Variation in Energy and Production Data of Pneumatic Percussive Machines in the Uplands

Under study is a production system composed of a power motor, compressor, pneumatic percussive machine and a treated medium. Based on the generalized theoretical and experimental data, the author relates productiveness of pneumatic percussive machines, energy intensity of rock breakage in the uplands with the rare atmosphere and elevation of the machine work site above sea level. The obtained results offer a reason-why approach to selection of the pneumatic percussive machine parameters for operation in the uplands.     

Mathematical Models of Hydraulic Percussion Systems

Mathematical model-building and analysis techniques are presented for the hydraulic percussion systems. Some models are proposed for the use in calculating specific designs of percussive facilities. The similarity criteria are determined to compare systems with different sets of elements. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 5, pp. 91–105, September–October, 2005.     

Numerical study into dynamics of self-oscillatory hydropercussion systems. Part I: Double-acting systems

The mathematical model of a 3-D self-oscillatory double-acting hydropercussion system is presented. The dynamic simulation criteria are determined, and the output characteristics of the system are studied numerically in the space of these criteria. The research has revealed a number of the behavioral features of the system in the space of the main simulation criteria, as well as the influence exerted by the mechanical friction, impact velocity recovery factor and other parameters on the output characteristics of the system. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 6, pp. 66–81, November–December, 2007.     

Evaluation of the basic parameters of a tunnelling machine with an annular working organ equipped with a pneumatic impact drive

The calculation model for the basic parameters of a tunnelling machine with a working organ of a bypassing type is developed based on the experimental data obtained. The specifications of machines for making holes with a diameter of 325–426 mm by a combined method are substantiated. The test data for a tunnelling machine prototype are reported. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 5, pp. 41–51, September–October, 2007.     

HMD-7500型多功能全液压锚固钻机的研制

HMD-7500型多功能全液压锚杆钻机由冲击回转动力头、夹持器机构、多维连杆变角机构、大臂给进机构、液压系统等几个部分组成,所有动作全部采用液压驱动方式实现。介绍了钻机的结构形式、机构设计、技术参数、特点,以及工业性试验的情况。     

Wave processes near the face of a borehole during percussive drilling

Conclusions During drilling by high-power hydraulic percussive drills the decompression wave arising in the wash liquid should have a marked influence on the drilling process and should lead to an increase in the drilling speed and bit life. Institute of Hydrodynamics, Siberian Branch, Academy of Sciences of the USSR. Novosibirsk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 6, pp. 36–41, November–December, 1976.     

Technology of dimension stone cutting

The author proposes a promising technology to separate monolith stones and preformed blocks for construction from rocks mass using a diamond rope cutting machine ensuring reduction in labor content, cost and loss as well as enhancing the process production output. The analytical model is developed, and the dependences between the material loss and the technology parameters are found. The main standards are formulated for the technology, and the ways of improving the diamond rope cutting machines design based on material loss minimization are specified.     

Statistical distributions of clusters of elementary damages in loaded materials: Probabilistic cellular automation modeling

Statistical distribution functions of clusters of elementary damages are obtained by probabilistic cellular automation modeling of the process of damage accumulation, and their self-similarity when in the intermediate evolutionary stage is revealed. Studying the time dependences of numerical characteristics of the distributions shows that clustering architecture of damages evolves in the same way as the catastrophe-prone non-equilibrium structures. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 46–52, March–April, 2006.     

Deformation Criterion of Stability for Dumps Located on a Glacier (by an Example of the Kumtor Deposit)

The deformation criterion of stability is proposed to calculate the “glacier — overburden rock” system stability based on the use of the ultimate vertical deformation of glacier. The dependences of the simultaneous change in vertical displacement and total stain rate on seasonal temperature variations are established. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 49–52, March–April, 2005.     

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.     

Deformation of a rock mass during excavation of a flat sheet-like hard mineral deposit

The analytical dependences to describe the shape of a subsidence trough of the earth’s surface under the action of underground mining of a flat sheet-like deposit are constructed by the numerical modeling data. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 3–24, July–August, 2007.     

Determination of properties of structured rock mass by the acoustic method

An approach to determination of properties of a rock mass with a layered structure by acoustic sounding is proposed on the basis of solution of inverse problems of seismic probing. Methods for selecting the initial approximation ensuring convergence of iterative processes are indicated. The optimal parameters of the input signals and the duration of the output signal are found. It is shown that interlayer joints may serve as an indicator of the variation of external stress field in the mass. Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 36–44, May–June, 1999     

轻便快速振动冲击取样机具的研制

为了解决化探取样和环境取样在交通不便、缺水地区的生产实际问题,研制了高效、轻便的振动冲击取样机具。介绍了激振器、取样器及机架等模块的技术参数、结构形式和特点,并结合生产试验情况提出改进建议。     

Percussive rock breaking

Conclusions Rock can be successfully drilled with a tubular rock-breaking tool in a high-energy percussive rig, fitted over the outer surface of the striker mass, surrounding it, and pushed ahead of the striker mass by an amount of the order of the wall thickness of the tool. A tool and striker mass assembled in this way can also be used, without any modification, to break rock. If necessary, blows can be inflicted on the face at small angles by separate parts of the end surface of the tool. Institute of Hydrodynamics, Siberian Branch, Academy of Sciences of the USSR, Novosibirsk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 44–47, March–April, 1980.     

Numerical study into dynamics of self-oscillatory hydropercussion systems. Part III: Back-action systems

The paper describes a mathematical model of a 3D back-action hydropercussion system of self-excited oscillation type. The author determines the space of dynamic similarity criteria and numerically investigates the output characteristics of the mentioned system. By the analytical results shown as nomograms of isolines plotted for the integral characteristics and based on the theoretical oscillograms and phase curves of the dynamic characteristics, the behavioral features of the system in the space of the main similarity criteria have been revealed. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 67–80. May–June, 2009.     

Active rotor for a surface miner

The potentialities are considered for the surface miner application to mine rocks strong up to 100 MPa strength through equipping the machine effector with impact devices. The capacities of the active rotor machine and KSM-2000R are compared. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 95–102, March–April, 2008.     

Energy content of the nonexplosive excavation of rock by excavators with a dynamic scoop

Conclusions  

新型电动凿岩机冲击机构的动力分析

运用动力学理论, 对YDT-31 型电动凿岩机冲击机构的结构及其工作原理进行动力学分析, 建立了机构的一般动力学方程。在此基础上引入电算模拟方法, 对凿岩机冲击机构的动力过程进行了数值计算, 讨论了机构特性对性能参数的影响, 并将理论结果与高速摄影结果进行了对比分析。     

Mechanical triaxial compression machines

The author describes the design of the mechanical triaxial compression machine, its capabilities, test procedure and data processing results, and some of metrology issues. The machine approval on fracture sand-and-clay rocks is exemplified. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 111–119, July–August, 2008.     

Investigation into Characteristics of Working Cycles of Hydraulic Percussive Machines with Ideal Distributor

For two types of cycles, i.e., a continuous one and a cycle with delay at the beginning of back stroke, the results are presented for investigations of variation in characteristics of hydraulic percussive machines. The domains, where the working cycle parameters do not exceed the permissible limits, are plotted in the dimensionless coordinates. The typical theoretical oscillograms are given for the system pressure, as well as striker motion and velocity.