Based on the theory,this text analyzes several influencing factors of the efficiency for the whole elevating equipment,and indicates the importance that the promotion of the elevating efficiency do to the efficiency for the whole elevating equipment,besides,it analyzes the influence that the movement parameters do to the elevating velocity efficiency and the optimizing range of the maximum velocity in detail,which porvide for the primary design of the mineral well with certain referring basis.
This paper presents a skew rolling between two rolls tube elongator with stretched mandrel, which has the following advantages: higher operating efficiency;
This paper presents a 2-skew-roll piercing mill with single rotating disc, which has following advantages: simplification in mill construction; flexibility of adjustment; high efficiency of piercing speed;
This paper presents a skew rolling between two rolls tube elongator with stretched mandrel, which has the following advantages: higher operating efficiency; stabilization of rolling process; reduction of energy consumption; higher quality of tube products and posibility of rolling under large feed angle etc.
This paper presents a 2-skew-roll piercing mill with single rotating disc, which has following advantages: simplification in mill construction; flexibility of adjustment; high efficiency of piercing speed; stability of rolling process; reduction of tendency to cavity formation; feasibility of rolling under larger feed angles etc.
In this paper, the process of carrying out a DEM international experiment, organized by the ISPRS Commission Ⅲ in 1980 is described. The instrument used is a home-made Computer Controlled Digitel Mapping System including an Image Coordinate Digitizer. It has been found that so far as precision and speed is concerned, our bme-made instrument is superior as compared with other imported instrumnets. The cost is also much lower.