Advanced Materials Research Vol. 619

Abstract: Transmission principle of a planetary gear reducer of less tooth difference with biasing crankshaft was analyzed. Through force analysis of crank tumbler bearing and crank block bearing, the mathematic model was deduced, and influence factor of forces was ascertained. The even absolute value of supporting force of crankshaft tumbler bearing and block bearing is taken as their equivalent load, the life and efficiency model of tumbler bearing was deduced, and their enhancement measure was put forwarded and tested and verified by example.

Abstract: Designed an intelligent fire-fighting robot system which can meet the requirements of teaching and experiments. Completed the design of robot body structure, the sensor system, the movement execution system, communication function of the system, the modular realization and the overall design. The hardware and software system was mainly focused in the processing of design, and the structural drawings of the mobile robot, the principle analysis of intelligent mobile robot, hardware design and the relevant procedures preparation were completed.

Abstract: Designed a handling robot system which can meet the requirements of teaching and experiments. Completed the design of body structure, the hardware and software system of robot. On the one hand the DC motor is used to power to the robot base by the remote through the wireless module, on the other hand the steering is manipulated through the microcontroller I / O port, and it make the robot to be free to operate and precise positioning of the manipulator.

Abstract: Based on Fischertechnik combination model platform, A type of welding robot is designed and developed. Firstly analyzed the overall structure of the robot to determine the driver program and drive programs, and then assembled and establishment the robot structure in accordance with the modular design finally studied the robot control system. This paper focuses on the hardware design of the robot and control system. Practice has proved that the teaching robot we designed has good promotion and application prospects in the field of teaching.

Abstract: Slit-charge for directional fracture controlled blasting technology has demonstrated the clear superiority in stone drifting in coal mines. However, the slit-charge has not yet been molded products, which limited its application to further promotion. Structural parameter optimization for slit-charge using orthogonal experimental design method was carried out. The slit-charge blasting in Lead column performed, the slit-charge blasting primary and secondary influencing factors were obtained by using range analysis; Range analysis methods were applied to analyze the sensitivity of these factors and coupling influences. Structural parameters of slit-charge were determined according to effect curves. This product is easy to use and significant effect in the field. All of half blast-hole trace ratios are more than 90%, the driving speed could be highly increased．Contour shape of roadway is in good condition to avoid rockfalls and rockslides. Overbreak can be costly. Theoretical results are translated into technology, and technological achievements into products.

Abstract: At the present situation of unbalanced proportion on aiming at the coal roadway mining, and bolting support at a slower speed. Puts forward EBZ-160 type roadheader airborne anchor design idea and principle of the rig. Establishing virtual prototype take advantage of the parametric design software of Pro/ENGINEER, and used Mechanism/Pro interface software put the 3D model import to ADAMS, to anchor rig for dynamics simulation. The simulation results said the machine structural design is reasonable, can satisfy the requirements of operation.

Abstract: In order to improve the dynamic coordinated control performance of shield thrust hydraulic cylinder during the shield construction process, we used the shield electro-hydraulic control synthetic experimental platform as research object. The simulation models of thrust system and external loading were built in AMESim. The result of PID closed-loop simulation indicated that thrust system can enable the compound control of thrust pressure and velocity by using the compound control technique of pressure and flow. In view of the complex and varied external load condition of shield thrust system, we simulated the fuzzy and fuzzy-PID control strategy of thrust system in passive automatic adjustment mode, based on the Joint Modeling and Simulation Environment (JMASE) of AMESim and Matlab/Simulink. The multi-external loads of thrust system mainly contained unequal-fixed load, equal-variable load and unequal-variable load. Finally, a coordinated control theory of shield thrust system was put forward. Such theory could provide some theoretical guidance for the design of shield machine and control of shield construction.

Abstract: In order to meet working requirements, the control system of hydrodynamic retarder of heavy truck should have the capability of rapid response and large flow. Based on the demands as above, a control system of hydrodynamic retarder was designed and simulated to obtain the dynamic characteristics of the control valve of oil-charge and oil-discharge. Finally, the time of oil-charge and oil-discharge of hydrodynamic retarder was computed and the results showed that the control system could meet the working requirements.

Abstract: Valveless servo system is a new technology which is widely used in recent years. Compared to the traditional hydraulic system, valveless servo system has a lot of advantages such as high efficiency, less pollution and saving energy, which will be the main research direction of the hydraulic control in the future. Roll bending machine is a large industrial machine, but the efficiency of existing hydraulic system of roll bending machine is low and the cost of maintenance management is high. Applying valveless system on roll bending machine can overcome these defects. This paper made a study of the control strategies which were about valveless servo system on roll bending machine. And software MATLAB was used to do simulation experiment on valveless servo system. This paper summarized the steady-state error and dynamic characteristics according to output signals in different input signals.

Abstract: A research method of mathematical model of the semi-active suspension is presented. First, the equivalent flow and suspension sketch map are given, after that the damping and elastic characteristics are deduced by using equations of throttle orifice and state of real gas. The semi-active suspension could regulate damping force through changing control valve electric current,and it is verified that the rate of change of damping force could achieve 53%. The rules of structure parameters of valve influence on the export force of semi-active suspension are studied. The analytical equations and conclusions can offer reference to design the intelligent suspension.