| The carbon cathode block is one of main component of the aluminum reduction cell. It is the bottom and the cathode of the cell. The quality of carbon cathode block is one of decisive factors of the life of aluminum reduction cell.Carbon asphalt paste is the medium between carbon block and steel bars. If the paste was uneven, a local high-temperature would arise from bad contacts between the carbon block and steel bars. This kind of local high-temperature will make the catholde carbon block to be destroied at work. The quality of cathode carbon block lies on the spreading quality of paste between carbon block and steel bars. The spreading quality of paste depends on the performance of screw conveyor and the physical properties of paste. Therefore, it is very important that the study to the physical properties of cathode asphalt paste and the transportation issues of paste in the screw conveyor.At present, the research and development for the transportation of screw conveyors generally base on the dry powder or granular material. The few studies for the spiral transportation of cathode asphalt viscous particles restricted the development and application of screw conveyor in this field. The study objective in this article is to provide a theoretical basis for the transportation of screw conveyor of paste in the Production Line for Cathode Block Assembled Automatically. By analyzing the parameters of structure and work of screw conveyor, established Dynamic Double Barycenter Method which for the analysis of relation between the deformation of spiral axis and filling rate of screw conveyor, optimized some structures of screw conveyor so that it can carry and measure paste better. The research methods for the screw conveyer and carbon asphalt paste in this article also are fit for the research to the similar machines and viscous particles. The main work of this paper as follow:(1) The physical and mechanical properties of carbon asphalt paste are premise base of the transportation of viscous paste. And the physical and mechanical characteristic of carbon paste is relevant to the characteristic of binder directly. The appropriate transportation temperature can be confirmed by the temperature-dropping experimentation, and then the characteristic of binder can be confirmed.(2) Researched the forces between the paste particles, analyzed the main forces and their influence to the macroscopic form of paste particles from the view of microcosmic.(3) Studied the accumulation of paste particles in the screw conveyor and the mutual influence with the structure of the conveyor by new analysis method.(4) The paper established the finite element model of cantilever screw conveyor, analyzed the influence of structure and operation parameters of spiral object on the job performance of screw conveyor by Finite Element Analysis (FEA), optimized the design of the screw according to these analytical data, amended the power calculating formula by the friction experimentation of cathode asphalt paste and real power data of screw conveyor. |
