Abstract: The paper introduces the main technical characteristics of the high-frequency vibration screen and analyzes the study situation of high-frequency vibration screen technology at home and abroad It briefly introduces the main characteristics of commonly used high-frequency vibration screens at present, and proposes the future development tendency of the high-frequency vibration screen according to current issues about the development of the high-frequency vibration screen The proposed development tendency includes the application of advanced analysis software and testing tools for optimization and analysis, study on manufacturing process of the high-frequency vibration screen as well as study on structure of rubber springs, sieving plates and vibration exciters, study on relationship between technical parameters and process parameters, developing towards large scale and fineness, decreasing operation noise of the high-frequency vibration screen

Abstract: Through analysis on the structure and the opearation mechanism of the hydraulic rock drill,the dynamic model of its impact mechanism is built with AMESim,and the displacement variation curves of the piston and the reversing spool as well as the pressure variation curves of the piston chambers are obtained.The simulation results show that the simulation model has the same operation status with the actual operation,which offers new references and method for the design and the study of the hydraulic rock drill.

Abstract: The paper introduces the current situation of tracked and trackless auxiliary transportation in domestic and foreign mines, equipment characteristics and application situation, as well as expounds the development tendency of the mine auxiliary transportation equipment and the development direction of the auxiliary transportation system. In addition, it points out pressing issues need to solve in underground auxiliary transportation.

Abstract: With numerical simulation tool of Fluent,water jet from different nozzles with contraction angle of 5°,10°,20°,30°,40°,50° are simulated under pressure 20 MPa and 30 MPa,and the simulation results are compared and analyzedThe results show that the maximum velocity in the axial direction gets slow as the contraction angle gets wider;the jet stability of the nozzle with contraction angle of 10° is the best;the jet from the same nozzle possesses similar character under different pressuresThe study offers references for the selection of the nozzle shape and pressure pumps

Abstract: In the paper,lubrication oil in diesel engines serving as the example,the process of diesel oil contamination is analyzed,and the mathematical model reflecting contamination of lubrication oil in diesel engines is established.Then the factors affecting the contamination of lubrication oil are studied.The conclusions is proposed that the contamination of lubrication oil in tanks begins from the initial contamination and then varis exponentially and eventually tends to steady state.Other conclusions is put forward that the contamination of lubrication oil increases with the rise of external contamination particle's penetration rate Ri and the rate Rp of wear debris generated in the system,and decreases with the increase in filtration ratio βu1,βu2,βu3 ,as well as has nothing to do with the initial contamination degree C0 of lubrication oil,etc.

Abstract: In order to study the strength characteristics of cutting picks with various shapes,according to the feature that actual external load is random during the cutting process of the cutting pick,solid models of three kinds of flexible cutting picks with various structures and shapes are built by using LS-DYNA,and the rock model is built also based on IEF constitutive model according to the display dynamics theory.Through simulating the cutting process of the three kinds of cutting picks,variation curve of the stress on tips of cutting picks and its statistical values are obtained,as well as the stress of cutting picks acting on different rocks and its variation tendency are obtained.The results offer references for studying the influences of shape of the cutting pick on its strength and improving the service life of the cutting pick,and provide a new method for the selection,design and usage of the cutting pick.

Abstract: Most failures of the hydraulic support are caused by liquid leakage from the column of the hydraulic support.After the corrosion mechanism of the column of the hydraulic support being narrated,several typical surface treatment techniques for anti-corrosion of the column of the hydraulic support are introduced,and the development trend of anti-corrosion of the column of the hydraulic support is indicated.

Abstract: The working principle of the atomic force microscope(AFM) is introduced,and the current application status of AFM in mineral processing field is summarized.Based on the principle and characteristics of AFM,it is considered as the powerful tool in mineral processing field to offer new path for studying the surface structure,understanding the interaction between minerals and solution and the interaction among minerals as well as discussing the interaction mechanism.

Abstract: Aim at the shortcomings in analyzing the motor dynamic process by traditional circuit and electro-magnetic field analytical method,an induction motor serves as an example to establish the field-circuit coupling time-stepping finite element model and analyze the no-load starting process of the motor based on sport electro-magnetic fields.The results show that more reasonable conclusions are achieves by the model than by traditions models.The study possesses some value for improving the level of design and operation of the motor.

Abstract: Based on the working characteristics of the gearbox of the heavy vehicle, the power spectrum analysis and the cepstrum analysis of the gearbox vibration signals are carried out. In addition, the structural modal analysis of the gearbox is conducted also. The analysis results offer foundation for the dynamics optimization design of the gearbox structure, which aims at reducing vibration and noise.

Abstract: The water flow field in hydrocyclones is numerically simulated by Reynolds stress model. Based on the simulation results, the sediment particle is simulated by the particle random trajectory model with taking the diffusion caused by turbulent pulsation into consider in the model. In addition, influences of structural parameters of hydrocyclone overflow pipe, underflow pipe, cylinder and cone angle on separation efficiency and pressure drop are discussed. Calculation results show that hydrocyclones with different structural parameters greatly differ in separation efficiency and pressure drop. In practical application, hydrocyclone with suitable parameters should be selected according to different requirements.

Abstract: The paper describes the high pressure grinding roll(HPGR) about its structural characteristics,development situation and application in metal mines.It emphatically introduces the technical process of powder pre-separation systems composed of HPGR used for comminuting low-grade iron and magnetic pre-selection device,and analysed the parameters and working conditions need to consider as selecting HPGR for fine grinding operations in metal mines(especially in iron mines).

Abstract: The principle and the features of the laser cladding technology are introduced,and the technology is used for surface strengthening of the hydraulic prop.An alloy strengthening layer is clad onto the surface of the hydraulic prop by the technology,so that the surface hardness,corrosion resistance ability,wear resistance ability and service life of the hydraulic prop obviously improve.

Abstract: The influence of the axial gap between blades and rear guide blades on performance of mine-used small axial flow fans is analyzed using CFD technology after numerically calculating the axial flow fan.The results show that the flow rate and the total pressure of the fan increase with the decrease in the axial gap,thus the efficiency of the total pressure improves and the performance of the axial flow fan enhances.

Abstract: The paper introduces several traditional support vector machines(SVM),and proposes a multi-class classification algorithm based on ordering binary tree SVM.In the algorithm,the sample distribution radius and sample distribution distance are used to estimate the distribution situation of various samples among the high-dimension characteristic space,so as to determine their classification zones in the characteristic space more precisely.After the simulation analysis of fault diagnosis on the hoist braking system by the algorithm,it is showed that the algorithm is characterized by high diagnosis velocity and high fault identification ratio.

Abstract: The results of flotation experiment for a certain aphanitic graphite from Hunan province are introduced.The flotation experiment of the aphanitic graphite with carbon content of 73.27%is carried out,which includes flotation by flotator and flotation by flotation column.The results of the two flotation experiments are contrasted,and their flotation efficiencies are evaluated.

Abstract: Energy harvesting to supply the power sources of sensors in wireless networks is a focus over recent yearsServing as an effective and feasible method,the harvesting of ambient vibration energy has become one of the research and development directions,but this method has not yet formed a complete set of theory and design methodsIn the pa-per,a piezoelectric cantilever device for harvesting the ambient low-frequency vibration energy is designed,and influ-ences of its structure on output voltage and power generation capacity are studied alsoOn condition that the accelera-tion being 2m/s2 and the vibration frequency being 64Hz,ANSYS simulation is used to conduct simulationThe study results show that the piezoelectric cantilever can produce 86μW power energy which meets the operation requirements of sensors in wireless networksIt provides a method and corresponding theoretical basis for the harvesting of ambient low-frequency vibration energy and the design of self-supply devices for sensors in wireless networks

Abstract: To determine the force,stress distribution and breaking causes of roadheader picks,loadings on a single pick are simulated with MATLAB,and the explicit dynamic analysis of the pick during whole cutting operation is carried out with ANSYS/LS-DYNAThe results show that the force on the pick varies with the thickness of the cutting scrap,and both the maximum deformation and the maximum stress appear at the head of the pickThe study results offer theoretical references for the further structural improvement of the pick

Abstract: After analyzing the application status of the belt conveyor and the idler, the necessity of developing high-speed idlers is proposed. Based on the study of such components as idler shaft, bearing, sealings and bearing pedestal, such key issues of high-speed idlers as radial run-out, rotary resistance and employment lifespan are discussed, which offers theoretical basis for the design and application of the high-speed idler and the high-speed belt conveyor.

Abstract: To realize green mining,a new type of hydraulic support is designed with the addition of cartridge valves based on a shield support.The outlet of the control valve in the support is connected with the supply pipeline of the emulsion pump station,and the outlet of the large-flow relief valve is connected with the emulsion box,which realize the full recovery of emulsion and the recycle of high-pressure emulsion discharged during constant-resistance stage and energy contained in it.The addition of large-flow cartridge relief valves improves the safety of hydraulic supports while roof is pressed periodically.The hydraulic system of the support is simple,reliable and low consumption.Its designing ideas can applied to other types of hydraulic supports and can achieve obvious energy-saving and social benefits.

Abstract: During the cutting operation of the roadheader,the force status of the roadheader is very complicated due to the action of external random dynamic load.After the dynamic model of the longitudinal roadheader simulating upward and downward cutting operation being established,vibration variation of the roadheader's track in different operation modes are obtained,and the force simulation curves of the roadheader' s track in different operation modes are obtained also.The study offers theoretical basis for studying the dynamic characteristics of the operating roadheader.

Abstract: The dynamics equation is established for the one-dimensional viscoelastic model of a belt conveyor, and the traveling wave method is used to establish the overall traveling wave superposition model of the belt conveyor with single drive at head or two drives at head and tail. By the discrete element method, various controlled start-up process is solved and analyzed. In addition, the computer algorithm programs are written and numerical solutions of tension and velocity variation with time at any point on the belt are obtained. The obtained results and variation rules of belt tension and velocity are coincident with the factual situation as well as the numerical data are in good agreement with the theoretical calculation. By comparison of various "S-shaped curves", the reasonable prolonging duration and the reasonable start-up curve are obtained, which is helpful to effectively decrease the start-up tension of the conveyor belt.

Abstract: To integrate automatic programming software with CNC machine tools effectively,CAD/CAM module of CATIA software is used to accomplish the parameterization modeling and simulative machining of parts as well as the output of cutter location source files.In addition,in view of the programming features of DMC60TR machining center installed with MILLPLUS operating system,CNC codes suitable for the machine tool are acquired by applying IMSpost universal post-processor.The codes prove correct through virtual CNC simulative machining.The integration shortens programming time and increases programming quality.

Abstract: In view of energy-saving aimed reconstruction of the hydraulic system of ZL50 loader, a mechanical model is established, and relevant combined simulation is carried out. The mechanical model of ZL50 loader is built in ADAMS and constrain pairs are added onto the model, meanwhile, the reconstructed hydraulic system of ZL50 loader is formed in AMEsim. Finally, the combined simulation of the hydraulic and mechanical system is realized, thus the actual operation status of ZL50 loader is accurately simulated.

Abstract: Welding is a main way of producing steel structural parts, and X-ray examination is one of the major techniques for detection of welding defects. In view of characters of the welding defect image such as dim target boundary, uneven gray scale and strong noise, a method of segmenting the welding defect image by fuzzy support vector machine based on principal component analysis is put forward. Firstly, the principal component analysis method is used to lessen the dimension of the characteristic vector of the fuzzy support vector machine, and eliminate the influence of subordinate characteristic vector on support components, so as to enhance the classification velocity and precision of the support vector machine. Secondly, according to characters of the welding defect image, a kind of segmentation algorithm based on window of 3×3 serving as the unit is proposed. Finally, the fuzzy support vector machine is introduced into the system, so as to weaken the ill effect of noise on constitution of optimal classifier. Experimental results show that employment of the fuzzy support vector machine obtains excellent results in segmenting the welding defect image based on principal component analysis.

Abstract: The determination of the mass centre has been always the problem to be urgently solved during the design of vibration sieves.The deviation of the mass centre easily causes a lot of problems in the course of operation of vibration sieves.Based on a three-dimensional software,the paper carries out the theoretical analysis on the method of determining the mass centre of the vibration sieve with gradually approximation method,and takes a ZK3642 linear vibration sieve as an example to verify.The calculation results show that the application of the method not only improves the design precision,but also greatly shortens the design cycle.

Abstract: Aiming at the breaking of diesel oil filter bracket's bolts on LDW1003 diesel engine due to vibration,the finite element model is established by using the modal test analysis technology and finite element modal analysisVibration test for the diesel oil filter bracket is carried out on the spot,and the signal is processed with DASP software to determine the principal vibration direction and the frequency featuresWith the aid of ANSYS software,the finite element model similar to the actual component is built,and the modality of principal vibration is determined in combination with the results of vibration testAfter the modality is expanded further and the stress analysis for the principal vibration is carried out,the reasons are found out and improved proposals are put forwardFinally,the finite element analysis of the improved bracket is carried out, and its reasonableness is verified

Abstract: The influence of the lining board on the motion of grinding balls in shells of horizontal planetary ball mills are simulated with distinct element method,and the height and the quantity of the lining board included.The study results show that the mean contact force are obviously related with the kinestate of grinding balls;when the thickness of the lining board is 3 mm and the quantity of the lining boards is 6,the grinding balls has the best kinestate and the mean contact force of grinding balls reaches the maximum.

Abstract: Aiming at the dehydration process of fine coal with the slime centrifuge,influences of feedings size,feedings concentration,centrifugal factor and residence duration on the dehydration effect are studied.The results show that variation of the feedings characters have great influences on the dehydration performance of the slime centrifuge,so when they change,the centrifuge's working parameters need to adjust so as to ensure the dehydration performance.The centrifugal factor and the residence duration of the efficient slime centrifuge can be adjusted precisely as the feedings characters change,thus it has good adaptability for feedings with different characters,and is has more advantages than the traditional slime centrifuge.