Motion of Positive Winding of Ring Spinning Frame

The problems of the bobbin capacity and the high speed unwinding yarn taking off the ring or not during the winding of the ring spinning machine were dealt with. The mathematical model of the ring winding machine motion law was analyzed and optimized.Through the analysis and study of the movement rule of bottom bobbins and the ring spinning frame spool forming, the mathematical model of active bottom bobbins forming movement was established. Also,the mathematical model of bobbins formation was simulated and optimized. The concept of "controlled nail"was put forward. On this basis,the mathematical model of the current tube forming motion was optimized. The experimental results demonstrated that the theory of"controlled nail"met the high-speed spinning winding theory. The theory of "controlled nail "not only did the capacity of the bobbin increase,but also the spinning speed and efficiency are both improved,reducing the high-speed winder winding off. This research could provide a theoretical basis for the development of a new ring spinning frame.

巴基斯坦C-2工程环形起重机轨道及循环水管道焊接施工

论述了C-2工程环形250t起重机轨道的对接堆焊过程和方法。介绍了该项目循环水管道的优化焊接工艺,优化管口、加强肋焊缝的布置,并对焊接工艺及验收标准进行优化,改进焊接坡口和焊接方法。优化后,减小了焊接及相关辅助材料的浪费,省去了管道在车间制作时的碳弧气刨工序,减小了人工的投入,有力地保证了焊接施工质量及工期。