Study And Design Of Production Line’s Control System Of Spinning Process On UHMWPE Fiber

At present, the domestic production of UHMWPE fiber, due to the inefficiency of the Gel Spinning process itself, and the equipments, control scheme are relatively backward, the yield and quality of the finished products are not very good. And the volatile solvents in the process are not only too difficulties to deal with, but also can easy to cause environmental pollution. The UHMWPE fiber production line that involved in this paper, which is first using the melt spinning method at home and abroad, with the most advanced technology of extrusion process, is a good chance to improve the technological level and production efficiency, and also to avoid the environmental risks. At the same time, it also put forward higher requirements to the equipments and control scheme of the production line, which must be in proper temperature condition, a stable and reliable multi axis synchronous operation control. Research on this has theoretical significance and actual application value.This paper makes a detailed analysis on the production line of UHMWPE fiber spinning process firstly, summarizes the control demand of the production line’s control system. Considering the precision of multi axis synchronous motion, and the high requirement on the speed of data transmission and processing when movement and feedback process, it designs a PROFIBUS communication network, that connects to PCC as the main node, connects to Danfoss inverter as the control system’ slave node, which drives an AC permanent magnet synchronous motor. So it not only improves the speed of data transmission and control performance, but also reduces the total cost.In addition, this paper analyzes the composition of the actual control system, describes the design and realization methods of control system. In accordance with designed plan of the control system, reasonable arrangement and installation and validation of equipment, modules, circuit are completed; software configuration and programs of the control system are also achieved. All those make the wish to be true that the main controller PCC take charge of all the control parts, including the four grade drafting devices, which composed a multi axis synchronous motion system, and two heating boxes with their electric valve that composed a temperature control part. Programs of the control system complete the exchange, storage, transmission processes of the communication signals and data, and provide interactive operation on a human machine interface, provide the whole running state of production line.A mathematical model of the temperature control system and heat transfer model of fiber when they are in the heating box are constructed. On the analysis of the model results shows that, the outputs of temperature controller response quickly to the changes of input and achieve to the changed value stability. The whole effect of heat transfer model can also maintain the temperature of fiber at export in the range of 5 degrees Celsius with random disturbance. Then modeling the heating box and the controller with the neural network methods, and compared with the traditional PID control algorithm, simulation outputs of the PID neural network model shows that, the improved model response to changes with shorter time and more stable.At last, through actual data acquisition, and result show that, both movement error of the main axis itself, and of the slave axes that following the main axis with synchronous motion, cause the error of UHMWPE fiber’s diameter to be far less than 0.05, which is the requirement.