推进速度数据,提出了基于遗传算法的土仓压力控制模型参数辨识方法。工程实践应用结果表明,所建立的土仓压力控制模型及其参数辨识方法是十分有效的,土仓压力控制模型预测的土仓压力与观测值吻合较好。     

液压缝管式锚杆安装机

针对目前国内井下矿山及地下工程中安装缝管式锚杆的需要，提出了一种结构新颖、有独特的自进给功能而不用任何支撑及进给装置就可安装缝管式锚杆的液压锚杆安装机。论述了其工作原理，并就其冲击机构及锁紧装置的设计要点作了介绍。该安装机以液压能为动力，具有体积小、重量轻、节能等优点。     

变频技术在龙固煤矿空气压缩机上的应用

介绍了龙固煤矿空气压缩机的运行情况,指出了运行中的不足。阐述了应用变频技术的原因、工作原理及应用变频技术后产生的经济效益。     

基于声发射法掘进机故障诊断研究

为了能够提高掘进机故障诊断的准确率,确保掘进机能够正常稳定地工作,深入研究了声发射法在其中的应用。分析了掘进机的主要故障及原因;研究了掘进机声发射信号产生的机理;探讨了掘进机声发射信号监测系统的设计;结合小波神经网络法和声发射法进行了掘进机的故障诊断研究,诊断结果表明该方法具有较高的故障诊断精度。     

Evaluation of Layout of Air Drill Hammer with Smooth Adjustment of Impact Impulse Frequency

Design of an air drill hammer with the smooth adjustment of the percussion frequency at the constant blow energy is considered. The proposed and analyzed modifications of air distribution system are based on using a mechanically closing elastic valve. The test data on experimental prototypes of the air drill hammer with the external distributing elements that set blow frequency are presented. The frequency adjustment ranges are determined.     

煤矿风井噪声控制的声学设计和阻力损失计算研究

随着国民对噪声危害认识程度的提高和国家对噪声污染处罚力度的加大,近年来,辐射强、危害大的煤矿风井噪声治理成为当务之急。但一些环保公司缺乏技术实力,理论计算含糊不清,凭经验或模仿其它风井噪声治理工程,引发一系列问题,如产生共振、噪声控制达不到设计标准、通风阻力过大导致风量偏低;再生噪声超标、电机散热不畅导致寿命缩短或毁坏、     

Engineering and analysis of independent movable compression–vacuum percussion source of P-waves in seismic survey

The experience of engineering a small mobile compression–vacuum machine for seismic prospecting at shallow depths of 100–150 m is described. It is shown that percussion sources are preferable for shallow-depth seismic survey. The article reports laboratory and field testing data. The authors identify ways of further improvement of such machines.     

通用平面恒速扫描感应淬火机床的研究与设计

针对设计感应淬火机床中如何实现感应圈与工件间相对速度恒定的问题进行研究。以盘形凸轮为例分析感应淬火机床的运动,用折线代替曲线,将复杂的凸轮轮廓适当简化,建立运动参数间的数学模型,选用先进的运动控制卡控制感应圈和凸轮间的运动,实现两者间相对速度基本不变。     

TPD2800型土压平衡顶管机在回填土地层中的应用

介绍了TPD2 800型土压平衡式顶管机的工作原理、构造特点和刀盘改进的工艺特点。对改进型顶管机在低覆土厚度下的回填土地层中项进时的土压和顶速控制等进行了探讨，结果该工程158 m试验段DN2 400管道的贯通证明，只要选择合适的设备，再加上有效的监控措施，在覆土层厚度不低于0.5倍管外径的前提下，应用土压平衡顶管法是...     

碎石机支臂结构的应力分析与试验研究

碎石机是一种多用途的冲击破碎机械。本文就碎石器的冲击反力、主臂应力进行了理论分析,并对在碎石器连接座上设有橡胶缓冲装置的碎石机主臂强度进行了测试研究。     

Substantiation of type and parameters of downhole air hammer with a view to increase small diameter hole drilling velocity

The article substantiates the need of designing a rotary–percussion drilling tool to drill holes 40–60 mm in diameter and to 50 m long. The drilling rig with a downhole air hammer has been designed and manufactured. The authors have carried out analytical and experimental research to determine drilling velocity in different rocks of varying hardness.     

Effect of additional vibration exciter and coupled vibro-percussion units on penetration rate of pipe in soil

Aimed to improve capacity of vibro-percussion driving of steel pipes in soil, the authors describe experimental modeling of the process with additional vibration exciters of axial and transverse vibrations series-linked to impulsive load source. Workability of the combination of two extended action spectrum percussion units as the vibration exciter is illustrated.     

武钢金山店铁矿西副井通风机房进风口噪声治理

叙述了对空气动力噪声和机械噪声所采取的降噪措施以及其计算与构造 ,对采取降噪措施前后的声环境进行了实测