Advanced Materials Research Vols. 889-890

Abstract: Double bag packaging line which is widely used in packing line is a packing type. There are traditional double bag packaging line and automatic packaging line. Among them, the automated packaging line processes include: On the bag, filling, bayonet, seaming, transporting, stacking and other processes. However, bayonet is an essential process in packaging line. The design of automatic buckle machine plays a key role in reducing labor intensity, improving production efficiency of filling line and ensuring product quality. This paper conducts a discussion and analysis in depth on automatic bayonet machine design.

Abstract: A CFD simulation of the performance of an EGR cooler was carried out. Considering the differences between the heat exchange process of its inlet portion, middle portion and outlet portion, this simulation divided the model into three parts and analyzed them in turn. For the inlet and outlet portion, the convective heat transfer model was applied; while for the middle portion, an air-solid-liquid three-phase heat transfer model, based on strong coupling was extracted. According to the geometry continuity of the model, the boundary conditions of the middle portion was determined by the simulation result of the inlet portion, and the boundary conditions of the outlet portion was determined by the simulation result of the middle portion. Ultimately, we can gain the overall temperature distribution of the EGR cooler under the premise of ensuring the accuracy of the heat transfer model and minimizing the computation. This model based on decomposition methods was applied to the temperature field simulation under different EGR cooler rate and the simulation results were in good agreement with the experimental results.

Abstract: The dynamic and thermal characteristics of spindle assembly will affect the final machining performance of a machine tool seriously. It is of great significance to study the dynamic and thermal characteristics of the spindle assembly for improving the level of machine tool's design and manufacturing. The paper takes a high precision computer numerical control lathe as the research object. First the thermal characteristics were obtained by using finite element method. Then the laser triangle measuring instrument and the infrared thermal imager were used to measure the temperature field and thermal deformation of the spindle assembly. Finally in order to get the thermal equilibrium time and the thermal deformation data of spindle system, the wavelet toolbox was used to deal with thermal testing data. The paper's work laid a foundation for the further research on the thermal characteristics analysis and thermal error's compensation of machine tools.

Abstract: Non-azeotropic auto-cascade refrigeration system utilizes various components of different boiling refrigerant to get low-temperature. With R22, R23 and R14 as a non-azeotropic refrigerant auto-cascade refrigeration cycle system. Through the experimental study of non-azeotropic refrigerant charging and the ratio between the amount of charge, to analyze the effect of these three refrigerants charging and relationship of the fraction on the whole refrigeration cycle refrigeration temperature. To improve overall non-azeotropic auto-cascade refrigeration systems working efficiency. So as to achieve the purpose of energy saving.

Abstract: Processing of following holes may decrease manufacture precision of processed spindle holes. To decrease the unfavorable influence on spindle holes and improve the manufacture reliability of spindle boxes, the paper applies a partial correlation relationship and hypothesis testing to find the holes which have correlation with the spindle hole. The partial least squares establishes the mathematical model of manufacture error correlativity so that the paper finds the magnitude of influence these holes has on the spindle hole through coefficients of the modeling. The model provides the foundation for improving manufacturing accuracy of holes that have great influence on spindle holes to decrease manufacturing error of the spindle hole and improve the reliability of spindle boxes. The example proves the methods applied to decrease the unfavorable influence on the spindle hole are specific and operable.

Abstract: With the development of economy and society, there are more and more modern industrial workshop, electricity is the main energy of a modern industrial workshop. Ensure the safety of the power of the industrial building is a key consideration in the design of industrial distribution, and an important content of the healthy development of the industry. There are many problems in the current electrical system, these problems are associated with grounding system with large and small, so in the electrical system, grounding system installation process to ensure that the electrical use one of the main means of security. Modern workshop electrical grounding system is analyzed and the construction of all kinds of earthing measures should be taken.

Abstract: This paper based on the Homogeneous equilibrium multiphase flow theory.By using FLUENT software the high-speed underwater projectile resistance characteristics were studied.Analyzed the influence of cavitator diameter and Cavitation number on drag reduction characteristics of the projectile,and compared with the empirical formula.The results showed that the larger the diameter of cavitation,the easier supercavitation natural formation,but the drag coefficient be greater.

Abstract: In this paper, a new polymer process machine--- centrifugal extruder is introduced. The pressure and temperature distribution of centrifugal extruder has been studied by theoretical analysis, which is based on mathematics and experiments. The results show that the pressure and temperature Distribution can provide the processing of solid-plug conveying sufficiently and stably, which can prove the industry practicability of centrifugal extruder. Keywords: Solid-plug Conveying, Centrifugal Extruder, Polymer process, Mathematics analysis.

Abstract: The fluid domain model of a new oil-air distributor in oil-air lubrication system is built and the phase distribution of oil and air two-phase flow on distribution interface is simulated based on the CFD model in Fluent, the mass flow rate of oil and air are collected from three different cross sections when the structures of oil-air guidance slot are designed as a plane, sphere and cone shape respectively, then the influence of oil-air guidance slot structure on the performance of distributor is analyzed in the oil-air lubrication system in this paper. The results show that the spherical surface and conical surface of oil-air guidance slot can improve the uniformity and stability of the oil and air two-phase flow distribution, promote the flow pattern to form a continuous annular oil film. Among these three structures of oil-air guidance slot, we also find that the distribution performance of conical surface is the best.

Abstract: The characteristics of the sudden-expansion pipe in oil-air lubrication system have been analyzed based on Fluent. The results show that the pressure and oil film mutate when the annular flow through the sudden-expansion pipe and the suddenly change of position of pressure and film is not affected by the inlet air velocity, however, the strength of pressure and film is in direct ratio with the inlet air velocity. The film of oil-air annular flow in the pipeline before the suddenly expanding part is well-distributed, but the distribution after that is widely affected by the air velocity and the pipe diameter, and furthermore the larger air velocity and pipe diameter increase the degree of dispersion of the annular flow film.