Advanced Materials Research Vols. 605-607

Abstract: The involute cam–baffle is one of the most important precision components in generating motion types of the gear grinder (such as Y7125). In order to meet the requirement of grinding ultra precision master gear, the high-grade involute master measuring apparatus is designed. The apparatus meets the continuous scanning measurement principle and the forming principle of the involute. According to evaluate the uncertainty components, the measurement uncertainty of the involute master measuring apparatus is 0.45 m. Finally a measuring experiment for an involute cam is conduced, the measuring results show that the total profile deviation is not more than 0.6 m and the profile form deviation is not more than 0.4 m. The experimental results show that apparatus has the capability of measuring high-grade involute master and high precision of involute cam.

Abstract: To achieve the design goals of transmission with small size, light weight and low cost, the pushrod harmonic mechanism which is consist of harmonic planetary and cam mechanism is proposed, and the speed-down device of low-speed motor is changed from external installed to interior installed. Based on the mechanism principle analysis, derivation of contour equation and kinematics analysis, the centroid movement theorem of the pushrod roller and the mechanism dynamic is analyzed when the sports vice friction was considered and ignored. The total reaction force and the action line are gained. These data can provide evidence for mechanism simulation, efficiency analysis and reliability design.

Abstract: Aim at the difficulty in determining the dynamic load , dynamic problems were analyzed, including three mechanisms of the shipbuilding gantry crane of lifting、trolley running and cart running under the joint starting and braking by adopting the method for determining the dynamic load based on the vibration theory and the one for determining the dynamic load based on the virtual prototype.Dynamic models and virtual prototype model were established and the time-varying dynamic loads of mechanisms were determined under typical working conditions. The maximum dynamic load obtained provides a reference for the dynamic finite element analysis of the shipbuilding gantry crane.

Abstract: The purpose of this paper is to provide two kinds of method to distribute the transmission ratio of three-stage cylindrical gear reducer. In the process, all the gears have the full contact stress in every stage. Besides, one method can also obtain the minimum volume of gear reducer and another one is to make all big gears have good flood lubrication. According to the two principles, the equations of distribution on transmission ratio and further a practical distribution graphic are examined, which have the applicable significance of actual engineering and can be the base of the distribution on transmission ratio of other kinds of gear reducer.

Abstract: This paper discussed two types of traditional pressurization system on cotton lap of roll machine—mechanical and pneumatic, analysed their working principle, put forward a new design concept, with compact structure, based on the electro-hydraulic proportional control technology and tested with experiments. The results showed its effective function to control pressure stably.

Abstract: The stress analysis of the intersections region of nozzle & blind flange is implemented by means of FEA. The stress variation rule was obtained and the maximum Stress intensity is at the inside of intersections region of nozzle & blind flange. In accordance with JB4732-1995 (2005 Confirmed edition), the safety of structure was evaluated. The results show that the dimensiom given in the paper can meet the requirement for safety.

Abstract: The original scheme flow behavior of WISCO 60t two-strand tundish was investigated by means of hydraulic model. Optimized scheme was selected by flow field Character analyzing and residence time distribution (RTD) curves analyzing of each scheme. The results show that the dead volume Vd of optimized scheme decreases to 5.33%, reduced by 77.4% compared with the original scheme. The average residence time Ta of optimized scheme increases to 364.5s, increased by 70.5s compared with the original scheme. The optimized scheme favors more reasonable flow field and inclusions removing in the tundish. It is more adaptive than the original scheme for the tow-strand tundish.

Abstract: A hydro-viscous winch comprises a disc brake and a hydro-viscous brake. The hydraulic system is of utmost importance to the performance of the winch. To verify the validity of the hydraulic system, by using AMESim software, the simulation model of the hydraulic system was built and the performance analyzed. The results show that 1) the pressure and the flow rate of the disc brake hydraulic system are mainly affected by the energy accumulator; 2) Hydro-viscous brake hydraulic system pressure and lubricating oil flow rate are influenced by orifice diameter of the throttle valve; 3) during the braking period, the amplitude of the deceleration is rather small and the hydro-viscous winch hydraulic system can meet the requirements well. Research achievements of this work provides theoretical basis for optimal design of the hydro-viscous winch hydraulic system.

Abstract: Load system is an important device of hybrid excavator test bed. According to technical requirements of 6 tons hybrid excavator test bed, technique parameters of load system was analyzed and hydraulic load system design scheme based on relief valve was determined. Fundamental diagram of hydraulic load system was designed and working process of load system was introduced. Based on AMESim software, numerical simulation model of hydraulic load system was established. With simulation research, maximum load power and typical load power of load system were simulated. Simulation results show that the hydraulic load system can meet design requirements. Prototype of hydraulic load system was developed and load experiment tests were carried out. Experimental results show that the hydraulic load system can be used to develop hybrid excavator performance test.

Abstract: When we research on pneumatic performance of aero-engine blades,some functions are not solved directly in physical domain because blade coordinates are unknown,but they can be solved after being transformed to computational domain.For potential function and stream function have the orthogonality themselves,mesh of computational domain is orthogonal after orthogonal transformation and the functions are solved easily.The existence conditions are two-dimensional flow continuity equations.If fluid is irrotational and powerful flow,potential function and stream function are both usesd to describe flow field’s velocity,pressure distribution.etc.Therefore,we select potential function and stream function as basic method for researching optimization design of aero-engine blades.