Research Of Automatic Quantitative Double Casting System For Nickel Anode

Nickel is one of the strategic metal minerals with good plasticity,corrosion resistance and ferromagnetism.It is widely used in the military industry,machinery manufacturing industry,petroleum industry,chemical industry,electrical equipment,construction industry,etc.Nickel anode is the intermediate product of electrolytic refining nickel.Its quality directly affects the energy consumption and production efficiency of electrolysis,and then effect the overall cost of electrolytic refining nickel.Therefore,the research of casting process and casting equipment is extremely important in nickel smelting..Before the development of the system,the same points and differences of the nickel and copper anode casting process were firstly described.The realizability of the automatic quantitative casting of the nickel anode was analyzed.An improved automatic quantitative casting process for of nickel anode was proposed and designed by referring to the upgrading idea of automatic quantitative casting for copper anode and the current quantitative casting process.According to the designed process,the control system scheme of automatic quantitative casting of nickel anode was designed by selecting the appropriate control system and executing the system drive components.It is required that the intermediate ladle is stable in rotation,steady in supplementary flow rate and accurate in supplementary weight when it is filled.The driving structure and weighing structure of the intermediate ladle and the two-stage control method of the intermediate ladle are designed to achieve the goal of stable flow rate control and accurate supplementary weight control.The acceleration generated by the tilting caster and the change in the weight of the oil in the hydraulic cylinder will cause interference in the weight collection.This problem is solved by a sliding casting machine with a servo motor as a driving element.The casting flow rate curve and the motion control curve hyperbolic model are designed to control the motion of the servo motor,and the motor speed is adjusted by the flow rate feedback.Through the above measures,the weight and quality of the cast nickel anode are ensured to meet the requirements.The entire quantitative casting process is controlled by PLC,and the PLCcalculates the liquid flow velocity,and then feeds back to the various stages of the casting machine to realize accurate and efficient casting of the nickel anode.By introducing the structural composition of the linear casting machine,it is analyzed that the linear casting machine has the problems of high positioning requirements and inconsistent wear degrees.For the problem of positioning,the multi-turn absolute encoder is selected as the position feedback component,and the three closed-loop control scheme and the position loop and speed loop controller are designed to realize the action control of the linear casting machine.Based on the design process,the hardware structure of the nickel anode quantitative casting equipment was designed.The industrial computer is used as the upper computer monitoring system,and Siemens PLC and SIMOTION are used as the lower computer control system.The Siemens PLC and SIMOTION are selected,the input and output points of each module are allocated,and the circuit schematic between each module is designed.Based on the design of the process and hardware structure,a software system for quantitative casting of nickel anode was developed,which mainly consisted of two parts:upper computer and lower computer.The upper computer is composed of an industrial computer and a touch screen,to displays the running status of the device.They running interface,printout interface,historical data interface,monitoring operation interface,and the like.The lower computer consists of PLC and SIMOTION.The PLC software implements the logic control and internal algorithm processing of the device.SIMOTION is the core of the servo drive and is used to control the rotation of the servo motor.A large number of experiments were carried out,including casting water simulation experiments and casting of nickel anode plates,and optimization of system hardware and software through debugging.After continuous debugging,the equipment finally meets the design requirements.Through the later data,the equipment shows the advantages of good system stability,high control precision and stable casting weight.